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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/2403.05145">arXiv:2403.05145</a> <span> [<a href="https://arxiv.org/pdf/2403.05145">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> </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/10.1080/10619127.2023.2198913">10.1080/10619127.2023.2198913 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Investigating the Proton Structure: The FAMU experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vacchi%2C+A">A. Vacchi</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Carsi%2C+S">S. Carsi</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchi%2C+C">C. De Vecchi</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=King%2C+P+J+C">P. J. C. King</a> , et al. (24 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="2403.05145v1-abstract-short" style="display: inline;"> The article gives the motivations for the measurement of the hyperfine splitting (hfs) in the ground state of muonic hydrogen to explore the properties of the proton at low momentum transfer. It summarizes these proposed measurement methods and finally describes the FAMU experiment in more detail. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.05145v1-abstract-full" style="display: none;"> The article gives the motivations for the measurement of the hyperfine splitting (hfs) in the ground state of muonic hydrogen to explore the properties of the proton at low momentum transfer. It summarizes these proposed measurement methods and finally describes the FAMU experiment in more detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05145v1-abstract-full').style.display = 'none'; document.getElementById('2403.05145v1-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 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Physics News 33:4, 9-16, 2023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.01835">arXiv:2403.01835</a> <span> [<a href="https://arxiv.org/pdf/2403.01835">pdf</a>, <a href="https://arxiv.org/format/2403.01835">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/10.1038/s41586-024-08209-y">10.1038/s41586-024-08209-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Strong-field quantum control in the extreme ultraviolet using pulse shaping </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Richter%2C+F">Fabian Richter</a>, <a href="/search/physics?searchtype=author&query=Saalmann%2C+U">Ulf Saalmann</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">Enrico Allaria</a>, <a href="/search/physics?searchtype=author&query=Wollenhaupt%2C+M">Matthias Wollenhaupt</a>, <a href="/search/physics?searchtype=author&query=Ardini%2C+B">Benedetto Ardini</a>, <a href="/search/physics?searchtype=author&query=Brynes%2C+A">Alexander Brynes</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Cerullo%2C+G">Giulio Cerullo</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">Alexander Demidovich</a>, <a href="/search/physics?searchtype=author&query=Dulitz%2C+K">Katrin Dulitz</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Ganeshamandiram%2C+S+D">Sarang Dev Ganeshamandiram</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6lz%2C+N">Nicolai G枚lz</a>, <a href="/search/physics?searchtype=author&query=Hartweg%2C+S">Sebastian Hartweg</a>, <a href="/search/physics?searchtype=author&query=von+Issendorff%2C+B">Bernd von Issendorff</a>, <a href="/search/physics?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/physics?searchtype=author&query=Landmesser%2C+F">Friedemann Landmesser</a>, <a href="/search/physics?searchtype=author&query=Li%2C+Y">Yilin Li</a>, <a href="/search/physics?searchtype=author&query=Manfredda%2C+M">Michele Manfredda</a>, <a href="/search/physics?searchtype=author&query=Manzoni%2C+C">Cristian Manzoni</a>, <a href="/search/physics?searchtype=author&query=Michelbach%2C+M">Moritz Michelbach</a>, <a href="/search/physics?searchtype=author&query=Morlok%2C+A">Arne Morlok</a> , et al. (18 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="2403.01835v2-abstract-short" style="display: inline;"> Tailored light-matter interactions in the strong coupling regime enable the manipulation and control of quantum systems with up to unit efficiency, with applications ranging from quantum information to photochemistry. While strong light-matter interactions are readily induced at the valence electron level using long-wavelength radiation, comparable phenomena have been only recently observed with s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.01835v2-abstract-full').style.display = 'inline'; document.getElementById('2403.01835v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.01835v2-abstract-full" style="display: none;"> Tailored light-matter interactions in the strong coupling regime enable the manipulation and control of quantum systems with up to unit efficiency, with applications ranging from quantum information to photochemistry. While strong light-matter interactions are readily induced at the valence electron level using long-wavelength radiation, comparable phenomena have been only recently observed with short wavelengths, accessing highly-excited multi-electron and inner-shell electron states. However, the quantum control of strong-field processes at short wavelengths has not been possible, so far, due to the lack of pulse shaping technologies in the extreme ultraviolet (XUV) and X-ray domain. Here, exploiting pulse shaping of the seeded free-electron laser (FEL) FERMI, we demonstrate the strong-field quantum control of ultrafast Rabi dynamics in helium atoms with high fidelity. Our approach unravels a strong dressing of the ionization continuum, otherwise elusive to experimental observables. The latter is exploited to achieve control of the total ionization rate, with prospective applications in many XUV and soft X-ray experiments. Leveraging recent advances in intense few-femtosecond to attosecond XUV to soft X-ray light sources, our results open an avenue to the efficient manipulation and selective control of core electron processes and electron correlation phenomena in real time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.01835v2-abstract-full').style.display = 'none'; document.getElementById('2403.01835v2-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 October, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 636, 337-341 (2024) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.04987">arXiv:2312.04987</a> <span> [<a href="https://arxiv.org/pdf/2312.04987">pdf</a>, <a href="https://arxiv.org/format/2312.04987">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/10.1088/1748-0221/19/02/C02034">10.1088/1748-0221/19/02/C02034 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Status of the detector setup for the FAMU experiment at RIKEN-RAL for a precision measurement of the Zemach radius of the proton in muonic hydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Rossini%2C+R">R. Rossini</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Banfi%2C+S">S. Banfi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Carsi%2C+S">S. Carsi</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">M. B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=de+Vecchi%2C+C">C. de Vecchi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gaigher%2C+R">R. Gaigher</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a> , et al. (24 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="2312.04987v1-abstract-short" style="display: inline;"> The FAMU experiment at RIKEN-RAL is a muonic atom experiment with the aim to determine the Zemach radius of the proton by measuring the 1s hyperfine splitting in muonic hydrogen. The activity of the FAMU Collaboration in the years 2015-2023 enabled the final optimisation of the detector-target setup as well as the gas working condition in terms of temperature, pressure and gas mixture composition.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04987v1-abstract-full').style.display = 'inline'; document.getElementById('2312.04987v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.04987v1-abstract-full" style="display: none;"> The FAMU experiment at RIKEN-RAL is a muonic atom experiment with the aim to determine the Zemach radius of the proton by measuring the 1s hyperfine splitting in muonic hydrogen. The activity of the FAMU Collaboration in the years 2015-2023 enabled the final optimisation of the detector-target setup as well as the gas working condition in terms of temperature, pressure and gas mixture composition. The experiment has started its data taking in July 2023. The status of the detector setup for the 2023 experimental runs, for the beam characterisation and muonic X-ray detection in the 100-200 keV energy range, is presented and discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04987v1-abstract-full').style.display = 'none'; document.getElementById('2312.04987v1-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 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </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">Submitted to JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.12885">arXiv:2205.12885</a> <span> [<a href="https://arxiv.org/pdf/2205.12885">pdf</a>, <a href="https://arxiv.org/format/2205.12885">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</span> </div> </div> <p class="title is-5 mathjax"> Extreme ultraviolet wave packet interferometry of the autoionizing HeNe dimer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Uhl%2C+D">Daniel Uhl</a>, <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">Andreas