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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2410.20559">arXiv:2410.20559</a> <span> [<a href="https://arxiv.org/pdf/2410.20559">pdf</a>, <a href="https://arxiv.org/format/2410.20559">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the response function of the PIENU calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aguilar-Arevalo%2C+A">A. Aguilar-Arevalo</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+M">M. Aoki</a>, <a href="/search/physics?searchtype=author&query=Blecher%2C+M">M. Blecher</a>, <a href="/search/physics?searchtype=author&query=Britton%2C+D+I">D. I. Britton</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D+A">D. A. Bryman</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=Gumplinger%2C+P">P. Gumplinger</a>, <a href="/search/physics?searchtype=author&query=Hernandez%2C+I">I. Hernandez</a>, <a href="/search/physics?searchtype=author&query=Hussein%2C+A">A. Hussein</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Littenberg%2C+L">L. Littenberg</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Mischke%2C+R+E">R. E. Mischke</a>, <a href="/search/physics?searchtype=author&query=Numao%2C+T">T. Numao</a>, <a href="/search/physics?searchtype=author&query=Protopopescu%2C+D">D. Protopopescu</a>, <a href="/search/physics?searchtype=author&query=Sher%2C+A">A. Sher</a>, <a href="/search/physics?searchtype=author&query=Sullivan%2C+T">T. Sullivan</a>, <a href="/search/physics?searchtype=author&query=Vavilov%2C+D">D. Vavilov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2410.20559v1-abstract-short" style="display: inline;"> Measurements of the response function of the PIENU NaI(T$\ell$) and CsI crystal calorimeter using a monochromatic 70 MeV/c positron beam at various incidence angles are described. The experimental setup and relevant physical processes involved were simulated using Geant4 to reproduce positron energy spectra. Monte Carlo simulations were compared with experimental data across ten calorimeter-beam a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.20559v1-abstract-full').style.display = 'inline'; document.getElementById('2410.20559v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.20559v1-abstract-full" style="display: none;"> Measurements of the response function of the PIENU NaI(T$\ell$) and CsI crystal calorimeter using a monochromatic 70 MeV/c positron beam at various incidence angles are described. The experimental setup and relevant physical processes involved were simulated using Geant4 to reproduce positron energy spectra. Monte Carlo simulations were compared with experimental data across ten calorimeter-beam angles and showed good agreement. This allowed the validation of simulation parameters that were essential for precise measurements of pion decays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.20559v1-abstract-full').style.display = 'none'; document.getElementById('2410.20559v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2211.09838">arXiv:2211.09838</a> <span> [<a href="https://arxiv.org/pdf/2211.09838">pdf</a>, <a href="https://arxiv.org/format/2211.09838">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevAccelBeams.26.040101">10.1103/PhysRevAccelBeams.26.040101 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design and Performance of a Novel Low Energy Multi-Species Beamline for the ALPHA Antihydrogen Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baker%2C+C+J">C. J. Baker</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Capra%2C+A">A. Capra</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Christensen%2C+A+J">A. J. Christensen</a>, <a href="/search/physics?searchtype=author&query=Collister%2C+R">R. Collister</a>, <a href="/search/physics?searchtype=author&query=Mathad%2C+A+C">A. Cridland Mathad</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</a>, <a href="/search/physics?searchtype=author&query=Evans%2C+A">A. Evans</a>, <a href="/search/physics?searchtype=author&query=Evetts%2C+N">N. Evetts</a>, <a href="/search/physics?searchtype=author&query=Fabbri%2C+S">S. Fabbri</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Grandemange%2C+P">P. Grandemange</a>, <a href="/search/physics?searchtype=author&query=Granum%2C+P">P. Granum</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Hodgkinson%2C+D">D. Hodgkinson</a>, <a href="/search/physics?searchtype=author&query=Isaac%2C+C+A">C. A. Isaac</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+M+A">M. A. Johnson</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+J+M">J. M. Jones</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+S+A">S. A. Jones</a> , et al. (25 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2211.09838v1-abstract-short" style="display: inline;"> The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. Using… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09838v1-abstract-full').style.display = 'inline'; document.getElementById('2211.09838v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2211.09838v1-abstract-full" style="display: none;"> The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low-energy ($\lesssim$ 100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how a combination of semianalytical and numerical calculations were used to optimise the layout and design of this beamline. Using experimental measurements taken during the initial commissioning of the instrument, we evaluate its performance and validate the models used for its development. By combining data from a range of sources, we show that the beamline has a high transfer efficiency, and estimate that the percentage of particles captured in the experiments from each bunch is (78 $\pm$ 3)% for up to $10^{5}$ antiprotons, and (71 $\pm$ 5)% for bunches of up to $10^{7}$ positrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2211.09838v1-abstract-full').style.display = 'none'; document.getElementById('2211.09838v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 November, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 15 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2210.16232">arXiv:2210.16232</a> <span> [<a href="https://arxiv.org/pdf/2210.16232">pdf</a>, <a href="https://arxiv.org/format/2210.16232">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2023.168764">10.1016/j.nima.2023.168764 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> NA62 Liquid Krypton Purity Monitor </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bremer%2C+J">Johan Bremer</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">Douglas Bryman</a>, <a href="/search/physics?searchtype=author&query=Danielsson%2C+H">Hans Danielsson</a>, <a href="/search/physics?searchtype=author&query=Falaleev%2C+V">Valeri Falaleev</a>, <a href="/search/physics?searchtype=author&query=Koettig%2C+T">Torsten Koettig</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Leonid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Liberadzka-Porret%2C+J">Joanna Liberadzka-Porret</a>, <a href="/search/physics?searchtype=author&query=Onufrena%2C+A">Aleksandra Onufrena</a>, <a href="/search/physics?searchtype=author&query=Velghe%2C+B">Bob Velghe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2210.16232v2-abstract-short" style="display: inline;"> A system for determining the purity of liquid krypton employed in the NA62 rare kaon decay experiment at CERN was developed based on the use of a time projection chamber. The attenuation of drifting ionization electrons from absorption of 511 keV gamma rays in liquid krypton was measured to estimate the purity. The setup was tested with krypton purified from commercial sources. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2210.16232v2-abstract-full" style="display: none;"> A system for determining the purity of liquid krypton employed in the NA62 rare kaon decay experiment at CERN was developed based on the use of a time projection chamber. The attenuation of drifting ionization electrons from absorption of 511 keV gamma rays in liquid krypton was measured to estimate the purity. The setup was tested with krypton purified from commercial sources. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2210.16232v2-abstract-full').style.display = 'none'; document.getElementById('2210.16232v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2202.07384">arXiv:2202.07384</a> <span> [<a href="https://arxiv.org/pdf/2202.07384">pdf</a>, <a href="https://arxiv.org/format/2202.07384">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/17/05/P05024">10.1088/1748-0221/17/05/P05024 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Phase-I Trigger Readout Electronics Upgrade of the ATLAS Liquid Argon Calorimeters </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aad%2C+G">G. Aad</a>, <a href="/search/physics?searchtype=author&query=Akimov%2C+A+V">A. V. Akimov</a>, <a href="/search/physics?searchtype=author&query=Khoury%2C+K+A">K. Al Khoury</a>, <a href="/search/physics?searchtype=author&query=Aleksa%2C+M">M. Aleksa</a>, <a href="/search/physics?searchtype=author&query=Andeen%2C+T">T. Andeen</a>, <a href="/search/physics?searchtype=author&query=Anelli%2C+C">C. Anelli</a>, <a href="/search/physics?searchtype=author&query=Aranzabal%2C+N">N. Aranzabal</a>, <a href="/search/physics?searchtype=author&query=Armijo%2C+C">C. Armijo</a>, <a href="/search/physics?searchtype=author&query=Bagulia%2C+A">A. Bagulia</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+J">J. Ban</a>, <a href="/search/physics?searchtype=author&query=Barillari%2C+T">T. Barillari</a>, <a href="/search/physics?searchtype=author&query=Bellachia%2C+F">F. Bellachia</a>, <a href="/search/physics?searchtype=author&query=Benoit%2C+M">M. Benoit</a>, <a href="/search/physics?searchtype=author&query=Bernon%2C+F">F. Bernon</a>, <a href="/search/physics?searchtype=author&query=Berthold%2C+A">A. Berthold</a>, <a href="/search/physics?searchtype=author&query=Bervas%2C+H">H. Bervas</a>, <a href="/search/physics?searchtype=author&query=Besin%2C+D">D. Besin</a>, <a href="/search/physics?searchtype=author&query=Betti%2C+A">A. Betti</a>, <a href="/search/physics?searchtype=author&query=Bianga%2C+Y">Y. Bianga</a>, <a href="/search/physics?searchtype=author&query=Biaut%2C+M">M. Biaut</a>, <a href="/search/physics?searchtype=author&query=Boline%2C+D">D. Boline</a>, <a href="/search/physics?searchtype=author&query=Boudreau%2C+J">J. Boudreau</a>, <a href="/search/physics?searchtype=author&query=Bouedo%2C+T">T. Bouedo</a>, <a href="/search/physics?searchtype=author&query=Braam%2C+N">N. Braam</a>, <a href="/search/physics?searchtype=author&query=Bret%2C+M+C">M. Cano Bret</a> , et al. (173 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2202.07384v2-abstract-short" style="display: inline;"> The Phase-I trigger readout electronics upgrade of the ATLAS Liquid Argon calorimeters enhances the physics reach of the experiment during the upcoming operation at increasing Large Hadron Collider luminosities. The new system, installed during the second Large Hadron Collider Long Shutdown, increases the trigger readout granularity by up to a factor of ten as well as its precision and range. Cons… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.07384v2-abstract-full').style.display = 'inline'; document.getElementById('2202.07384v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2202.07384v2-abstract-full" style="display: none;"> The Phase-I trigger readout electronics upgrade of the ATLAS Liquid Argon calorimeters enhances the physics reach of the experiment during the upcoming operation at increasing Large Hadron Collider luminosities. The new system, installed during the second Large Hadron Collider Long Shutdown, increases the trigger readout granularity by up to a factor of ten as well as its precision and range. Consequently, the background rejection at trigger level is improved through enhanced filtering algorithms utilizing the additional information for topological discrimination of electromagnetic and hadronic shower shapes. This paper presents the final designs of the new electronic elements, their custom electronic devices, the procedures used to validate their proper functioning, and the performance achieved during the commissioning of this system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2202.07384v2-abstract-full').style.display = 'none'; document.getElementById('2202.07384v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 February, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">56 pages, 41 figures, 6 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> 2022 JINST 17 P05024 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2109.05124">arXiv:2109.05124</a> <span> [<a href="https://arxiv.org/pdf/2109.05124">pdf</a>, <a href="https://arxiv.org/format/2109.05124">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/17/01/P01002">10.1088/1748-0221/17/01/P01002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Energy