Wituschek</a>, <a href="/search/physics?searchtype=author&query=Michiels%2C+R">Rupert Michiels</a>, <a href="/search/physics?searchtype=author&query=Trinter%2C+F">Florian Trinter</a>, <a href="/search/physics?searchtype=author&query=Jahnke%2C+T">Till Jahnke</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">Enrico Allaria</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Dulitz%2C+K">Katrin Dulitz</a>, <a href="/search/physics?searchtype=author&query=Landmesser%2C+F">Friedemann Landmesser</a>, <a href="/search/physics?searchtype=author&query=Michelbach%2C+M">Moritz Michelbach</a>, <a href="/search/physics?searchtype=author&query=Simoncig%2C+A">Alberto Simoncig</a>, <a href="/search/physics?searchtype=author&query=Manfredda%2C+M">Michele Manfredda</a>, <a href="/search/physics?searchtype=author&query=Spampinati%2C+S">Simone Spampinati</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">Giuseppe Penco</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">Richard James Squibb</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">Marcel Mudrich</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin C. Prince</a>, <a href="/search/physics?searchtype=author&query=Cerullo%2C+G">Giulio Cerullo</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</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="2205.12885v2-abstract-short" style="display: inline;"> Femtosecond extreme ultraviolet wave packet interferometry (XUV-WPI) was applied to study resonant inter-atomic Coulombic decay (ICD) in the HeNe dimer. The high demands on phase stability and sensitivity for vibronic XUV-WPI of molecular-beam targets are met using an XUV phase-cycling scheme. The detected quantum interferences exhibit vibronic dephasing and rephasing signatures along with an ultr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.12885v2-abstract-full').style.display = 'inline'; document.getElementById('2205.12885v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.12885v2-abstract-full" style="display: none;"> Femtosecond extreme ultraviolet wave packet interferometry (XUV-WPI) was applied to study resonant inter-atomic Coulombic decay (ICD) in the HeNe dimer. The high demands on phase stability and sensitivity for vibronic XUV-WPI of molecular-beam targets are met using an XUV phase-cycling scheme. The detected quantum interferences exhibit vibronic dephasing and rephasing signatures along with an ultrafast decoherence assigned to the ICD process. A Fourier analysis reveals the molecular absorption spectrum with high resolution. The demonstrated experiment shows a promising route for the real-time analysis of ultrafast ICD processes with both high temporal and spectral resolution. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.12885v2-abstract-full').style.display = 'none'; document.getElementById('2205.12885v2-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, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">7 pages, 4 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/2203.01905">arXiv:2203.01905</a> <span> [<a href="https://arxiv.org/pdf/2203.01905">pdf</a>, <a href="https://arxiv.org/format/2203.01905">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</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/10.1021/acs.jpclett.2c00645">10.1021/acs.jpclett.2c00645 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Time-resolved Ultrafast Interatomic Coulombic Decay in Superexcited Sodium-doped Helium Nanodroplets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Asmussen%2C+J+D">Jakob D. Asmussen</a>, <a href="/search/physics?searchtype=author&query=Michiels%2C+R">Rupert Michiels</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Sisourat%2C+N">Nicolas Sisourat</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">Marcel Binz</a>, <a href="/search/physics?searchtype=author&query=Bruder%2C+L">Lukas Bruder</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin C. Prince</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">Richard J. Squibb</a>, <a href="/search/physics?searchtype=author&query=Uhl%2C+D">Daniel Uhl</a>, <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">Andreas Wituschek</a>, <a href="/search/physics?searchtype=author&query=Zangrando%2C+M">Marco Zangrando</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">Frank Stienkemeier</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">Marcel Mudrich</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="2203.01905v1-abstract-short" style="display: inline;"> The autoionization dynamics of superexcited superfluid He nanodroplets doped with Na atoms is studied by extreme-ultraviolet (XUV) time-resolved electron spectroscopy. Following excitation into the higher-lying droplet absorption band, the droplet relaxes into the lowest metastable atomic $1s2s$ $^{1,\,3}$S states from which Interatomic Coulombic Decay (ICD) takes places either between two excited… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01905v1-abstract-full').style.display = 'inline'; document.getElementById('2203.01905v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.01905v1-abstract-full" style="display: none;"> The autoionization dynamics of superexcited superfluid He nanodroplets doped with Na atoms is studied by extreme-ultraviolet (XUV) time-resolved electron spectroscopy. Following excitation into the higher-lying droplet absorption band, the droplet relaxes into the lowest metastable atomic $1s2s$ $^{1,\,3}$S states from which Interatomic Coulombic Decay (ICD) takes places either between two excited He atoms or between an excited He atom and a Na atom attached to the droplet surface. Four main ICD channels are identified and their time constants are determined by varying the delay between the XUV pulse and a UV pulse that ionizes the initial excited state and thereby quenches ICD. The time constants for the different channels all fall in the range $\sim$1~ps indicating that the ICD dynamics are mainly determined by the droplet environment. A periodic modulation of the transient ICD signals is tentatively attributed to the oscillation of the bubble forming around the localized He excitation. The ICD efficiency depends on the total number of excited states in a droplet rather than the density of excited states pointing to a collective enhancement of ICD. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01905v1-abstract-full').style.display = 'none'; document.getElementById('2203.01905v1-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> 3 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.10950">arXiv:2201.10950</a> <span> [<a href="https://arxiv.org/pdf/2201.10950">pdf</a>, <a href="https://arxiv.org/format/2201.10950">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-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/10.1038/s41586-022-04948-y">10.1038/s41586-022-04948-y <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Studying ultrafast Rabi dynamics with a short-wavelength seeded free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nandi%2C+S">Saikat Nandi</a>, <a href="/search/physics?searchtype=author&query=Olofsson%2C+E">Edvin Olofsson</a>, <a href="/search/physics?searchtype=author&query=Bertolino%2C+M">Mattias Bertolino</a>, <a href="/search/physics?searchtype=author&query=Carlstr%C3%B6m%2C+S">Stefanos Carlstr枚m</a>, <a href="/search/physics?searchtype=author&query=Zapata%2C+F">Felipe Zapata</a>, <a href="/search/physics?searchtype=author&query=Busto%2C+D">David Busto</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Eng-Johnsson%2C+P">Per Eng-Johnsson</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Gallician%2C+G">Guillaume Gallician</a>, <a href="/search/physics?searchtype=author&query=Gisselbrecht%2C+M">Mathieu Gisselbrecht</a>, <a href="/search/physics?searchtype=author&query=Maclot%2C+S">Sylvain Maclot</a>, <a href="/search/physics?searchtype=author&query=Neori%C4%8Di%C4%87%2C+L">Lana Neori膷i膰</a>, <a href="/search/physics?searchtype=author&query=Peschel%2C+J">Jasper Peschel</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin C. Prince</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">Richard J. Squibb</a>, <a href="/search/physics?searchtype=author&query=Zhong%2C+S">Shiyang Zhong</a>, <a href="/search/physics?searchtype=author&query=Demekhin%2C+P+V">Philipp V. Demekhin</a>, <a href="/search/physics?searchtype=author&query=Meyer%2C+M">Michael Meyer</a>, <a href="/search/physics?searchtype=author&query=Miron%2C+C">Catalin Miron</a>, <a href="/search/physics?searchtype=author&query=Badano%2C+L">Laura Badano</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">Miltcho B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a> , et al. (4 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="2201.10950v1-abstract-short" style="display: inline;"> Rabi oscillations are periodic modulations of populations in two-level systems interacting with a time-varying field. They are ubiquitous in physics with applications in different areas such as photonics, nano-electronics, electron microscopy, and quantum information. While the theory developed by Rabi was intended for fermions in gyrating magnetic fields, Autler and Townes realized that it could… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10950v1-abstract-full').style.display = 'inline'; document.getElementById('2201.10950v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.10950v1-abstract-full" style="display: none;"> Rabi oscillations are periodic modulations of populations in two-level systems interacting with