reconstruction in a liquid argon calorimeter cell using convolutional neural networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Polson%2C+L">L. Polson</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lefebvre%2C+M">M. Lefebvre</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2109.05124v2-abstract-short" style="display: inline;"> The liquid argon ionization current in a sampling calorimeter cell can be analyzed to determine the energy of detected particles. In practice, experimental artifacts such as pileup and electronic noise make the inference of energy from current a difficult process. The beam intensity of the Large Hadron Collider will be significantly increased during the Phase-II long shut down of 2025-2027. Signal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.05124v2-abstract-full').style.display = 'inline'; document.getElementById('2109.05124v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2109.05124v2-abstract-full" style="display: none;"> The liquid argon ionization current in a sampling calorimeter cell can be analyzed to determine the energy of detected particles. In practice, experimental artifacts such as pileup and electronic noise make the inference of energy from current a difficult process. The beam intensity of the Large Hadron Collider will be significantly increased during the Phase-II long shut down of 2025-2027. Signal processing techniques that are used to extract the energy of detected particles in the ATLAS detector will suffer a significant loss in performance under these conditions. This paper compares the presently used optimal filter technique to convolutional neural networks for energy reconstruction in the ATLAS liquid argon hadronic end cap calorimeter. In particular, it is shown that convolutional neural networks trained with an appropriately tuned and novel loss function are able to outperform the optimal filter technique. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2109.05124v2-abstract-full').style.display = 'none'; document.getElementById('2109.05124v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 10 figures, clarifications to Sections 3 and 4, added references, improved Conclusion</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.08152">arXiv:2107.08152</a> <span> [<a href="https://arxiv.org/pdf/2107.08152">pdf</a>, <a href="https://arxiv.org/format/2107.08152">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-016-1382-6">10.1007/s10751-016-1382-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limit on the Electric Charge of Antihydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Capra%2C+A">A. Capra</a>, <a href="/search/physics?searchtype=author&query=Amole%2C+C">C. Amole</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Gutierrez%2C+A">A. Gutierrez</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Isaac%2C+C+A">C. A. Isaac</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L+.">L . Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Little%2C+A">A. Little</a>, <a href="/search/physics?searchtype=author&query=McKenna%2C+J+T+K">J. T. K. McKenna</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a>, <a href="/search/physics?searchtype=author&query=Napoli%2C+S+C">S. C. Napoli</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a> , et al. (15 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.08152v1-abstract-short" style="display: inline;"> The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. Charge neutrality of matter is known to a very high precision, hence a neutrality limit of $\overline{\mathrm{H}}$ provides a test of CPT invarianc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.08152v1-abstract-full').style.display = 'inline'; document.getElementById('2107.08152v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.08152v1-abstract-full" style="display: none;"> The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, $\overline{\mathrm{H}}$. An analysis of trapping data allowed a stringent limit to be placed on the electric charge of the simplest antiatom. Charge neutrality of matter is known to a very high precision, hence a neutrality limit of $\overline{\mathrm{H}}$ provides a test of CPT invariance. The experimental technique is based on the measurement of the deflection of putatively charged $\overline{\mathrm{H}}$ in an electric field. The tendency for trapped $\overline{\mathrm{H}}$ atoms to be displaced by electrostatic fields is measured and compared to the results of a detailed simulation of $\overline{\mathrm{H}}$ dynamics in the trap. An extensive survey of the systematic errors is performed, with particular attention to those due to the silicon vertex detector, which is the device used to determine the $\overline{\mathrm{H}}$ annihilation position. The limit obtained on the charge of the $\overline{\mathrm{H}}$ atom is \mbox{$ Q = (-1.3\pm1.8\pm0.4)\times10^{-8}$}, representing the first precision measurement with $\overline{\mathrm{H}}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.08152v1-abstract-full').style.display = 'none'; document.getElementById('2107.08152v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Hyperfine Interact 238, 9 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.08857">arXiv:1905.08857</a> <span> [<a href="https://arxiv.org/pdf/1905.08857">pdf</a>, <a href="https://arxiv.org/format/1905.08857">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevAccelBeams.22.102401">10.1103/PhysRevAccelBeams.22.102401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A fast-switching magnet serving a spallation-driven ultracold neutron source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ahmed%2C+S">S. Ahmed</a>, <a href="/search/physics?searchtype=author&query=Altiere%2C+E">E. Altiere</a>, <a href="/search/physics?searchtype=author&query=Andalib%2C+T">T. Andalib</a>, <a href="/search/physics?searchtype=author&query=Barnes%2C+M+J">M. J. Barnes</a>, <a href="/search/physics?searchtype=author&query=Bell%2C+B">B. Bell</a>, <a href="/search/physics?searchtype=author&query=Bidinosti%2C+C+P">C. P. Bidinosti</a>, <a href="/search/physics?searchtype=author&query=Bylinsky%2C+Y">Y. Bylinsky</a>, <a href="/search/physics?searchtype=author&query=Chak%2C+J">J. Chak</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/physics?searchtype=author&query=Fischer%2C+F">F. Fischer</a>, <a href="/search/physics?searchtype=author&query=Franke%2C+B">B. Franke</a>, <a href="/search/physics?searchtype=author&query=Gericke%2C+M+T+W">M. T. W. Gericke</a>, <a href="/search/physics?searchtype=author&query=Giampa%2C+P">P. Giampa</a>, <a href="/search/physics?searchtype=author&query=Hahn%2C+M">M. Hahn</a>, <a href="/search/physics?searchtype=author&query=Hansen-Romu%2C+S">S. Hansen-Romu</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">K. Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Hayamizu%2C+T">T. Hayamizu</a>, <a href="/search/physics?searchtype=author&query=Jamieson%2C+B">B. Jamieson</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+D">D. Jones</a>, <a href="/search/physics?searchtype=author&query=Katsika%2C+K">K. Katsika</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">S. Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Kikawa%2C+T">T. Kikawa</a>, <a href="/search/physics?searchtype=author&query=Klassen%2C+W">W. Klassen</a>, <a href="/search/physics?searchtype=author&query=Konaka%2C+A">A. Konaka</a> , et al. (25 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.08857v2-abstract-short" style="display: inline;"> A fast-switching, high-repetition-rate magnet and power supply have been developed for and operated at TRIUMF, to deliver a proton beam to the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: a time-averaged beam current of 40~$渭$A with the ability to switch the beam on or off for several minutes. These requirements are in conflict with the typical oper… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.08857v2-abstract-full').style.display = 'inline'; document.getElementById('1905.08857v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.08857v2-abstract-full" style="display: none;"> A fast-switching, high-repetition-rate magnet and power supply have been developed for and operated at TRIUMF, to deliver a proton beam to the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: a time-averaged beam current of 40~$渭$A with the ability to switch the beam on or off for several minutes. These requirements are in conflict with the typical operation mode of the TRIUMF cyclotron which delivers nearly continuous beam to multiple users. To enable the creation of the UCN facility, a beam-sharing arrangement with another facility was made. The beam sharing is accomplished by the fast-switching (kicker) magnet which is ramped in 50~$渭$s to a current of 193~A, held there for approximately 1~ms, then ramped down in the same short period of time. This achieves a 12~mrad deflection which is sufficient to switch the proton beam between the two facilities. The kicker magnet relies on a high-current, low-inductance coil connected to a fast-switching power supply that is based on insulated-gate bipolar transistors (IGBTs). The design and performance of the kicker magnet system and initial beam delivery results are reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.08857v2-abstract-full').style.display = 'none'; document.getElementById('1905.08857v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 August, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 21 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.01001">arXiv:1810.01001</a> <span> [<a href="https://arxiv.org/pdf/1810.01001">pdf</a>, <a href="https://arxiv.org/format/1810.01001">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2019.01.074">10.1016/j.nima.2019.01.074 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A beamline for fundamental neutron physics at TRIUMF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ahmed%2C+S">S. Ahmed</a>, <a href="/search/physics?searchtype=author&query=Andalib%2C+T">T. Andalib</a>, <a href="/search/physics?searchtype=author&query=Barnes%2C+M+J">M. J. Barnes</a>, <a href="/search/physics?searchtype=author&query=Bidinosti%2C+C+B">C. B. Bidinosti</a>, <a href="/search/physics?searchtype=author&query=Bylinsky%2C+Y">Y. Bylinsky</a>, <a href="/search/physics?searchtype=author&query=Chak%2C+J">J. Chak</a>, <a href="/search/physics?searchtype=author&query=Das%2C+M">M. Das</a>, <a href="/search/physics?searchtype=author&query=Davis%2C+C+A">C. A. Davis</a>, <a href="/search/physics?searchtype=author&query=Franke%2C+B">B. Franke</a>, <a href="/search/physics?searchtype=author&query=Gericke%2C+M+T+W">M. T. W. Gericke</a>, <a href="/search/physics?searchtype=author&query=Giampa%2C+P">P. Giampa</a>, <a href="/search/physics?searchtype=author&query=Hahn%2C+M">M. Hahn</a>, <a href="/search/physics?searchtype=author&query=Hansen-Romu%2C+S">S. Hansen-Romu</a>, <a href="/search/physics?searchtype=author&query=Hatanaka%2C+K">K. Hatanaka</a>, <a href="/search/physics?searchtype=author&query=Jamieson%2C+B">B. Jamieson</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+D">D. Jones</a>, <a href="/search/physics?searchtype=author&query=Katsika%2C+K">K. Katsika</a>, <a href="/search/physics?searchtype=author&query=Kawasaki%2C+S">S. Kawasaki</a>, <a href="/search/physics?searchtype=author&query=Klassen%2C+W">W. Klassen</a>, <a href="/search/physics?searchtype=author&query=Konaka%2C+A">A. Konaka</a>, <a href="/search/physics?searchtype=author&query=Korkmaz%2C+E">E. Korkmaz</a>, <a href="/search/physics?searchtype=author&query=Kuchler%2C+F">F. Kuchler</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lang%2C+M">M. Lang</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+L">L. Lee</a> , et al. (22 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1810.01001v2-abstract-short" style="display: inline;"> This article describes the new primary proton beamline 1U at TRIUMF. The purpose of this beamline is to produce ultracold neutrons (UCN) for fundamental-physics experiments. It delivers up to 40 microA of 480 MeV protons from the TRIUMF cyclotron to a tungsten spallation target and uses a fast kicker to share the beam between the Center for Molecular and Materials Science and UCN. The beamline has… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.01001v2-abstract-full').style.display = 'inline'; document.getElementById('1810.01001v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.01001v2-abstract-full" style="display: none;"> This article describes the new primary proton beamline 1U at TRIUMF. The purpose of this beamline is to produce ultracold neutrons (UCN) for fundamental-physics experiments. It delivers up to 40 microA of 480 MeV protons from the TRIUMF cyclotron to a tungsten spallation target and uses a fast kicker to share the beam between the Center for Molecular and Materials Science and UCN. The beamline has been successfully commissioned and operated with a beam current up to 10 microA, facilitating first large-scale UCN production in Canada. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.01001v2-abstract-full').style.display = 'none'; document.getElementById('1810.01001v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.03683">arXiv:1808.03683</a> <span> [<a href="https://arxiv.org/pdf/1808.03683">pdf</a>, <a href="https://arxiv.org/format/1808.03683">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2018.07.064">10.1016/j.nima.2018.07.064 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In-beam internal conversion electron spectroscopy with the SPICE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Moukaddam%2C+M">M. Moukaddam</a>, <a href="/search/physics?searchtype=author&query=Smallcombe%2C+J">J. Smallcombe</a>, <a href="/search/physics?searchtype=author&query=Evitts%2C+L+J">L. J. Evitts</a>, <a href="/search/physics?searchtype=author&query=Garnsworthy%2C+A+B">A. B. Garnsworthy</a>, <a href="/search/physics?searchtype=author&query=Andreoiu%2C+C">C. Andreoiu</a>, <a href="/search/physics?searchtype=author&query=Ball%2C+G+C">G. C. Ball</a>, <a href="/search/physics?searchtype=author&query=Berean-Dutcher%2C+J">J. Berean-Dutcher</a>, <a href="/search/physics?searchtype=author&query=Bishop%2C+D">D. Bishop</a>, <a href="/search/physics?searchtype=author&query=Bolton%2C+C">C. Bolton</a>, <a href="/search/physics?searchtype=author&query=Caballero-Folch%2C+R">R. Caballero-Folch</a>, <a href="/search/physics?searchtype=author&query=Constable%2C+M">M. Constable</a>, <a href="/search/physics?searchtype=author&query=Cross%2C+D+S">D. S. Cross</a>, <a href="/search/physics?searchtype=author&query=Drake%2C+T+E">T. E. Drake</a>, <a href="/search/physics?searchtype=author&query=Dunlop%2C+R">R. Dunlop</a>, <a href="/search/physics?searchtype=author&query=Garrett%2C+P+E">P. E. Garrett</a>, <a href="/search/physics?searchtype=author&query=Georges%2C+S">S. Georges</a>, <a href="/search/physics?searchtype=author&query=Hackman%2C+G">G. Hackman</a>, <a href="/search/physics?searchtype=author&query=Hallam%2C+S">S. Hallam</a>, <a href="/search/physics?searchtype=author&query=Henderson%2C+J">J. Henderson</a>, <a href="/search/physics?searchtype=author&query=Henderson%2C+R">R. Henderson</a>, <a href="/search/physics?searchtype=author&query=Kr%C3%BCcken%2C+R">R. Kr眉cken</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Kurkjian%2C+A">A. Kurkjian</a>, <a href="/search/physics?searchtype=author&query=Olaizola%2C+B">B. Olaizola</a>, <a href="/search/physics?searchtype=author&query=O%27Sullivan%2C+E">E. O'Sullivan</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1808.03683v1-abstract-short" style="display: inline;"> The SPectrometer for Internal Conversion Electrons (SPICE) has been commissioned for use in conjunction with the TIGRESS $纬$-ray spectrometer at TRIUMF's ISAC-II facility. SPICE features a permanent rare-earth magnetic lens to collect and direct internal conversion electrons emitted from nuclear reactions to a thick, highly segmented, lithium-drifted silicon detector. This arrangement, combined wi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.03683v1-abstract-full').style.display = 'inline'; document.getElementById('1808.03683v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.03683v1-abstract-full" style="display: none;"> The SPectrometer for Internal Conversion Electrons (SPICE) has been commissioned for use in conjunction with the TIGRESS $纬$-ray spectrometer at TRIUMF's ISAC-II facility. SPICE features a permanent rare-earth magnetic lens to collect and direct internal conversion electrons emitted from nuclear reactions to a thick, highly segmented, lithium-drifted silicon detector. This arrangement, combined with TIGRESS, enables in-beam $纬$-ray and internal conversion electron spectroscopy to be performed with stable and radioactive ion beams. Technical aspects of the device, capabilities, and initial performance are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.03683v1-abstract-full').style.display = 'none'; document.getElementById('1808.03683v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1610.06083">arXiv:1610.06083</a> <span> [<a href="https://arxiv.org/pdf/1610.06083">pdf</a>, <a href="https://arxiv.org/format/1610.06083">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2017.01.026">10.1016/j.physletb.2017.01.026 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A novel comparison of M酶ller and Compton electron-beam polarimeters </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Magee%2C+J+A">J. A. Magee</a>, <a href="/search/physics?searchtype=author&query=Narayan%2C+A">A. Narayan</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+D">D. Jones</a>, <a href="/search/physics?searchtype=author&query=Beminiwattha%2C+R">R. Beminiwattha</a>, <a href="/search/physics?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/physics?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/physics?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/physics?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/physics?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/physics?searchtype=author&query=Martin%2C+J+W">J. W. Martin</a>, <a href="/search/physics?searchtype=author&query=Paschke%2C+K+D">K. D. Paschke</a>, <a href="/search/physics?searchtype=author&query=Tvaskis%2C+V">V. Tvaskis</a>, <a href="/search/physics?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/physics?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/physics?searchtype=author&query=Cates%2C+G">G. Cates</a>, <a href="/search/physics?searchtype=author&query=Cavness%2C+B+S">B. S. Cavness</a>, <a href="/search/physics?searchtype=author&query=Dillon-Townes%2C+L+A">L. A. Dillon-Townes</a>, <a href="/search/physics?searchtype=author&query=Hays%2C+G">G. Hays</a>, <a href="/search/physics?searchtype=author&query=Hoskins%2C+J">J. Hoskins</a>, <a href="/search/physics?searchtype=author&query=Ihloff%2C+E">E. Ihloff</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+R">R. Jones</a>, <a href="/search/physics?searchtype=author&query=King%2C+P+M">P. M. King</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+S">S. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+L">L. Lee</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1610.06083v2-abstract-short" style="display: inline;"> We have performed a novel comparison between electron-beam polarimeters based on M酶ller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents ($<$ 5 $渭$A) during the $Q_{\rm weak}$ experiment in Hall C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 $渭$A) operation of the Compton polarimete… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06083v2-abstract-full').style.display = 'inline'; document.getElementById('1610.06083v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1610.06083v2-abstract-full" style="display: none;"> We have performed a novel comparison between electron-beam polarimeters based on M酶ller and Compton scattering. A sequence of electron-beam polarization measurements were performed at low beam currents ($<$ 5 $渭$A) during the $Q_{\rm weak}$ experiment in Hall C at Jefferson Lab. These low current measurements were bracketed by the regular high current (180 $渭$A) operation of the Compton polarimeter. All measurements were found to be consistent within experimental uncertainties of 1% or less, demonstrating that electron polarization does not depend significantly on the beam current. This result lends confidence to the common practice of applying M酶ller measurements made at low beam currents to physics experiments performed at higher beam currents. The agreement between two polarimetry techniques based on independent physical processes sets an important benchmark for future precision asymmetry measurements that require sub-1% precision in polarimetry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1610.06083v2-abstract-full').style.display = 'none'; document.getElementById('1610.06083v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 January, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 October, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.06656">arXiv:1609.06656</a> <span> [<a href="https://arxiv.org/pdf/1609.06656">pdf</a>, <a href="https://arxiv.org/format/1609.06656">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Design of a Radial TPC for Antihydrogen Gravity Measurement with ALPHA-g </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Capra%2C+A">Andrea Capra</a>, <a href="/search/physics?searchtype=author&query=Amaudruz%2C+P">Pierre-Andr茅 Amaudruz</a>, <a href="/search/physics?searchtype=author&query=Bishop%2C+D">Daryl Bishop</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Freeman%2C+S">Skyler Freeman</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D">David Gill</a>, <a href="/search/physics?searchtype=author&query=Grant%2C+M">Matthew Grant</a>, <a href="/search/physics?searchtype=author&query=Henderson%2C+R">Robert Henderson</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Leonid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+P">Philip Lu</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">Scott Menary</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">Konstantin Olchanski</a>, <a href="/search/physics?searchtype=author&query=Retiere%2C+F">Fabrice Retiere</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1609.06656v1-abstract-short" style="display: inline;"> The gravitational interaction of antimatter and matter has never been directly probed. ALPHA-g is a novel experiment that aims to perform the first measurement of the antihydrogen gravitational mass. A fundamental requirement for this new apparatus is a position sensitive particle detector around the antihydrogen trap which provides information about antihydrogen annihilation location. The propose… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06656v1-abstract-full').style.display = 'inline'; document.getElementById('1609.06656v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.06656v1-abstract-full" style="display: none;"> The gravitational interaction of antimatter and matter has never been directly probed. ALPHA-g is a novel experiment that aims to perform the first measurement of the antihydrogen gravitational mass. A fundamental requirement for this new apparatus is a position sensitive particle detector around the antihydrogen trap which provides information about antihydrogen annihilation location. The proposed detector is a radial Time Projection Chamber, or \textit{rTPC}, whose concept is being developed at TRIUMF. A simulation of the detector and the development of the reconstruction software, used to determine the antihydrogen annihilation point, is presented alongside with the expected performance of the rTPC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06656v1-abstract-full').style.display = 'none'; document.getElementById('1609.06656v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures, LEAP2016</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.08437">arXiv:1509.08437</a> <span> [<a href="https://arxiv.org/pdf/1509.08437">pdf</a>, <a href="https://arxiv.org/ps/1509.08437">ps</a>, <a href="https://arxiv.org/format/1509.08437">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Status of the TRIUMF PIENU Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</a>, <a href="/search/physics?searchtype=author&query=Aguilar-Arevalo%2C+A">A. Aguilar-Arevalo</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+M">M. Aoki</a>, <a href="/search/physics?searchtype=author&query=Blecher%2C+M">M. Blecher</a>, <a href="/search/physics?searchtype=author&query=Britton%2C+D+I">D. I. Britton</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D+A">D. A. Bryman</a>, <a href="/search/physics?searchtype=author&query=Bruch%2C+D+v">D. vom Bruch</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S">S. Chen</a>, <a href="/search/physics?searchtype=author&query=Comfort%2C+J">J. Comfort</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gumplinger%2C+P">P. Gumplinger</a>, <a href="/search/physics?searchtype=author&query=Hussein%2C+A">A. Hussein</a>, <a href="/search/physics?searchtype=author&query=Igarashi%2C+Y">Y. Igarashi</a>, <a href="/search/physics?searchtype=author&query=Kettell%2C+S">S. Kettell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Littenberg%2C+L">L. Littenberg</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Mischke%2C+R+E">R. E. Mischke</a>, <a href="/search/physics?searchtype=author&query=Numao%2C+T">T. Numao</a>, <a href="/search/physics?searchtype=author&query=Protopopescu%2C+D">D. Protopopescu</a>, <a href="/search/physics?searchtype=author&query=Sher%2C+A">A. Sher</a>, <a href="/search/physics?searchtype=author&query=Sullivan%2C+T">T. Sullivan</a>, <a href="/search/physics?searchtype=author&query=Vavilov%2C+D">D. Vavilov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1509.08437v3-abstract-short" style="display: inline;"> The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio $R=螕(蟺^+{\rightarrow}e^+谓_e(纬))/螕(蟺^+{\rightarrow}渭^+谓_渭(纬))$ with precision $<0.1$% to provide a sensitive test of electron-muon universality in weak interactions. The current status of the PIENU experiment is presented. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.08437v3-abstract-full" style="display: none;"> The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio $R=螕(蟺^+{\rightarrow}e^+谓_e(纬))/螕(蟺^+{\rightarrow}渭^+谓_渭(纬))$ with precision $<0.1$% to provide a sensitive test of electron-muon universality in weak interactions. The current status of the PIENU experiment is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.08437v3-abstract-full').style.display = 'none'; document.getElementById('1509.08437v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Talk presented CIPANP2015. 8 pages, LaTeX, 4 eps figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CIPANP2015_Ito </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.06642">arXiv:1509.06642</a> <span> [<a href="https://arxiv.org/pdf/1509.06642">pdf</a>, <a href="https://arxiv.org/format/1509.06642">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevX.6.011013">10.1103/PhysRevX.6.011013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precision Electron-Beam Polarimetry using Compton Scattering at 1 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Narayan%2C+A">A. Narayan</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+D">D. Jones</a>, <a href="/search/physics?searchtype=author&query=Cornejo%2C+J+C">J. C. Cornejo</a>, <a href="/search/physics?searchtype=author&query=Dalton%2C+M+M">M. M. Dalton</a>, <a href="/search/physics?searchtype=author&query=Deconinck%2C+W">W. Deconinck</a>, <a href="/search/physics?searchtype=author&query=Dutta%2C+D">D. Dutta</a>, <a href="/search/physics?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/physics?searchtype=author&query=Martin%2C+J+W">J. W. Martin</a>, <a href="/search/physics?searchtype=author&query=Paschke%2C+K+D">K. D. Paschke</a>, <a href="/search/physics?searchtype=author&query=Tvaskis%2C+V">V. Tvaskis</a>, <a href="/search/physics?searchtype=author&query=Asaturyan%2C+A">A. Asaturyan</a>, <a href="/search/physics?searchtype=author&query=Benesch%2C+J">J. Benesch</a>, <a href="/search/physics?searchtype=author&query=Cates%2C+G">G. Cates</a>, <a href="/search/physics?searchtype=author&query=Cavness%2C+B+S">B. S. Cavness</a>, <a href="/search/physics?searchtype=author&query=Dillon-Townes%2C+L+A">L. A. Dillon-Townes</a>, <a href="/search/physics?searchtype=author&query=Hays%2C+G">G. Hays</a>, <a href="/search/physics?searchtype=author&query=Ihloff%2C+E">E. Ihloff</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+R">R. Jones</a>, <a href="/search/physics?searchtype=author&query=Kowalski%2C+S">S. Kowalski</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+L">L. Lee</a>, <a href="/search/physics?searchtype=author&query=McCreary%2C+A">A. McCreary</a>, <a href="/search/physics?searchtype=author&query=McDonald%2C+M">M. McDonald</a>, <a href="/search/physics?searchtype=author&query=Micherdzinska%2C+A">A. Micherdzinska</a>, <a href="/search/physics?searchtype=author&query=Mkrtchyan%2C+A">A. Mkrtchyan</a> , et al. (11 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1509.06642v2-abstract-short" style="display: inline;"> We report on the highest precision yet achieved in the measurement of the polarization of a low energy, $\mathcal{O}$(1 GeV), electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall~C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond micr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.06642v2-abstract-full').style.display = 'inline'; document.getElementById('1509.06642v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.06642v2-abstract-full" style="display: none;"> We report on the highest precision yet achieved in the measurement of the polarization of a low energy, $\mathcal{O}$(1 GeV), electron beam, accomplished using a new polarimeter based on electron-photon scattering, in Hall~C at Jefferson Lab. A number of technical innovations were necessary, including a novel method for precise control of the laser polarization in a cavity and a novel diamond micro-strip detector which was able to capture most of the spectrum of scattered electrons. The data analysis technique exploited track finding, the high granularity of the detector and its large acceptance. The polarization of the $180~渭$A, $1.16$~GeV electron beam was measured with a statistical precision of $<$~1\% per hour and a systematic uncertainty of 0.59\%. This exceeds the level of precision required by the \qweak experiment, a measurement of the vector weak charge of the proton. Proposed future low-energy experiments require polarization uncertainty $<$~0.4\%, and this result represents an important demonstration of that possibility. This measurement is also the first use of diamond detectors for particle tracking in an experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.06642v2-abstract-full').style.display = 'none'; document.getElementById('1509.06642v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 February, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 7 figures, published in PRX</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. X 6, 011013 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1505.02737">arXiv:1505.02737</a> <span> [<a href="https://arxiv.org/pdf/1505.02737">pdf</a>, <a href="https://arxiv.org/format/1505.02737">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2015.04.004">10.1016/j.nima.2015.04.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Detector for measuring the $蟺^+\to e^+谓_e$ branching fraction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aguilar-Arevalo%2C+A+A">A. A. Aguilar-Arevalo</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+M">M. Aoki</a>, <a href="/search/physics?searchtype=author&query=Blecher%2C+M">M. Blecher</a>, <a href="/search/physics?searchtype=author&query=Bruch%2C+D+v">D. vom Bruch</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Comfort%2C+J">J. Comfort</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gumplinger%2C+P">P. Gumplinger</a>, <a href="/search/physics?searchtype=author&query=Hussein%2C+A">A. Hussein</a>, <a href="/search/physics?searchtype=author&query=Igarashi%2C+Y">Y. Igarashi</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+N">N. Ito</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</a>, <a href="/search/physics?searchtype=author&query=Kettell%2C+S+H">S. H. Kettell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Littenberg%2C+L">L. Littenberg</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Mischke%2C+R+E">R. E. Mischke</a>, <a href="/search/physics?searchtype=author&query=Muroi%2C+A">A. Muroi</a>, <a href="/search/physics?searchtype=author&query=Numao%2C+T">T. Numao</a>, <a href="/search/physics?searchtype=author&query=Sheffer%2C+G">G. Sheffer</a>, <a href="/search/physics?searchtype=author&query=Sher%2C+A">A. Sher</a>, <a href="/search/physics?searchtype=author&query=Sullivan%2C+T">T. Sullivan</a>, <a href="/search/physics?searchtype=author&query=Tauchi%2C+K">K. Tauchi</a>, <a href="/search/physics?searchtype=author&query=Vavilov%2C+D">D. Vavilov</a> , et al. (2 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1505.02737v1-abstract-short" style="display: inline;"> The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio $R^{e/渭}$ = ${螕\big((蟺^{+} \rightarrow e^{+} 谓_{e}) + (蟺^{+} \rightarrow e^{+} 谓_{e}纬)\big)}/{螕\big((蟺^{+} \rightarrow 渭^{+} 谓_渭)+(蟺^{+} \rightarrow 渭^{+} 谓_渭纬)\big)}$ with precision $<$0.1\%. Incident pions, delivered at the rate of 60 kHz with momentum 75 MeV/c, were degraded and stopped in a plastic scintillator tar… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1505.02737v1-abstract-full').style.display = 'inline'; document.getElementById('1505.02737v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1505.02737v1-abstract-full" style="display: none;"> The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio $R^{e/渭}$ = ${螕\big((蟺^{+} \rightarrow e^{+} 谓_{e}) + (蟺^{+} \rightarrow e^{+} 谓_{e}纬)\big)}/{螕\big((蟺^{+} \rightarrow 渭^{+} 谓_渭)+(蟺^{+} \rightarrow 渭^{+} 谓_渭纬)\big)}$ with precision $<$0.1\%. Incident pions, delivered at the rate of 60 kHz with momentum 75 MeV/c, were degraded and stopped in a plastic scintillator target. Pions and their decay product positrons were detected with plastic scintillators and tracked with multiwire proportional chambers and silicon strip detectors. The energies of the positrons were measured in a spectrometer consisting of a large NaI(T$\ell$) crystal surrounded by an array of pure CsI crystals. This paper provides a description of the PIENU experimental apparatus and its performance in pursuit of $R^{e/渭}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1505.02737v1-abstract-full').style.display = 'none'; document.getElementById('1505.02737v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 May, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1405.0692">arXiv:1405.0692</a> <span> [<a href="https://arxiv.org/pdf/1405.0692">pdf</a>, <a href="https://arxiv.org/ps/1405.0692">ps</a>, <a href="https://arxiv.org/format/1405.0692">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/16/1/013037">10.1088/1367-2630/16/1/013037 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> In situ electromagnetic field diagnostics with an electron plasma in a Penning-Malmberg trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amole%2C+C">C. Amole</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Capra%2C+A">A. Capra</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Evetts%2C+N">N. Evetts</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Gutierrez%2C+A">A. Gutierrez</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Isaac%2C+C+A">C. A. Isaac</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Little%2C+A">A. Little</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=McKenna%2C+J+T+K">J. T. K. McKenna</a> , et al. (15 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1405.0692v1-abstract-short" style="display: inline;"> We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as an in situ diagnostic tool for measurement of the static magnetic field and the microwave electric field in the trap. The cyclotron motion of the electron plasma is excited by microwave radiation and the temperature chan… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.0692v1-abstract-full').style.display = 'inline'; document.getElementById('1405.0692v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1405.0692v1-abstract-full" style="display: none;"> We demonstrate a novel detection method for the cyclotron resonance frequency of an electron plasma in a Penning-Malmberg trap. With this technique, the electron plasma is used as an in situ diagnostic tool for measurement of the static magnetic field and the microwave electric field in the trap. The cyclotron motion of the electron plasma is excited by microwave radiation and the temperature change of the plasma is measured non-destructively by monitoring the plasma's quadrupole mode frequency. The spatially-resolved microwave electric field strength can be inferred from the plasma temperature change and the magnetic field is found through the cyclotron resonance frequency. These measurements were used extensively in the recently reported demonstration of resonant quantum interactions with antihydrogen. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1405.0692v1-abstract-full').style.display = 'none'; document.getElementById('1405.0692v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 May, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys. 16 013037 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.3944">arXiv:1201.3944</a> <span> [<a href="https://arxiv.org/pdf/1201.3944">pdf</a>, <a href="https://arxiv.org/format/1201.3944">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1367-2630/14/1/015010.">10.1088/1367-2630/14/1/015010. <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antihydrogen and mirror-trapped antiproton discrimination: Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amole%2C+C">C. Amole</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Gutierrez%2C+A">A. Gutierrez</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a> , et al. (13 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.3944v1-abstract-short" style="display: inline;"> Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. Once released, these antiatoms quickly hit the trap wall, whereupon the positrons and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.3944v1-abstract-full').style.display = 'inline'; document.getElementById('1201.3944v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.3944v1-abstract-full" style="display: none;"> Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. Once released, these antiatoms quickly hit the trap wall, whereupon the positrons and antiprotons in the antiatoms annihilated. The antiproton annihilations produce easily detected signals; we used these signals to prove that we trapped antihydrogen. However, our technique could be confounded by mirror-trapped antiprotons, which would produce seemingly-identical annihilation signals upon hitting the trap wall. In this paper, we discuss possible sources of mirror-trapped antiprotons and show that antihydrogen and antiprotons can be readily distinguished, often with the aid of applied electric fields, by analyzing the annihilation locations and times. We further discuss the general properties of antiproton and antihydrogen trajectories in this magnetic geometry, and reconstruct the antihydrogen energy distribution from the measured annihilation time history. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.3944v1-abstract-full').style.display = 'none'; document.getElementById('1201.3944v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J. Phys., 14 015010, 2012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.5101">arXiv:1107.5101</a> <span> [<a href="https://arxiv.org/pdf/1107.5101">pdf</a>, <a href="https://arxiv.org/ps/1107.5101">ps</a>, <a href="https://arxiv.org/format/1107.5101">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0031-9155/57/6/1685">10.1088/0031-9155/57/6/1685 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simulations of a micro-PET System based on Liquid Xenon </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Miceli%2C+A">A. Miceli</a>, <a href="/search/physics?searchtype=author&query=Glister%2C+J">J. Glister</a>, <a href="/search/physics?searchtype=author&query=Andreyev%2C+A">A. Andreyev</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+P">P. Lu</a>, <a href="/search/physics?searchtype=author&query=Muennich%2C+A">A. Muennich</a>, <a href="/search/physics?searchtype=author&query=Retiere%2C+F">F. Retiere</a>, <a href="/search/physics?searchtype=author&query=Sossi%2C+V">V. Sossi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.5101v2-abstract-short" style="display: inline;"> The imaging performance of a high-resolution preclinical microPET system employing liquid xenon as the gamma ray detection medium was simulated. The arrangement comprises a ring of detectors consisting of trapezoidal LXe time projection ionization chambers and two arrays of large area avalanche photodiodes for the measurement of ionization charge and scintillation light. A key feature of the LXePE… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.5101v2-abstract-full').style.display = 'inline'; document.getElementById('1107.5101v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.5101v2-abstract-full" style="display: none;"> The imaging performance of a high-resolution preclinical microPET system employing liquid xenon as the gamma ray detection medium was simulated. The arrangement comprises a ring of detectors consisting of trapezoidal LXe time projection ionization chambers and two arrays of large area avalanche photodiodes for the measurement of ionization charge and scintillation light. A key feature of the LXePET system is the ability to identify individual photon interactions with high energy resolution and high spatial resolution in 3 dimensions and determine the correct interaction sequence using Compton reconstruction algorithms. The simulated LXePET imaging performance was evaluated by computing the noise equivalent count rate, the sensitivity and point spread function for a point source, and by examining the image quality using a micro-Derenzo phantom according to the NEMA-NU4 standard. Results of these simulation studies included NECR peaking at 1326 kcps at 188 MBq (705 kcps at 184 MBq) for an energy window of 450 - 600 keV and a coincidence window of 1 ns for mouse (rat) phantoms. The absolute sensitivity at the center of the field of view was 12.6%. Radial, tangential, and axial resolutions of 22Na point sources reconstructed with a list-mode maximum likelihood expectation maximization algorithm were <= 0.8 mm (FWHM) throughout the field of view. Hot-rod inserts of < 0.8 mm diameter were resolvable in the transaxial image of a micro-Derenzo phantom. The simulations show that a liquid xenon system would provide new capabilities for significantly enhancing PET images. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.5101v2-abstract-full').style.display = 'none'; document.getElementById('1107.5101v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Med. Biol. 57 (2012) 1685-1700 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1106.1238">arXiv:1106.1238</a> <span> [<a href="https://arxiv.org/pdf/1106.1238">pdf</a>, <a href="https://arxiv.org/ps/1106.1238">ps</a>, <a href="https://arxiv.org/format/1106.1238">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2011.06.067">10.1016/j.nima.2011.06.067 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The T2K Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=T2K+Collaboration"> T2K Collaboration</a>, <a href="/search/physics?searchtype=author&query=Abe%2C+K">K. Abe</a>, <a href="/search/physics?searchtype=author&query=Abgrall%2C+N">N. Abgrall</a>, <a href="/search/physics?searchtype=author&query=Aihara%2C+H">H. Aihara</a>, <a href="/search/physics?searchtype=author&query=Ajima%2C+Y">Y. Ajima</a>, <a href="/search/physics?searchtype=author&query=Albert%2C+J+B">J. B. Albert</a>, <a href="/search/physics?searchtype=author&query=Allan%2C+D">D. Allan</a>, <a href="/search/physics?searchtype=author&query=Amaudruz%2C+P+-">P. -A. Amaudruz</a>, <a href="/search/physics?searchtype=author&query=Andreopoulos%2C+C">C. Andreopoulos</a>, <a href="/search/physics?searchtype=author&query=Andrieu%2C+B">B. Andrieu</a>, <a href="/search/physics?searchtype=author&query=Anerella%2C+M+D">M. D. Anerella</a>, <a href="/search/physics?searchtype=author&query=Angelsen%2C+C">C. Angelsen</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+S">S. Aoki</a>, <a href="/search/physics?searchtype=author&query=Araoka%2C+O">O. Araoka</a>, <a href="/search/physics?searchtype=author&query=Argyriades%2C+J">J. Argyriades</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+A">A. Ariga</a>, <a href="/search/physics?searchtype=author&query=Ariga%2C+T">T. Ariga</a>, <a href="/search/physics?searchtype=author&query=Assylbekov%2C+S">S. Assylbekov</a>, <a href="/search/physics?searchtype=author&query=de+Andr%C3%A9%2C+J+P+A+M">J. P. A. M. de Andr茅</a>, <a href="/search/physics?searchtype=author&query=Autiero%2C+D">D. Autiero</a>, <a href="/search/physics?searchtype=author&query=Badertscher%2C+A">A. Badertscher</a>, <a href="/search/physics?searchtype=author&query=Ballester%2C+O">O. Ballester</a>, <a href="/search/physics?searchtype=author&query=Barbi%2C+M">M. Barbi</a>, <a href="/search/physics?searchtype=author&query=Barker%2C+G+J">G. J. Barker</a>, <a href="/search/physics?searchtype=author&query=Baron%2C+P">P. Baron</a> , et al. (499 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1106.1238v2-abstract-short" style="display: inline;"> The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle 胃_{13} by observing 谓_e appearance in a 谓_渭 beam. It also aims to make a precision measurement of the known oscillation parameters, 螖m^{2}_{23} and sin^{2} 2胃_{23}, via 谓_渭 disappearance studies. Other goals of the experiment include various neutrino cross… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.1238v2-abstract-full').style.display = 'inline'; document.getElementById('1106.1238v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1106.1238v2-abstract-full" style="display: none;"> The T2K experiment is a long-baseline neutrino oscillation experiment. Its main goal is to measure the last unknown lepton sector mixing angle 胃_{13} by observing 谓_e appearance in a 谓_渭 beam. It also aims to make a precision measurement of the known oscillation parameters, 螖m^{2}_{23} and sin^{2} 2胃_{23}, via 谓_渭 disappearance studies. Other goals of the experiment include various neutrino cross section measurements and sterile neutrino searches. The experiment uses an intense proton beam generated by the J-PARC accelerator in Tokai, Japan, and is composed of a neutrino beamline, a near detector complex (ND280), and a far detector (Super-Kamiokande) located 295 km away from J-PARC. This paper provides a comprehensive review of the instrumentation aspect of the T2K experiment and a summary of the vital information for each subsystem. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1106.1238v2-abstract-full').style.display = 'none'; document.getElementById('1106.1238v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">33 pages, 32 figures, Submitted and accepted by NIM A. Editor: Prof. Chang Kee Jung, Department of Physics and Astronomy, SUNY Stony Brook, chang.jung@sunysb.edu, 631-632-8108 Submit Edited to remove line numbers</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1105.0037">arXiv:1105.0037</a> <span> [<a href="https://arxiv.org/pdf/1105.0037">pdf</a>, <a href="https://arxiv.org/ps/1105.0037">ps</a>, <a href="https://arxiv.org/format/1105.0037">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-011-0299-3">10.1007/s10751-011-0299-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards Antihydrogen Trapping and Spectroscopy at ALPHA </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Butler%2C+E">Eoin Butler</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">Gorm. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">Mohammad. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">Marcelo Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">William Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">Paul D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">Crystal C. Bray</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">Claudio L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">Steven Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">Michael Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">Joel Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">Tim Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">David R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">Jeffrey S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">Walter N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ruyugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">Michael E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">Andrew J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">Richard Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">Svante Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Leonid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">Ricardo Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">Niels Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">Scott Menary</a> , et al. (15 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1105.0037v1-abstract-short" style="display: inline;"> Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.0037v1-abstract-full').style.display = 'inline'; document.getElementById('1105.0037v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1105.0037v1-abstract-full" style="display: none;"> Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques to directly measure the antiproton temperature and a new technique to cool them to below 10 K. We also show how our unique position-sensitive annihilation detector provides us with a highly sensitive method of identifying antiproton annihilations and effectively rejecting the cosmic-ray background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.0037v1-abstract-full').style.display = 'none'; document.getElementById('1105.0037v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.4982">arXiv:1104.4982</a> <span> [<a href="https://arxiv.org/pdf/1104.4982">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/nphys2025">10.1038/nphys2025 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Confinement of antihydrogen for 1000 seconds </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ALPHA+Collaboration"> ALPHA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Deller%2C+A">A. Deller</a>, <a href="/search/physics?searchtype=author&query=Eriksson%2C+S">S. Eriksson</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Gutierrez%2C+A">A. Gutierrez</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kemp%2C+S">S. Kemp</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a> , et al. (14 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1104.4982v1-abstract-short" style="display: inline;"> Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms. A critical… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4982v1-abstract-full').style.display = 'inline'; document.getElementById('1104.4982v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4982v1-abstract-full" style="display: none;"> Atoms made of a particle and an antiparticle are unstable, usually surviving less than a microsecond. Antihydrogen, made entirely of antiparticles, is believed to be stable, and it is this longevity that holds the promise of precision studies of matter-antimatter symmetry. We have recently demonstrated trapping of antihydrogen atoms by releasing them after a confinement time of 172 ms. A critical question for future studies is: how long can anti-atoms be trapped? Here we report the observation of anti-atom confinement for 1000 s, extending our earlier results by nearly four orders of magnitude. Our calculations indicate that most of the trapped anti-atoms reach the ground state. Further, we report the first measurement of the energy distribution of trapped antihydrogen which, coupled with detailed comparisons with simulations, provides a key tool for the systematic investigation of trapping dynamics. These advances open up a range of experimental possibilities, including precision studies of CPT symmetry and cooling to temperatures where gravitational effects could become apparent. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4982v1-abstract-full').style.display = 'none'; document.getElementById('1104.4982v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">30 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-11-02 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Phys.7:558-564,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.4661">arXiv:1104.4661</a> <span> [<a href="https://arxiv.org/pdf/1104.4661">pdf</a>, <a href="https://arxiv.org/ps/1104.4661">ps</a>, <a href="https://arxiv.org/format/1104.4661">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> </div> <p class="title is-5 mathjax"> Alpha Antihydrogen Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ALPHA+Collaboration"> ALPHA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">C. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1104.4661v1-abstract-short" style="display: inline;"> ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.4661v1-abstract-full" style="display: none;"> ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. After reviewing the motivations, we discuss our recent progress toward the initial goal of stable trapping of antihydrogen, with some emphasis on particle detection techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.4661v1-abstract-full').style.display = 'none'; document.getElementById('1104.4661v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Invited talk presented at the Fifth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 28-July 2, 2010</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Proceedings of the Fifth Meeting on CPT and Lorentz Symmetry, Ed. V.A. Kostelecky, pp. 50-54, World Scientific (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1104.1458">arXiv:1104.1458</a> <span> [<a href="https://arxiv.org/pdf/1104.1458">pdf</a>, <a href="https://arxiv.org/ps/1104.1458">ps</a>, <a href="https://arxiv.org/format/1104.1458">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/312/6/062006">10.1088/1742-6596/312/6/062006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Liquid Xenon Detectors for Positron Emission Tomography </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Miceli%2C+A">A. Miceli</a>, <a href="/search/physics?searchtype=author&query=Amaudruz%2C+P">P. Amaudruz</a>, <a href="/search/physics?searchtype=author&query=Benard%2C+F">F. Benard</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D+A">D. A. Bryman</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Martin%2C+J+P">J. P. Martin</a>, <a href="/search/physics?searchtype=author&query=Muennich%2C+A">A. Muennich</a>, <a href="/search/physics?searchtype=author&query=Retiere%2C+F">F. Retiere</a>, <a href="/search/physics?searchtype=author&query=Ruth%2C+T+J">T. J. Ruth</a>, <a href="/search/physics?searchtype=author&query=Sossi%2C+V">V. Sossi</a>, <a href="/search/physics?searchtype=author&query=Stoessl%2C+A+J">A. J. Stoessl</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1104.1458v1-abstract-short" style="display: inline;"> PET is a functional imaging technique based on detection of annihilation photons following beta decay producing positrons. In this paper, we present the concept of a new PET system for preclinical applications consisting of a ring of twelve time projection chambers filled with liquid xenon viewed by avalanche photodiodes. Simultaneous measurement of ionization charge and scintillation light leads… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.1458v1-abstract-full').style.display = 'inline'; document.getElementById('1104.1458v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1104.1458v1-abstract-full" style="display: none;"> PET is a functional imaging technique based on detection of annihilation photons following beta decay producing positrons. In this paper, we present the concept of a new PET system for preclinical applications consisting of a ring of twelve time projection chambers filled with liquid xenon viewed by avalanche photodiodes. Simultaneous measurement of ionization charge and scintillation light leads to a significant improvement to spatial resolution, image quality, and sensitivity. Simulated performance shows that an energy resolution of <10% (FWHM) and a sensitivity of 15% are achievable. First tests with a prototype TPC indicate position resolution <1 mm (FWHM). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1104.1458v1-abstract-full').style.display = 'none'; document.getElementById('1104.1458v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 April, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Paper presented at the International Nuclear Physics Conference, Vancouver, Canada, 2010</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J.Phys.Conf.Ser.312:062006,2011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1012.4110">arXiv:1012.4110</a> <span> [<a href="https://arxiv.org/pdf/1012.4110">pdf</a>, <a href="https://arxiv.org/ps/1012.4110">ps</a>, <a href="https://arxiv.org/format/1012.4110">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2010.11.004">10.1016/j.physletb.2010.11.004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search For Trapped Antihydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">Gorm B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">Mohammad D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">Marcelo Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">William Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">Paul D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">Crystal C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">Eoin Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">Claudio L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">Steven Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">Michael Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">Joel Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">Tim Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">Makoto C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">David R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">Jeffrey S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">Walter N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">Ryugo S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">Michael E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">Andrew J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">Richard Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">Svante Jonsell</a>, <a href="/search/physics?searchtype=author&query=J%C3%B8rgensen%2C+L+V">Lars V. J酶rgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">Lenoid Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">Ricardo Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">Niels Madsen</a> , et al. (17 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1012.4110v1-abstract-short" style="display: inline;"> We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental param… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.4110v1-abstract-full').style.display = 'inline'; document.getElementById('1012.4110v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1012.4110v1-abstract-full" style="display: none;"> We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental parameters. The use of a position-sensitive annihilation vertex detector, together with the capability of controllably quenching the superconducting magnetic minimum trap, enabled us to carry out a high-sensitivity and low-background search for trapped synthesised antihydrogen atoms. We aim to identify the annihilations of antihydrogen atoms held for at least 130 ms in the trap before being released over ~30 ms. After a three-week experimental run in 2009 involving mixing of 10^7 antiprotons with 1.3 10^9 positrons to produce 6 10^5 antihydrogen atoms, we have identified six antiproton annihilation events that are consistent with the release of trapped antihydrogen. The cosmic ray background, estimated to contribute 0.14 counts, is incompatible with this observation at a significance of 5.6 sigma. Extensive simulations predict that an alternative source of annihilations, the escape of mirror-trapped antiprotons, is highly unlikely, though this possibility has not yet been ruled out experimentally. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1012.4110v1-abstract-full').style.display = 'none'; document.getElementById('1012.4110v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 December, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 695 (2011) 95-104 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1009.4687">arXiv:1009.4687</a> <span> [<a href="https://arxiv.org/pdf/1009.4687">pdf</a>, <a href="https://arxiv.org/format/1009.4687">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.105.013003">10.1103/PhysRevLett.105.013003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Evaporative Cooling of Antiprotons to Cryogenic Temperatures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ALPHA+Collaboration"> ALPHA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Ashkezari%2C+M+D">M. D. Ashkezari</a>, <a href="/search/physics?searchtype=author&query=Baquero-Ruiz%2C+M">M. Baquero-Ruiz</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Friesen%2C+T">T. Friesen</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A">A. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jonsell%2C+S">S. Jonsell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Menary%2C+S">S. Menary</a> , et al. (15 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1009.4687v1-abstract-short" style="display: inline;"> We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9~K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1009.4687v1-abstract-full').style.display = 'inline'; document.getElementById('1009.4687v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1009.4687v1-abstract-full" style="display: none;"> We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9~K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibilities for cooling of trapped ions and is of particular interest in antiproton physics, where a precise \emph{CPT} test on trapped antihydrogen is a long-standing goal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1009.4687v1-abstract-full').style.display = 'none'; document.getElementById('1009.4687v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.105:013003,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1005.1784">arXiv:1005.1784</a> <span> [<a href="https://arxiv.org/pdf/1005.1784">pdf</a>, <a href="https://arxiv.org/ps/1005.1784">ps</a>, <a href="https://arxiv.org/format/1005.1784">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/5/05/P05005">10.1088/1748-0221/5/05/P05005 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Relative luminosity measurement of the LHC with the ATLAS forward calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Afonin%2C+A">A. Afonin</a>, <a href="/search/physics?searchtype=author&query=Akimov%2C+A+V">A. V. Akimov</a>, <a href="/search/physics?searchtype=author&query=Barillari%2C+T">T. Barillari</a>, <a href="/search/physics?searchtype=author&query=Bezzubov%2C+V">V. Bezzubov</a>, <a href="/search/physics?searchtype=author&query=Blagov%2C+M">M. Blagov</a>, <a href="/search/physics?searchtype=author&query=Braun%2C+H+M">H. M. Braun</a>, <a href="/search/physics?searchtype=author&query=Bruncko%2C+D">D. Bruncko</a>, <a href="/search/physics?searchtype=author&query=Chekulaev%2C+S+V">S. V. Chekulaev</a>, <a