a time-varying field. They are ubiquitous in physics with applications in different areas such as photonics, nano-electronics, electron microscopy, and quantum information. While the theory developed by Rabi was intended for fermions in gyrating magnetic fields, Autler and Townes realized that it could also be used to describe coherent light-matter interaction within the rotating wave approximation\cite. Although intense nanometer-wavelength light-sources have been available for more than a decade, Rabi dynamics at such short wavelengths have not been observed directly. Here we show that femtosecond extreme-ultraviolet pulses from a seeded free-electron laser can drive Rabi oscillations between the ground state and an excited state in helium atoms. The measured photoemission signal revealed an Autler-Townes doublet as well as an avoided crossing, phenomena that are both trademarks of quantum optics. Using theoretical analyses that go beyond the strong-field approximation, we found that the ultrafast build-up of the doublet structure follows from a quantum interference effect between resonant and non-resonant photoionization pathways. Given the recent availability of intense attosecond and few-femtosecond extreme-ultraviolet pulses, our results offer opportunities to carry out ultrafast manipulation of coherent processes at short wavelengths using free-electron lasers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10950v1-abstract-full').style.display = 'none'; document.getElementById('2201.10950v1-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 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">38 pages, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 608, 488-493 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2112.03770">arXiv:2112.03770</a> <span> [<a href="https://arxiv.org/pdf/2112.03770">pdf</a>, <a href="https://arxiv.org/ps/2112.03770">ps</a>, <a href="https://arxiv.org/format/2112.03770">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="Optics">physics.optics</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/10.1088/1361-6455/ac5f74">10.1088/1361-6455/ac5f74 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Improved stabilization scheme for extreme ultraviolet quantum interference experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Uhl%2C+D">Daniel Uhl</a>, <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">Andreas Wituschek</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">Marcel Binz</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin Charles Prince</a>, <a href="/search/physics?searchtype=author&query=Cerullo%2C+G">Giulio Cerullo</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Sansone%2C+G">Giuseppe Sansone</a>, <a href="/search/physics?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/physics?searchtype=author&query=Michiels%2C+R">Rupert Michiels</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">Marcel Mudrich</a>, <a href="/search/physics?searchtype=author&query=Piseri%2C+P">Paolo Piseri</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">Richard James Squibb</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Stranges%2C+S">Stefano Stranges</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">Frank Stienkemeier</a>, <a href="/search/physics?searchtype=author&query=Bruder%2C+L">Lukas Bruder</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="2112.03770v3-abstract-short" style="display: inline;"> Interferometric pump-probe experiments in the extreme ultraviolet (XUV) domain are experimentally very challenging due to the high phase stability required between the XUV pulses. Recently, an efficient phase stabilization scheme was introduced for seeded XUV free electron lasers (FELs) combining shot-to-shot phase modulation with lock-in detection. This method stabilized the seed laser beampath o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03770v3-abstract-full').style.display = 'inline'; document.getElementById('2112.03770v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2112.03770v3-abstract-full" style="display: none;"> Interferometric pump-probe experiments in the extreme ultraviolet (XUV) domain are experimentally very challenging due to the high phase stability required between the XUV pulses. Recently, an efficient phase stabilization scheme was introduced for seeded XUV free electron lasers (FELs) combining shot-to-shot phase modulation with lock-in detection. This method stabilized the seed laser beampath on the fundamental ultraviolet wavelength to a high degree. Here, we extend this scheme including the stabilization of the XUV beampath, incorporating phase fluctuations from the FEL high gain harmonic generation process. Our analysis reveals a clear signal improvement with the new method compared to the previous stabilization scheme. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2112.03770v3-abstract-full').style.display = 'none'; document.getElementById('2112.03770v3-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, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 December, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2106.04161">arXiv:2106.04161</a> <span> [<a href="https://arxiv.org/pdf/2106.04161">pdf</a>, <a href="https://arxiv.org/format/2106.04161">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.24.080702">10.1103/PhysRevAccelBeams.24.080702 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Characterization of soft X-ray echo-enabled harmonic generation free-electron laser pulses in the presence of incoherent energy modulations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mirian%2C+N+S">N. S. Mirian</a>, <a href="/search/physics?searchtype=author&query=Perosa%2C+G">G. Perosa</a>, <a href="/search/physics?searchtype=author&query=Hemsing%2C+E">E. Hemsing</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">E. Allaria</a>, <a href="/search/physics?searchtype=author&query=Badano%2C+L">L. Badano</a>, <a href="/search/physics?searchtype=author&query=Cinquegrana%2C+P">P. Cinquegrana</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">M. B. Danailov</a>, <a href="/search/physics?searchtype=author&query=De+Ninno%2C+G">G. De Ninno</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">L. Giannessi</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">G. Penco</a>, <a href="/search/physics?searchtype=author&query=Spampinati%2C+S">S. Spampinati</a>, <a href="/search/physics?searchtype=author&query=Spezzani%2C+C">C. Spezzani</a>, <a href="/search/physics?searchtype=author&query=Roussel%2C+E">E. Roussel</a>, <a href="/search/physics?searchtype=author&query=Ribic%2C+P+R">P. R. Ribic</a>, <a href="/search/physics?searchtype=author&query=Trovo%2C+M">M. Trovo</a>, <a href="/search/physics?searchtype=author&query=Veronese%2C+M">M. Veronese</a>, <a href="/search/physics?searchtype=author&query=Di+Mitri%2C+S">S. Di Mitri</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="2106.04161v1-abstract-short" style="display: inline;"> Echo-enabled harmonic generation free-electron lasers (EEHG FELs) are promising candidates to produce fully coherent soft x-ray pulses by virtue of efficient high harmonic frequency up-conversion from UV lasers. The ultimate spectral limit of EEHG, however, remains unclear, because of the broadening and distortions induced in the output spectrum by residual broadband energy modulations in the elec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.04161v1-abstract-full').style.display = 'inline'; document.getElementById('2106.04161v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2106.04161v1-abstract-full" style="display: none;"> Echo-enabled harmonic generation free-electron lasers (EEHG FELs) are promising candidates to produce fully coherent soft x-ray pulses by virtue of efficient high harmonic frequency up-conversion from UV lasers. The ultimate spectral limit of EEHG, however, remains unclear, because of the broadening and distortions induced in the output spectrum by residual broadband energy modulations in the electron beam. We present a mathematical description of the impact of incoherent (broadband) energy modulations on the bunching spectrum produced by the microbunching instability through both the accelerator and the EEHG line. The model is in agreement with a systematic experimental characterization of the FERMI EEHG FEL in the photon energy range $130-210$ eV. We find that amplification of electron beam energy distortions primarily in the EEHG dispersive sections explains an observed reduction of the FEL spectral brightness that is proportional to the EEHG harmonic number. Local maxima of the FEL spectral brightness and of the spectral stability are found for a suitable balance of the dispersive sections' strength and the first seed laser pulse energy. Such characterization provides a benchmark for user experiments and future EEHG implementations designed to reach shorter wavelengths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2106.04161v1-abstract-full').style.display = 'none'; document.getElementById('2106.04161v1-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, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY 21-090 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Accel. Beams 24, 080702 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.06701">arXiv:2105.06701</a> <span> [<a href="https://arxiv.org/pdf/2105.06701">pdf</a>, <a href="https://arxiv.org/format/2105.06701">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/10.1016/j.physleta.2021.127401">10.1016/j.physleta.2021.127401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the muon transfer rate from muonic hydrogen to oxygen in the range 70-336 K </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Sbrizzi%2C+A">A. Sbrizzi</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchio%2C+C">C. De Vecchio</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Labanti%2C+C">C. Labanti</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</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="2105.06701v1-abstract-short" style="display: inline;"> The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.06701v1-abstract-full').style.display = 'inline'; document.getElementById('2105.06701v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.06701v1-abstract-full" style="display: none;"> The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatures. The 2018 results confirm the temperature dependence of the muon transfer rate observed in 2016 and sets firm ground for comparison with the theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.06701v1-abstract-full').style.display = 'none'; document.getElementById('2105.06701v1-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> 14 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.01918">arXiv:2105.01918</a> <span> [<a href="https://arxiv.org/pdf/2105.01918">pdf</a>, <a href="https://arxiv.org/format/2105.01918">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</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.127.093201">10.1103/PhysRevLett.127.093201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Collective enhancement of above threshold ionization by resonantly excited helium nanodroplets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Michiels%2C+R">R. Michiels</a>, <a href="/search/physics?searchtype=author&query=Abu-samha%2C+M">M. Abu-samha</a>, <a href="/search/physics?searchtype=author&query=Madsen%2C+L+B">L. B. Madsen</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">M. Binz</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">U. Bangert</a>, <a href="/search/physics?searchtype=author&query=Bruder%2C+L">L. Bruder</a>, <a href="/search/physics?searchtype=author&query=Duim%2C+R">R. Duim</a>, <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">A. Wituschek</a>, <a href="/search/physics?searchtype=author&query=LaForge%2C+A+C">A. C. LaForge</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">R. J. Squibb</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">R. Feifel</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">C. Callegari</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">M. Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Manfredda%2C+M">M. Manfredda</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">O. Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">K. C. Prince</a>, <a href="/search/physics?searchtype=author&query=Rebernik%2C+P">P. Rebernik</a>, <a href="/search/physics?searchtype=author&query=Zangrando%2C+M">M. Zangrando</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">F. Stienkemeier</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">M. Mudrich</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="2105.01918v1-abstract-short" style="display: inline;"> Clusters and nanodroplets hold the promise of enhancing high-order nonlinear optical effects due to their high local density. However, only moderate enhancement has been demonstrated to date. Here, we report the observation of energetic electrons generated by above-threshold ionization (ATI) of helium (He) nanodroplets which are resonantly excited by ultrashort extreme ultraviolet (XUV) free-elect… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.01918v1-abstract-full').style.display = 'inline'; document.getElementById('2105.01918v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.01918v1-abstract-full" style="display: none;"> Clusters and nanodroplets hold the promise of enhancing high-order nonlinear optical effects due to their high local density. However, only moderate enhancement has been demonstrated to date. Here, we report the observation of energetic electrons generated by above-threshold ionization (ATI) of helium (He) nanodroplets which are resonantly excited by ultrashort extreme ultraviolet (XUV) free-electron laser pulses and subsequently ionized by near-infrared (NIR) or near-ultraviolet (UV) pulses. The electron emission due to high-order ATI is enhanced by several orders of magnitude compared to He atoms. The crucial dependence of the ATI intensities with the number of excitations in the droplets suggests a local collective enhancement effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.01918v1-abstract-full').style.display = 'none'; document.getElementById('2105.01918v1-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> 5 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 127, 093201 (2021) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2103.05948">arXiv:2103.05948</a> <span> [<a href="https://arxiv.org/pdf/2103.05948">pdf</a>, <a href="https://arxiv.org/format/2103.05948">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</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/10.1039/D1CP01041G">10.1039/D1CP01041G <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unravelling the Full Relaxation Dynamics of Superexcited Helium Nanodroplets </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Asmussen%2C+J+D">Jakob D. Asmussen</a>, <a href="/search/physics?searchtype=author&query=Michiels%2C+R">Rupert Michiels</a>, <a href="/search/physics?searchtype=author&query=Dulitz%2C+K">Katrin Dulitz</a>, <a href="/search/physics?searchtype=author&query=Ngai%2C+A">Aaron Ngai</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Barranco%2C+M">Manuel Barranco</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">Marcel Binz</a>, <a href="/search/physics?searchtype=author&query=Bruder%2C+L">Lukas Bruder</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Eloranta%2C+J">Jussi Eloranta</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=Pi%2C+M">Marti Pi</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin C. Prince</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">Richard J. Squibb</a>, <a href="/search/physics?searchtype=author&query=Uhl%2C+D">Daniel Uhl</a>, <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">Andreas Wituschek</a>, <a href="/search/physics?searchtype=author&query=Zangrando%2C+M">Marco Zangrando</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">Frank Stienkemeier</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">Marcel Mudrich</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="2103.05948v1-abstract-short" style="display: inline;"> The relaxation dynamics of superexcited superfluid He nanodroplets is thoroughly investigated by means of extreme-ultraviolet (XUV) femtosecond electron and ion spectroscopy complemented by time-dependent density functional theory (TDDFT). Three main paths leading to the emission of electrons and ions are identified: Droplet autoionization, pump-probe photoionization, and autoionization induced by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.05948v1-abstract-full').style.display = 'inline'; document.getElementById('2103.05948v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2103.05948v1-abstract-full" style="display: none;"> The relaxation dynamics of superexcited superfluid He nanodroplets is thoroughly investigated by means of extreme-ultraviolet (XUV) femtosecond electron and ion spectroscopy complemented by time-dependent density functional theory (TDDFT). Three main paths leading to the emission of electrons and ions are identified: Droplet autoionization, pump-probe photoionization, and autoionization induced by re-excitation of droplets relaxing into levels below the droplet ionization threshold. The most abundant product of both droplet autoionization and photoionization is He$_2^+$, whereas the delayed appearance of He$^+$ is indicative of the ejection of excited He atoms from the droplets. The state-resolved time-dependent photoelectron spectra reveal that intermediate excited states of the droplets are populated in the course of the relaxation, terminating in the lowest-lying metastable singlet and triplet He atomic states. The slightly faster relaxation of the triplet state compared to the singlet state is in agreement with the simulation showing faster formation of a bubble around a He atom in the triplet state. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2103.05948v1-abstract-full').style.display = 'none'; document.getElementById('2103.05948v1-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, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2012.09714">arXiv:2012.09714</a> <span> [<a href="https://arxiv.org/pdf/2012.09714">pdf</a>, <a href="https://arxiv.org/format/2012.09714">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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/10.1038/s41586-020-2005-6">10.1038/s41586-020-2005-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Attosecond Pulse-shaping using a seeded free-electron laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Maroju%2C+P+K">Praveen Kumar Maroju</a>, <a href="/search/physics?searchtype=author&query=Grazioli%2C+C">Cesare Grazioli</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Moioli%2C+M">Matteo Moioli</a>, <a href="/search/physics?searchtype=author&query=Ertel%2C+D">Dominik Ertel</a>, <a href="/search/physics?searchtype=author&query=Ahmadi%2C+H">Hamed Ahmadi</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Finetti%2C+P">Paola Finetti</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">Enrico Allaria</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=De+Ninno%2C+G">Giovanni De Ninno</a>, <a href="/search/physics?searchtype=author&query=Spezzani%2C+C">Carlo Spezzani</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">Giuseppe Penco</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">Alexander Demidovich</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Borghes%2C+R">Roberto Borghes</a>, <a href="/search/physics?searchtype=author&query=Kourousias%2C+G">Georgios Kourousias</a>, <a href="/search/physics?searchtype=author&query=Reis%2C+C+E+S+D">Carlos Eduardo Sanches Dos Reis</a>, <a href="/search/physics?searchtype=author&query=Bill%C3%A9%2C+F">Fulvio Bill茅</a>, <a href="/search/physics?searchtype=author&query=Lutman%2C+A+A">Alberto A. Lutman</a>, <a href="/search/physics?searchtype=author&query=Squibb%2C+R+J">Richard J. Squibb</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Carpeggiani%2C+P">Paolo Carpeggiani</a>, <a href="/search/physics?searchtype=author&query=Reduzzi%2C+M">Maurizio Reduzzi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+T">Tommaso Mazza</a> , et al. (19 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="2012.09714v1-abstract-short" style="display: inline;"> Attosecond pulses are fundamental for the investigation of valence and core-electron dynamics on their natural timescale. At present the reproducible generation and characterisation of attosecond waveforms has been demonstrated only through the process of high-order harmonic generation. Several methods for the shaping of attosecond waveforms have been proposed, including metallic filters, multilay… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.09714v1-abstract-full').style.display = 'inline'; document.getElementById('2012.09714v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2012.09714v1-abstract-full" style="display: none;"> Attosecond pulses are fundamental for the investigation of valence and core-electron dynamics on their natural timescale. At present the reproducible generation and characterisation of attosecond waveforms has been demonstrated only through the process of high-order harmonic generation. Several methods for the shaping of attosecond waveforms have been proposed, including metallic filters, multilayer mirrors and manipulation of the driving field. However, none of these approaches allow for the flexible manipulation of the temporal characteristics of the attosecond waveforms, and they suffer from the low conversion efficiency of the high-order harmonic generation process. Free Electron Lasers, on the contrary, deliver femtosecond, extreme ultraviolet and X-ray pulses with energies ranging from tens of $\mathrm渭$J to a few mJ. Recent experiments have shown that they can generate sub-fs spikes, but with temporal characteristics that change shot-to-shot. Here we show the first demonstration of reproducible generation of high energy ($\mathrm渭$J level) attosecond waveforms using a seeded Free Electron Laser. We demonstrate amplitude and phase manipulation of the harmonic components of an attosecond pulse train in combination with a novel approach for its temporal reconstruction. The results presented here open the way to perform attosecond time-resolved experiments with Free Electron Lasers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2012.09714v1-abstract-full').style.display = 'none'; document.getElementById('2012.09714v1-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 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature 578 386-391 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.00252">arXiv:2010.00252</a> <span> [<a href="https://arxiv.org/pdf/2010.00252">pdf</a>, <a href="https://arxiv.org/format/2010.00252">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> <p class="title is-5 mathjax"> Microbunching Instability Characterisation via Temporally Modulated Laser Pulses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brynes%2C+A+D">A. D. Brynes</a>, <a href="/search/physics?searchtype=author&query=Akkermans%2C+I">I. Akkermans</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">E. Allaria</a>, <a href="/search/physics?searchtype=author&query=Badano%2C+L">L. Badano</a>, <a href="/search/physics?searchtype=author&query=Brussaard%2C+S">S. Brussaard</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">A. Demidovich</a>, <a href="/search/physics?searchtype=author&query=De+Ninno%2C+G">G. De Ninno</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">L. Giannessi</a>, <a href="/search/physics?searchtype=author&query=Mirian%2C+N+S">N. S. Mirian</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">G. Penco</a>, <a href="/search/physics?searchtype=author&query=Perosa%2C+G">G. Perosa</a>, <a href="/search/physics?searchtype=author&query=Ribi%C4%8D%2C+P+R">P. Rebernik Ribi膷</a>, <a href="/search/physics?searchtype=author&query=Roussel%2C+E">E. Roussel</a>, <a href="/search/physics?searchtype=author&query=Setija%2C+I">I. Setija</a>, <a href="/search/physics?searchtype=author&query=Smorenburg%2C+P">P. Smorenburg</a>, <a href="/search/physics?searchtype=author&query=Spampinati%2C+S">S. Spampinati</a>, <a href="/search/physics?searchtype=author&query=Spezzani%2C+C">C. Spezzani</a>, <a href="/search/physics?searchtype=author&query=Trov%C3%B2%2C+M">M. Trov貌</a>, <a href="/search/physics?searchtype=author&query=Williams%2C+P+H">P. H. Williams</a>, <a href="/search/physics?searchtype=author&query=Wolski%2C+A">A. Wolski</a>, <a href="/search/physics?searchtype=author&query=Di+Mitri%2C+S">S. Di Mitri</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="2010.00252v1-abstract-short" style="display: inline;"> High-brightness electron bunches, such as those generated and accelerated in free-electron lasers (FELs), can develop small-scale structure in the longitudinal phase space. This causes variations in the slice energy spread and current profile of the bunch which then undergo amplification, in an effect known as the microbunching instability. By imposing energy spread modulations on the bunch in the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.00252v1-abstract-full').style.display = 'inline'; document.getElementById('2010.00252v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.00252v1-abstract-full" style="display: none;"> High-brightness electron bunches, such as those generated and accelerated in free-electron lasers (FELs), can develop small-scale structure in the longitudinal phase space. This causes variations in the slice energy spread and current profile of the bunch which then undergo amplification, in an effect known as the microbunching instability. By imposing energy spread modulations on the bunch in the low-energy section of an accelerator, using an undulator and a modulated laser pulse in the centre of a dispersive chicane, it is possible tomanipulate the bunch longitudinal phase space. This allows for the control and study of the instability in unprecedented detail. We report measurements and analysis of such modulated electron bunches in the 2Dspectro-temporal domain at the FERMI FEL, for three different bunch compression schemes. We also perform corresponding simulations of these experiments and show that the codes are indeed able to reproduce the measurements across a wide spectral range. This detailed experimental verification of the ability of codes to capture the essential beam dynamics of the microbunching instability will benefit the design and performance of future FELs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.00252v1-abstract-full').style.display = 'none'; document.getElementById('2010.00252v1-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 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </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, 14 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/2007.12423">arXiv:2007.12423</a> <span> [<a href="https://arxiv.org/pdf/2007.12423">pdf</a>, <a href="https://arxiv.org/format/2007.12423">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="Optics">physics.optics</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/10.1364/OE.401249">10.1364/OE.401249 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-Gain Harmonic Generation with temporally overlapping seed pulses and application to ultrafast spectroscopy </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">Andreas Wituschek</a>, <a href="/search/physics?searchtype=author&query=Bruder%2C+L">Lukas Bruder</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">Enrico Allaria</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">Marcel Binz</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Cinquegrana%2C+P">Paolo Cinquegrana</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">Alexander Demidovich</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/physics?searchtype=author&query=Michiels%2C+R">Rupert Michiels</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">Marcel Mudrich</a>, <a href="/search/physics?searchtype=author&query=Nikolov%2C+I">Ivaylo Nikolov</a>, <a href="/search/physics?searchtype=author&query=Piseri%2C+P">Paolo Piseri</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin Charles Prince</a>, <a href="/search/physics?searchtype=author&query=Przystawik%2C+A">Andreas Przystawik</a>, <a href="/search/physics?searchtype=author&query=Ribi%C4%8D%2C+P+R">Primo啪 Rebernic Ribi膷</a>, <a href="/search/physics?searchtype=author&query=Sigalotti%2C+P">Paolo Sigalotti</a>, <a