href="/search/physics?searchtype=author&query=Cheplakov%2C+A">A. Cheplakov</a>, <a href="/search/physics?searchtype=author&query=Degele%2C+R">R. Degele</a>, <a href="/search/physics?searchtype=author&query=Denisov%2C+S+P">S. P. Denisov</a>, <a href="/search/physics?searchtype=author&query=Drobin%2C+V">V. Drobin</a>, <a href="/search/physics?searchtype=author&query=Eckstein%2C+P">P. Eckstein</a>, <a href="/search/physics?searchtype=author&query=Ershov%2C+V">V. Ershov</a>, <a href="/search/physics?searchtype=author&query=Evdokimov%2C+V+N">V. N. Evdokimov</a>, <a href="/search/physics?searchtype=author&query=Ferencei%2C+J">J. Ferencei</a>, <a href="/search/physics?searchtype=author&query=Fimushkin%2C+V">V. Fimushkin</a>, <a href="/search/physics?searchtype=author&query=Fischer%2C+A">A. Fischer</a>, <a href="/search/physics?searchtype=author&query=Futterschneider%2C+H">H. Futterschneider</a>, <a href="/search/physics?searchtype=author&query=Garkusha%2C+V">V. Garkusha</a>, <a href="/search/physics?searchtype=author&query=Glatte%2C+A">A. Glatte</a>, <a href="/search/physics?searchtype=author&query=Handel%2C+C">C. Handel</a>, <a href="/search/physics?searchtype=author&query=Huber%2C+J">J. Huber</a>, <a href="/search/physics?searchtype=author&query=Javadov%2C+N">N. Javadov</a>, <a href="/search/physics?searchtype=author&query=Kazarinov%2C+M">M. Kazarinov</a> , et al. (54 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1005.1784v1-abstract-short" style="display: inline;"> In this paper it is shown that a measurement of the relative luminosity changes at the LHC may be obtained by analysing the currents drawn from the high voltage power supplies of the electromagnetic section of the forward calorimeter of the ATLAS detector. The method was verified with a reproduction of a small section of the ATLAS forward calorimeter using proton beams of known beam energies and v… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1005.1784v1-abstract-full').style.display = 'inline'; document.getElementById('1005.1784v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1005.1784v1-abstract-full" style="display: none;"> In this paper it is shown that a measurement of the relative luminosity changes at the LHC may be obtained by analysing the currents drawn from the high voltage power supplies of the electromagnetic section of the forward calorimeter of the ATLAS detector. The method was verified with a reproduction of a small section of the ATLAS forward calorimeter using proton beams of known beam energies and variable intensities at the U-70 accelerator at IHEP in Protvino, Russia. The experimental setup and the data taking during a test beam run in April 2008 are described in detail. A comparison of the measured high voltage currents with reference measurements from beam intensity monitors shows a linear dependence on the beam intensity. The non-linearities are measured to be less than 0.5 % combining statistical and systematic uncertainties. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1005.1784v1-abstract-full').style.display = 'none'; document.getElementById('1005.1784v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 May, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> 0036327 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> JINST 5:P05005,2010 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1003.2235">arXiv:1003.2235</a> <span> [<a href="https://arxiv.org/pdf/1003.2235">pdf</a>, <a href="https://arxiv.org/ps/1003.2235">ps</a>, <a href="https://arxiv.org/format/1003.2235">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2010.05.037">10.1016/j.nima.2010.05.037 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of a Large NaI(Tl) Crystal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aguilar-Arevalo%2C+A">A. Aguilar-Arevalo</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+M">M. Aoki</a>, <a href="/search/physics?searchtype=author&query=Blecher%2C+M">M. Blecher</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D+A">D. A. Bryman</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gumplinger%2C+P">P. Gumplinger</a>, <a href="/search/physics?searchtype=author&query=Hussein%2C+A">A. Hussein</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+N">N. Ito</a>, <a href="/search/physics?searchtype=author&query=Kettell%2C+S">S. Kettell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Littenberg%2C+L">L. Littenberg</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Numao%2C+T">T. Numao</a>, <a href="/search/physics?searchtype=author&query=Poutissou%2C+R">R. Poutissou</a>, <a href="/search/physics?searchtype=author&query=Sher%2C+A">A. Sher</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+K">K. Yamada</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1003.2235v1-abstract-short" style="display: inline;"> Using a narrow band positron beam, the response of a large high-resolution NaI(Tl) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1003.2235v1-abstract-full" style="display: none;"> Using a narrow band positron beam, the response of a large high-resolution NaI(Tl) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1003.2235v1-abstract-full').style.display = 'none'; document.getElementById('1003.2235v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 March, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2010. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.3036">arXiv:1002.3036</a> <span> [<a href="https://arxiv.org/pdf/1002.3036">pdf</a>, <a href="https://arxiv.org/ps/1002.3036">ps</a>, <a href="https://arxiv.org/format/1002.3036">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2010.01.066">10.1016/j.physletb.2010.01.066 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Antihydrogen formation dynamics in a multipolar neutral anti-atom trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C">C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=J%C3%B8rgensen%2C+L+V">L. V. J酶rgensen</a>, <a href="/search/physics?searchtype=author&query=Kerrigan%2C+S+J">S. J. Kerrigan</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">K. Olchanski</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a> , et al. (11 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1002.3036v1-abstract-short" style="display: inline;"> Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms. Using our unique annihilation imaging detector, we correlate antihydrogen detection by imaging and by field-ionization for the first time. We further establish how field-ionization causes radial redistribution of the antiprotons duri… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3036v1-abstract-full').style.display = 'inline'; document.getElementById('1002.3036v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.3036v1-abstract-full" style="display: none;"> Antihydrogen production in a neutral atom trap formed by an octupole-based magnetic field minimum is demonstrated using field-ionization of weakly bound anti-atoms. Using our unique annihilation imaging detector, we correlate antihydrogen detection by imaging and by field-ionization for the first time. We further establish how field-ionization causes radial redistribution of the antiprotons during antihydrogen formation and use this effect for the first simultaneous measurements of strongly and weakly bound antihydrogen atoms. Distinguishing between these provides critical information needed in the process of optimizing for trappable antihydrogen. These observations are of crucial importance to the ultimate goal of performing CPT tests involving antihydrogen, which likely depends upon trapping the anti-atom. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.3036v1-abstract-full').style.display = 'none'; document.getElementById('1002.3036v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 685 (2010) 141 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1001.3121">arXiv:1001.3121</a> <span> [<a href="https://arxiv.org/pdf/1001.3121">pdf</a>, <a href="https://arxiv.org/ps/1001.3121">ps</a>, <a href="https://arxiv.org/format/1001.3121">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2009.08.053">10.1016/j.nima.2009.08.053 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High Purity Pion Beam at TRIUMF </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aguilar-Arevalo%2C+A">A. Aguilar-Arevalo</a>, <a href="/search/physics?searchtype=author&query=Blecher%2C+M">M. Blecher</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D+A">D. A. Bryman</a>, <a href="/search/physics?searchtype=author&query=Comfort%2C+J">J. Comfort</a>, <a href="/search/physics?searchtype=author&query=Doornbos%2C+J">J. Doornbos</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Hussein%2C+A">A. Hussein</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+N">N. Ito</a>, <a href="/search/physics?searchtype=author&query=Kettell%2C+S">S. Kettell</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Malbrunot%2C+C">C. Malbrunot</a>, <a href="/search/physics?searchtype=author&query=Marshall%2C+G+M">G. M. Marshall</a>, <a href="/search/physics?searchtype=author&query=Numao%2C+T">T. Numao</a>, <a href="/search/physics?searchtype=author&query=Poutissou%2C+R">R. Poutissou</a>, <a href="/search/physics?searchtype=author&query=Sher%2C+A">A. Sher</a>, <a href="/search/physics?searchtype=author&query=Walker%2C+B">B. Walker</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+K">K. Yamada</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1001.3121v1-abstract-short" style="display: inline;"> An extension of the TRIUMF M13 low-energy pion channel designed to suppress positrons based on an energy-loss technique is described. A source of beam channel momentum calibration from the decay pi+ --> e+ nu is also described. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1001.3121v1-abstract-full" style="display: none;"> An extension of the TRIUMF M13 low-energy pion channel designed to suppress positrons based on an energy-loss technique is described. A source of beam channel momentum calibration from the decay pi+ --> e+ nu is also described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.3121v1-abstract-full').style.display = 'none'; document.getElementById('1001.3121v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 January, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instrument and Methods in Physics Research A 609 (2009) 102 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0906.4075">arXiv:0906.4075</a> <span> [<a href="https://arxiv.org/pdf/0906.4075">pdf</a>, <a href="https://arxiv.org/ps/0906.4075">ps</a>, <a href="https://arxiv.org/format/0906.4075">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2009.06.036">10.1016/j.nima.2009.06.036 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simultaneous reconstruction of scintillation light and ionization charge produced by 511 keV photons in liquid xenon : potential application to PET </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Amaudruz%2C+P">P. Amaudruz</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lu%2C+P">P. Lu</a>, <a href="/search/physics?searchtype=author&query=Marshal%2C+C">C. Marshal</a>, <a href="/search/physics?searchtype=author&query=Martin%2C+J+P">J. P. Martin</a>, <a href="/search/physics?searchtype=author&query=Muennich%2C+A">A. Muennich</a>, <a href="/search/physics?searchtype=author&query=Retiere%2C+F">F. Retiere</a>, <a href="/search/physics?searchtype=author&query=Sher%2C+A">A. Sher</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0906.4075v1-abstract-short" style="display: inline;"> In order to assess the performance of liquid xenon detectors for use in positron emission tomography we studied the scintillation light and ionization charge produced by 511 keV photons in a small prototype detector. Scintillation light was detected with large area avalanche photodiodes while ionization electrons were collected on an anode instrumented with low noise electronics after drifting u… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.4075v1-abstract-full').style.display = 'inline'; document.getElementById('0906.4075v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0906.4075v1-abstract-full" style="display: none;"> In order to assess the performance of liquid xenon detectors for use in positron emission tomography we studied the scintillation light and ionization charge produced by 511 keV photons in a small prototype detector. Scintillation light was detected with large area avalanche photodiodes while ionization electrons were collected on an anode instrumented with low noise electronics after drifting up to 3 cm. Operational conditions were studied as a function of the electric field. Energy resolutions of <10 % (FWHM) were achieved by combining the scintillation light and ionization charge signals. The relationship between scintillation light and ionization signals was investigated. An analysis of the sources of fluctuations was performed in order to optimize future detector designs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.4075v1-abstract-full').style.display = 'none'; document.getElementById('0906.4075v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 June, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A607:668-676,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0807.0074">arXiv:0807.0074</a> <span> [<a href="https://arxiv.org/pdf/0807.0074">pdf</a>, <a href="https://arxiv.org/ps/0807.0074">ps</a>, <a href="https://arxiv.org/format/0807.0074">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.2899305">10.1063/1.2899305 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A novel antiproton radial diagnostic based on octupole induced ballistic loss </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">C. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Funakoshi%2C+R">R. Funakoshi</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jenkins%2C+M+J">M. J. Jenkins</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">K. Olchanski</a> , et al. (13 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0807.0074v1-abstract-short" style="display: inline;"> We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. We show several examples of how this diagnostic helps us to understand the radial dynamics of antiproton… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0074v1-abstract-full').style.display = 'inline'; document.getElementById('0807.0074v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0807.0074v1-abstract-full" style="display: none;"> We report results from a novel diagnostic that probes the outer radial profile of trapped antiproton clouds. The diagnostic allows us to determine the profile by monitoring the time-history of antiproton losses that occur as an octupole field in the antiproton confinement region is increased. We show several examples of how this diagnostic helps us to understand the radial dynamics of antiprotons in normal and nested Penning-Malmberg traps. Better understanding of these dynamics may aid current attempts to trap antihydrogen atoms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0807.0074v1-abstract-full').style.display = 'none'; document.getElementById('0807.0074v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 July, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Plasmas 15:032107,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0805.4082">arXiv:0805.4082</a> <span> [<a href="https://arxiv.org/pdf/0805.4082">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.2977840">10.1063/1.2977840 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=ALPHA+Collaboration"> ALPHA Collaboration</a>, <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G+B">G. B. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Bray%2C+C+C">C. C. Bray</a>, <a href="/search/physics?searchtype=author&query=Butler%2C+E">E. Butler</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Funakoshi%2C+R">R. Funakoshi</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hayden%2C+M+E">M. E. Hayden</a>, <a href="/search/physics?searchtype=author&query=Humphries%2C+A+J">A. J. Humphries</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jenkins%2C+M+J">M. J. Jenkins</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Lai%2C+W">W. Lai</a>, <a href="/search/physics?searchtype=author&query=Lambo%2C+R">R. Lambo</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a> , et al. (15 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0805.4082v1-abstract-short" style="display: inline;"> We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive te… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.4082v1-abstract-full').style.display = 'inline'; document.getElementById('0805.4082v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0805.4082v1-abstract-full" style="display: none;"> We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN's Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive tests of CPT, possibly probing physics at the Planck Scale. We discuss some of the particle detection techniques used in ALPHA. Preliminary results from commissioning studies of a partial system of the ALPHA Si vertex detector are presented, the results of which highlight the power of annihilation vertex detection capability in antihydrogen studies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.4082v1-abstract-full').style.display = 'none'; document.getElementById('0805.4082v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Invited talk at Pbar08 - Workshop on Cold Antimatter Plasmas and Application to Fundamental Physics, Okinawa, Japan, 2008. 14 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRIUMF Preprint: TRI-PP-08-01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> AIP Conf.Proc.1037:208-220,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0704.3320">arXiv:0704.3320</a> <span> [<a href="https://arxiv.org/pdf/0704.3320">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Plasma Physics">physics.plasm-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/s10751-007-9527-2">10.1007/s10751-007-9527-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Towards Antihydrogen Confinement with the ALPHA Antihydrogen Trap </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fujiwara%2C+M+C">M. C. Fujiwara</a>, <a href="/search/physics?searchtype=author&query=Andresen%2C+G">G. Andresen</a>, <a href="/search/physics?searchtype=author&query=Bertsche%2C+W">W. Bertsche</a>, <a href="/search/physics?searchtype=author&query=Boston%2C+A">A. Boston</a>, <a href="/search/physics?searchtype=author&query=Bowe%2C+P+D">P. D. Bowe</a>, <a href="/search/physics?searchtype=author&query=Cesar%2C+C+L">C. L. Cesar</a>, <a href="/search/physics?searchtype=author&query=Chapman%2C+S">S. Chapman</a>, <a href="/search/physics?searchtype=author&query=Charlton%2C+M">M. Charlton</a>, <a href="/search/physics?searchtype=author&query=Chartier%2C+M">M. Chartier</a>, <a href="/search/physics?searchtype=author&query=Deutsch%2C+A">A. Deutsch</a>, <a href="/search/physics?searchtype=author&query=Fajans%2C+J">J. Fajans</a>, <a href="/search/physics?searchtype=author&query=Funakoshi%2C+R">R. Funakoshi</a>, <a href="/search/physics?searchtype=author&query=Gill%2C+D+R">D. R. Gill</a>, <a href="/search/physics?searchtype=author&query=Gomberoff%2C+K">K. Gomberoff</a>, <a href="/search/physics?searchtype=author&query=Hangst%2C+J+S">J. S. Hangst</a>, <a href="/search/physics?searchtype=author&query=Hardy%2C+W+N">W. N. Hardy</a>, <a href="/search/physics?searchtype=author&query=Hayano%2C+R+S">R. S. Hayano</a>, <a href="/search/physics?searchtype=author&query=Hydomako%2C+R">R. Hydomako</a>, <a href="/search/physics?searchtype=author&query=Jenkins%2C+M+J">M. J. Jenkins</a>, <a href="/search/physics?searchtype=author&query=Jorgensen%2C+L+V">L. V. Jorgensen</a>, <a href="/search/physics?searchtype=author&query=Kurchaninov%2C+L">L. Kurchaninov</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+N">N. Madsen</a>, <a href="/search/physics?searchtype=author&query=Nolan%2C+P">P. Nolan</a>, <a href="/search/physics?searchtype=author&query=Olchanski%2C+K">K. Olchanski</a>, <a href="/search/physics?searchtype=author&query=Olin%2C+A">A. Olin</a> , et al. (10 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0704.3320v1-abstract-short" style="display: inline;"> ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0704.3320v1-abstract-full" style="display: none;"> ALPHA is an international project that has recently begun experimentation at CERN's Antiproton Decelerator (AD) facility. The primary goal of ALPHA is stable trapping of cold antihydrogen atoms with the ultimate goal of precise spectroscopic comparisons with hydrogen. We discuss the status of the ALPHA project and the prospects for antihydrogen trapping. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0704.3320v1-abstract-full').style.display = 'none'; document.getElementById('0704.3320v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 April, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Invited talk at International Conference on Trapped Charged Particles and Fundamental Physics: TCP06, Parksville, BC, Canada, September 2006. To be published in Hyperfine Interactions</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> TRI-PP-07-03 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0407009">arXiv:physics/0407009</a> <span> [<a href="https://arxiv.org/pdf/physics/0407009">pdf</a>, <a href="https://arxiv.org/ps/physics/0407009">ps</a>, <a href="https://arxiv.org/format/physics/0407009">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2004.05.133">10.1016/j.nima.2004.05.133 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Hadronic Calibration of the ATLAS Liquid Argon End-Cap Calorimeter in the Pseudorapidity Region 1.6 < |eta| < 1.8 in Beam Tests </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cojocaru%2C+C">C. Cojocaru</a>, <a href="/search/physics?searchtype=author&query=Pinfold%2C+J">J. Pinfold</a>, <a href="/search/physics?searchtype=author&query=Soukup%2C+J">J. Soukup</a>, <a href="/search/physics?searchtype=author&query=Vincter%2C+M">M. Vincter</a>, <a href="/search/physics?searchtype=author&query=Datskov%2C+V">V. Datskov</a>, <a href="/search/physics?searchtype=author&query=Fedorov%2C+A">A. Fedorov</a>, <a href="/search/physics?searchtype=author&query=Golubykh%2C+S">S. Golubykh</a>, <a href="/search/physics?searchtype=author&query=Javadov%2C+N">N. Javadov</a>, <a href="/search/physics?searchtype=author&query=Kalinnikov%2C+V">V. Kalinnikov</a>, <a href="/search/physics?searchtype=author&query=Kakurin%2C+S">S. Kakurin</a>, <a href="/search/physics?searchtype=author&query=Kazarinov%2C+M">M. Kazarinov</a>, <a href="/search/physics?searchtype=author&query=Kukhtin%2C+V">V. Kukhtin</a>, <a href="/search/physics?searchtype=author&query=Ladygin%2C+E">E. Ladygin</a>, <a href="/search/physics?searchtype=author&query=Lazarev%2C+A">A. Lazarev</a>, <a href="/search/physics?searchtype=author&query=Neganov%2C+A">A. Neganov</a>, <a href="/search/physics?searchtype=author&query=Pisarev%2C+I">I. Pisarev</a>, <a href="/search/physics?searchtype=author&query=Rousakovitch%2C+N">N. Rousakovitch</a>, <a href="/search/physics?searchtype=author&query=Serochkin%2C+E">E. Serochkin</a>, <a href="/search/physics?searchtype=author&query=Shilov%2C+S">S. Shilov</a>, <a href="/search/physics?searchtype=author&query=Shalyugin%2C+A">A. Shalyugin</a>, <a href="/search/physics?searchtype=author&query=Usov%2C+Y">Yu. Usov</a>, <a href="/search/physics?searchtype=author&query=Bruncko%2C+D">D. Bruncko</a>, <a href="/search/physics?searchtype=author&query=Chytracek%2C+R">R. Chytracek</a>, <a href="/search/physics?searchtype=author&query=Kladiva%2C+E">E. Kladiva</a>, <a href="/search/physics?searchtype=author&query=Strizenec%2C+P">P. Strizenec</a> , et al. (91 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0407009v1-abstract-short" style="display: inline;"> A full azimuthal phi-wedge of the ATLAS liquid argon end-cap calorimeter has been exposed to beams of electrons, muons and pions in the energy range 6 GeV <= E <= 200 GeV at the CERN SPS. The angular region studied corresponds to the ATLAS impact position around the pseudorapidity interval 1.6 < |eta| < 1.8. The beam test set-up is described. A detailed study of the performance is given as well… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0407009v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0407009v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0407009v1-abstract-full" style="display: none;"> A full azimuthal phi-wedge of the ATLAS liquid argon end-cap calorimeter has been exposed to beams of electrons, muons and pions in the energy range 6 GeV <= E <= 200 GeV at the CERN SPS. The angular region studied corresponds to the ATLAS impact position around the pseudorapidity interval 1.6 < |eta| < 1.8. The beam test set-up is described. A detailed study of the performance is given as well as the related intercalibration constants obtained. Following the ATLAS hadronic calibration proposal, a first study of the hadron calibration using a weighting ansatz is presented. The results are compared to predictions from Monte Carlo simulations, based on GEANT 3 and GEANT 4 models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0407009v1-abstract-full').style.display = 'none'; document.getElementById('physics/0407009v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 July, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">66 pages, 60 Postscript figures, submitted to NIM A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> MPP-2004-81 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A531:481-514,2004 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 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