href="/search/physics?searchtype=author&query=Stranges%2C+S">Stefano Stranges</a>, <a href="/search/physics?searchtype=author&query=Uhl%2C+D">Daniel Uhl</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=Stienkemeier%2C+F">Frank Stienkemeier</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="2007.12423v2-abstract-short" style="display: inline;"> Collinear double-pulse seeding of the High-Gain Harmonic Generation (HGHG) process in a free-electron laser (FEL) is a promising approach to facilitate various coherent nonlinear spectroscopy schemes in the extreme ultraviolet (XUV) spectral range. However, in collinear arrangements using a single nonlinear medium, temporally overlapping seed pulses may introduce nonlinear mixing signals that comp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.12423v2-abstract-full').style.display = 'inline'; document.getElementById('2007.12423v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.12423v2-abstract-full" style="display: none;"> Collinear double-pulse seeding of the High-Gain Harmonic Generation (HGHG) process in a free-electron laser (FEL) is a promising approach to facilitate various coherent nonlinear spectroscopy schemes in the extreme ultraviolet (XUV) spectral range. However, in collinear arrangements using a single nonlinear medium, temporally overlapping seed pulses may introduce nonlinear mixing signals that compromise the experiment at short time delays. Here, we investigate these effects in detail by extending the analysis described in a recent publication (Wituschek et al., Nat. Commun., 11, 883, 2020). High-order fringe-resolved autocorrelation and wave-packet interferometry experiments at photon energies > $23\,$eV are performed, accompanied by numerical simulations. It turns out that both the autocorrelation and the wave-packet interferometry data are very sensitive to saturation effects and can thus be used to characterize saturation in the HGHG process. Our results further imply that time-resolved spectroscopy experiments are feasible even for time delays smaller than the seed pulse duration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.12423v2-abstract-full').style.display = 'none'; document.getElementById('2007.12423v2-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 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </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">This is accepted version of the article. The Version of Record is available online at https://doi.org/10.1364/OE.401249</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Optics Express Vol. 28, Issue 20, pp. 29976-29990 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.07112">arXiv:1906.07112</a> <span> [<a href="https://arxiv.org/pdf/1906.07112">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="Atomic and Molecular Clusters">physics.atm-clus</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-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/s41467-020-14721-2">10.1038/s41467-020-14721-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tracking Attosecond Electronic Coherences Using Phase-Manipulated Extreme Ultraviolet Pulses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wituschek%2C+A">Andreas Wituschek</a>, <a href="/search/physics?searchtype=author&query=Bruder%2C+L">Lukas Bruder</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">Enrico Allaria</a>, <a href="/search/physics?searchtype=author&query=Bangert%2C+U">Ulrich Bangert</a>, <a href="/search/physics?searchtype=author&query=Binz%2C+M">Marcel Binz</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</a>, <a href="/search/physics?searchtype=author&query=Cerullo%2C+G">Giulio Cerullo</a>, <a href="/search/physics?searchtype=author&query=Cinquegrana%2C+P">Paolo Cinquegrana</a>, <a href="/search/physics?searchtype=author&query=Gianessi%2C+L">Luca Gianessi</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">Alexander Demidovich</a>, <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Drabbels%2C+M">Marcel Drabbels</a>, <a href="/search/physics?searchtype=author&query=Feifel%2C+R">Raimund Feifel</a>, <a href="/search/physics?searchtype=author&query=Laarmann%2C+T">Tim Laarmann</a>, <a href="/search/physics?searchtype=author&query=Michiels%2C+R">Rupert Michiels</a>, <a href="/search/physics?searchtype=author&query=Mirian%2C+N+S">Najmeh Sadat Mirian</a>, <a href="/search/physics?searchtype=author&query=Mudrich%2C+M">Marcel Mudrich</a>, <a href="/search/physics?searchtype=author&query=Nikolov%2C+I">Ivaylo Nikolov</a>, <a href="/search/physics?searchtype=author&query=O%27Shea%2C+F+H">Finn H. O'Shea</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">Giuseppe Penco</a>, <a href="/search/physics?searchtype=author&query=Piseri%2C+P">Paolo Piseri</a>, <a href="/search/physics?searchtype=author&query=Plekan%2C+O">Oksana Plekan</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin Charles Prince</a>, <a href="/search/physics?searchtype=author&query=Przystawik%2C+A">Andreas Przystawik</a> , et al. (9 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="1906.07112v3-abstract-short" style="display: inline;"> The recent development of ultrafast extreme ultraviolet (XUV) coherent light sources bears great potential for a better understanding of the structure and dynamics of matter. Promising routes are advanced coherent control and nonlinear spectroscopy schemes in the XUV energy range, yielding unprecedented spatial and temporal resolution. However, their implementation has been hampered by the experim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.07112v3-abstract-full').style.display = 'inline'; document.getElementById('1906.07112v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.07112v3-abstract-full" style="display: none;"> The recent development of ultrafast extreme ultraviolet (XUV) coherent light sources bears great potential for a better understanding of the structure and dynamics of matter. Promising routes are advanced coherent control and nonlinear spectroscopy schemes in the XUV energy range, yielding unprecedented spatial and temporal resolution. However, their implementation has been hampered by the experimental challenge of generating XUV pulse sequences with precisely controlled timing and phase properties. In particular, direct control and manipulation of the phase of individual pulses within a XUV pulse sequence opens exciting possibilities for coherent control and multidimensional spectroscopy, but has not been accomplished. Here, we overcome these constraints in a highly time-stabilized and phase-modulated XUV-pump, XUV-probe experiment, which directly probes the evolution and dephasing of an inner subshell electronic coherence. This approach, avoiding any XUV optics for direct pulse manipulation, opens up extensive applications of advanced nonlinear optics and spectroscopy at XUV wavelengths. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.07112v3-abstract-full').style.display = 'none'; document.getElementById('1906.07112v3-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 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">This is the accepted version of the article. The Version of Record is available online at 10.1038/s41467-020-14721-2</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications volume 11, 883 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.02049">arXiv:1905.02049</a> <span> [<a href="https://arxiv.org/pdf/1905.02049">pdf</a>, <a href="https://arxiv.org/ps/1905.02049">ps</a>, <a href="https://arxiv.org/format/1905.02049">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="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.physleta.2020.126667">10.1016/j.physleta.2020.126667 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of the temperature dependence of muon transfer rate from muonic hydrogen atoms to oxygen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Morales%2C+H+C">H. Cabrera Morales</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchi%2C+C">C. De Vecchi</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">E. Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Labanti%2C+C">C. Labanti</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</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="1905.02049v3-abstract-short" style="display: inline;"> We report the first measurement of the temperature dependence of muon transfer rate from $渭$p atoms to oxygen between 100 and 300 K. Data were obtained from the X-ray spectra of delayed events in gaseous target H$_2$/O$_2$ exposed to a muon beam. Based on the data, we determined the muon transfer energy dependence up to 0.1 eV, showing an 8-fold increase in contrast with the predictions of constan… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02049v3-abstract-full').style.display = 'inline'; document.getElementById('1905.02049v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.02049v3-abstract-full" style="display: none;"> We report the first measurement of the temperature dependence of muon transfer rate from $渭$p atoms to oxygen between 100 and 300 K. Data were obtained from the X-ray spectra of delayed events in gaseous target H$_2$/O$_2$ exposed to a muon beam. Based on the data, we determined the muon transfer energy dependence up to 0.1 eV, showing an 8-fold increase in contrast with the predictions of constant rate in the low energy limit. This work set constraints on theoretical models of muon transfer, and is of fundamental importance for the measurement of the hyperfine splitting of $渭$p by the FAMU collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02049v3-abstract-full').style.display = 'none'; document.getElementById('1905.02049v3-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> 14 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 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">11 pages, 4 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. A, 384/26 (2020) 126667 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.07281">arXiv:1808.07281</a> <span> [<a href="https://arxiv.org/pdf/1808.07281">pdf</a>, <a href="https://arxiv.org/format/1808.07281">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic and Molecular Clusters">physics.atm-clus</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/10.1039/C7CP01812F">10.1039/C7CP01812F <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Impulsive laser-induced alignment of OCS molecules at FERMI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Di+Fraia%2C+M">Michele Di Fraia</a>, <a href="/search/physics?searchtype=author&query=Finetti%2C+P">Paola Finetti</a>, <a href="/search/physics?searchtype=author&query=Richter%2C+R">Robert Richter</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">Kevin C. Prince</a>, <a href="/search/physics?searchtype=author&query=Wiese%2C+J">Joss Wiese</a>, <a href="/search/physics?searchtype=author&query=Devetta%2C+M">Michele Devetta</a>, <a href="/search/physics?searchtype=author&query=Negro%2C+M">Matteo Negro</a>, <a href="/search/physics?searchtype=author&query=Vozzi%2C+C">Caterina Vozzi</a>, <a href="/search/physics?searchtype=author&query=Ciriolo%2C+A+G">Anna G. Ciriolo</a>, <a href="/search/physics?searchtype=author&query=Pusala%2C+A">Aditya Pusala</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">Alexander Demidovich</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">Miltcho B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Karamatskos%2C+E+T">Evangelos T. Karamatskos</a>, <a href="/search/physics?searchtype=author&query=Trippel%2C+S">Sebastian Trippel</a>, <a href="/search/physics?searchtype=author&query=K%C3%BCpper%2C+J">Jochen K眉pper</a>, <a href="/search/physics?searchtype=author&query=Callegari%2C+C">Carlo Callegari</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="1808.07281v2-abstract-short" style="display: inline;"> We demonstrate the experimental realization of impulsive alignment of carbonyl sulfide (OCS) molecules at the Low Density Matter Beamline (LDM) at the free-electron laser FERMI. OCS molecules in a molecular beam were impulsively aligned using 200 fs pulses from a near-infrared laser. The alignment was probed through time-delayed ionization above the sulphur 2p edge, resulting in multiple ionizatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.07281v2-abstract-full').style.display = 'inline'; document.getElementById('1808.07281v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.07281v2-abstract-full" style="display: none;"> We demonstrate the experimental realization of impulsive alignment of carbonyl sulfide (OCS) molecules at the Low Density Matter Beamline (LDM) at the free-electron laser FERMI. OCS molecules in a molecular beam were impulsively aligned using 200 fs pulses from a near-infrared laser. The alignment was probed through time-delayed ionization above the sulphur 2p edge, resulting in multiple ionization via Auger decay and subsequent Coulomb explosion of the molecules. The ionic fragments were collected using a time-of-flight mass spectrometer and the analysis of ion-ion covariance maps confirmed the correlation between fragments after Coulomb explosion. The analysis of the CO+ and S+ channels allowed us to extract the rotational dynamics, which is in agreement with our theoretical description as well as with previous experiments. This result opens the way for a new class of experiments at LDM within the field of coherent control of molecules with the possibilities that a precisely synchronized optical-pump XUV-probe laser setup like FERMI can offer. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.07281v2-abstract-full').style.display = 'none'; document.getElementById('1808.07281v2-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 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </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, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Chem.Chem.Phys., 2017, 19, 19733 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.06380">arXiv:1808.06380</a> <span> [<a href="https://arxiv.org/pdf/1808.06380">pdf</a>, <a href="https://arxiv.org/ps/1808.06380">ps</a>, <a href="https://arxiv.org/format/1808.06380">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="Data Analysis, Statistics and Probability">physics.data-an</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/10.1088/1742-6596/1138/1/012017">10.1088/1742-6596/1138/1/012017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> FAMU: study of the energy dependent transfer rate $螞_{渭p \rightarrow 渭O}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">E. Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">A. Rachevski</a>, <a href="/search/physics?searchtype=author&query=Stoychev%2C+L">L. Stoychev</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E">E. Vallazza</a>, <a href="/search/physics?searchtype=author&query=Zampa%2C+G">G. Zampa</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">J. Niemela</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">G. Baccolo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">A. Curioni</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+R">R. Mazza</a>, <a href="/search/physics?searchtype=author&query=Moretti%2C+M">M. Moretti</a> , et al. (31 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="1808.06380v2-abstract-short" style="display: inline;"> The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $螖E_{hfs}(渭^-p)1S$. The physical process behind this experiment is the following: $渭p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $螖E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.06380v2-abstract-full').style.display = 'inline'; document.getElementById('1808.06380v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.06380v2-abstract-full" style="display: none;"> The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $螖E_{hfs}(渭^-p)1S$. The physical process behind this experiment is the following: $渭p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $螖E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules, the $渭p$ is quickly de-excited and accelerated by $\sim2/3$ of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the $渭Z$ formed by muon transfer $(渭p) +Z \rightarrow (渭Z)^*+p$, a reaction whose rate depends on the $渭p$ kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the $(渭Z)^*$ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen ($螞_{渭p \rightarrow 渭O}$), precisely measured for the first time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.06380v2-abstract-full').style.display = 'none'; document.getElementById('1808.06380v2-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 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </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">11 pages, 4 figures, published on Journal of Physics: Conference Series, proc. of International Conference on Precision Physics of Simple Atomic Systems - PSAS2018. arXiv admin note: text overlap with arXiv:1708.03172</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. 1138 012017 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.08177">arXiv:1807.08177</a> <span> [<a href="https://arxiv.org/pdf/1807.08177">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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/s41467-018-06743-8">10.1038/s41467-018-06743-8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Seeded x-ray free-electron laser generating radiation with laser statistical properties </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gorobtsov%2C+O+Y">O. Yu. Gorobtsov</a>, <a href="/search/physics?searchtype=author&query=Mercurio%2C+G">G. Mercurio</a>, <a href="/search/physics?searchtype=author&query=Capotondi%2C+F">F. Capotondi</a>, <a href="/search/physics?searchtype=author&query=Skopintsev%2C+P">P. Skopintsev</a>, <a href="/search/physics?searchtype=author&query=Lazarev%2C+S">S. Lazarev</a>, <a href="/search/physics?searchtype=author&query=Zaluzhnyy%2C+I+A">I. A. Zaluzhnyy</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Dell%60Angela%2C+M">M. Dell`Angela</a>, <a href="/search/physics?searchtype=author&query=Manfredda%2C+M">M. Manfredda</a>, <a href="/search/physics?searchtype=author&query=Pedersoli%2C+E">E. Pedersoli</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">L. Giannessi</a>, <a href="/search/physics?searchtype=author&query=Kiskinova%2C+M">M. Kiskinova</a>, <a href="/search/physics?searchtype=author&query=Prince%2C+K+C">K. C. Prince</a>, <a href="/search/physics?searchtype=author&query=Wurth%2C+W">W. Wurth</a>, <a href="/search/physics?searchtype=author&query=Vartanyants%2C+I+A">I. A. Vartanyants</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="1807.08177v1-abstract-short" style="display: inline;"> The invention of optical lasers led to a revolution in the field of optics and even to the creation of completely new fields of research such as quantum optics. The reason was their unique statistical and coherence properties. The newly emerging, short-wavelength free-electron lasers (FELs) are sources of very bright coherent extreme-ultraviolet (XUV) and x-ray radiation with pulse durations on th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.08177v1-abstract-full').style.display = 'inline'; document.getElementById('1807.08177v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.08177v1-abstract-full" style="display: none;"> The invention of optical lasers led to a revolution in the field of optics and even to the creation of completely new fields of research such as quantum optics. The reason was their unique statistical and coherence properties. The newly emerging, short-wavelength free-electron lasers (FELs) are sources of very bright coherent extreme-ultraviolet (XUV) and x-ray radiation with pulse durations on the order of femtoseconds, and are presently considered to be laser sources at these energies. Most existing FELs are highly spatially coherent but in spite of their name, they behave statistically as chaotic sources. Here, we demonstrate experimentally, by combining Hanbury Brown and Twiss (HBT) interferometry with spectral measurements that the seeded XUV FERMI FEL-2 source does indeed behave statistically as a laser. The first steps have been taken towards exploiting the first-order coherence of FELs, and the present work opens the way to quantum optics experiments that strongly rely on high-order statistical properties of the radiation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.08177v1-abstract-full').style.display = 'none'; document.getElementById('1807.08177v1-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 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </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">24 pages, 10 figures, 37 references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nature Communications, 9, 4498 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1805.05702">arXiv:1805.05702</a> <span> [<a href="https://arxiv.org/pdf/1805.05702">pdf</a>, <a href="https://arxiv.org/format/1805.05702">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/10.1088/1367-2630/aad21d">10.1088/1367-2630/aad21d <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Beyond the Limits of 1D Coherent Synchrotron Radiation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Brynes%2C+A+D">A. D. Brynes</a>, <a href="/search/physics?searchtype=author&query=Smorenburg%2C+P">P. Smorenburg</a>, <a href="/search/physics?searchtype=author&query=Akkermans%2C+I">I. Akkermans</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">E. Allaria</a>, <a href="/search/physics?searchtype=author&query=Badano%2C+L">L. Badano</a>, <a href="/search/physics?searchtype=author&query=Brussaard%2C+S">S. Brussaard</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">A. Demidovich</a>, <a href="/search/physics?searchtype=author&query=De+Ninno%2C+G">G. De Ninno</a>, <a href="/search/physics?searchtype=author&query=Gauthier%2C+D">D. Gauthier</a>, <a href="/search/physics?searchtype=author&query=Gaio%2C+G">G. Gaio</a>, <a href="/search/physics?searchtype=author&query=van+der+Geer%2C+S+B">S. B. van der Geer</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">L. Giannessi</a>, <a href="/search/physics?searchtype=author&query=de+Loos%2C+M+J">M. J. de Loos</a>, <a href="/search/physics?searchtype=author&query=Mirian%2C+N+S">N. S. Mirian</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">G. Penco</a>, <a href="/search/physics?searchtype=author&query=Rebernik%2C+P">P. Rebernik</a>, <a href="/search/physics?searchtype=author&query=Rossi%2C+F">F. Rossi</a>, <a href="/search/physics?searchtype=author&query=Setija%2C+I">I. Setija</a>, <a href="/search/physics?searchtype=author&query=Spampinati%2C+S">S. Spampinati</a>, <a href="/search/physics?searchtype=author&query=Spezzani%2C+C">C. Spezzani</a>, <a href="/search/physics?searchtype=author&query=Trov%C3%B2%2C+M">M. Trov貌</a>, <a href="/search/physics?searchtype=author&query=Williams%2C+P+H">P. H. Williams</a>, <a href="/search/physics?searchtype=author&query=DiMitri%2C+S">S. DiMitri</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="1805.05702v1-abstract-short" style="display: inline;"> An understanding of collective effects is of fundamental importance for the design and optimisation of the performance of modern accelerators. In particular, the design of an accelerator with strict requirements on the beam quality, such as a free electron laser (FEL), is highly dependent on a correspondence between simulation, theory and experiments in order to correctly account for the effect of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.05702v1-abstract-full').style.display = 'inline'; document.getElementById('1805.05702v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1805.05702v1-abstract-full" style="display: none;"> An understanding of collective effects is of fundamental importance for the design and optimisation of the performance of modern accelerators. In particular, the design of an accelerator with strict requirements on the beam quality, such as a free electron laser (FEL), is highly dependent on a correspondence between simulation, theory and experiments in order to correctly account for the effect of coherent synchrotron radiation (CSR), and other collective effects. A traditional approach in accelerator simulation codes is to utilise an analytic one-dimensional approximation to the CSR force. We present an extension of the 1D CSR theory in order to correctly account for the CSR force at the entrance and exit of a bending magnet. A limited range of applicability to this solution, in particular in bunches with a large transverse spot size or offset from the nominal axis, is recognised. More recently developed codes calculate the CSR effect in dispersive regions directly from the Lienard-Wiechert potentials, albeit with approximations to improve the computational time. A new module of the General Particle Tracer (GPT) code was developed for simulating the effects of CSR, and benchmarked against other codes. We experimentally demonstrate departure from the commonly used 1D CSR theory for more extreme bunch length compression scenarios at the FERMI FEL facility. Better agreement is found between experimental data and the codes which account for the transverse extent of the bunch, particularly in more extreme compression scenarios. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1805.05702v1-abstract-full').style.display = 'none'; document.getElementById('1805.05702v1-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> 15 May, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2018. </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, 19 figures, submitted to New J. Phys</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.03172">arXiv:1708.03172</a> <span> [<a href="https://arxiv.org/pdf/1708.03172">pdf</a>, <a href="https://arxiv.org/ps/1708.03172">ps</a>, <a href="https://arxiv.org/format/1708.03172">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="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> First FAMU observation of muon transfer from mu-p atoms to higher-Z elements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">Emiliano Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">Valter Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Carbone%2C+R">Rita Carbone</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">Elena Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">Komlan Segbeya Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">Daniele Guffanti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">Cecilia Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">Alexandre Rachevski</a>, <a href="/search/physics?searchtype=author&query=Stoychev%2C+L">Lyubomir Stoychev</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E+S">Erik Silvio Vallazza</a>, <a href="/search/physics?searchtype=author&query=Zampa%2C+G">Gianluigi Zampa</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">Joseph Niemela</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">Katsuhiko Ishida</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">Giovanni Baccolo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">Roberto Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">Roberto Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">Maurizio Bonesini</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">Francesco Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">Massimiliano Clemenza</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">Alessandro Curioni</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">Valter Maggi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+R">Roberto Mazza</a> , et al. (32 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="1708.03172v3-abstract-short" style="display: inline;"> The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Lab… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.03172v3-abstract-full').style.display = 'inline'; document.getElementById('1708.03172v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.03172v3-abstract-full" style="display: none;"> The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, UK). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited mu-p atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the mu-p currently under way. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.03172v3-abstract-full').style.display = 'none'; document.getElementById('1708.03172v3-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> 15 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </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, 3 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.01572">arXiv:1604.01572</a> <span> [<a href="https://arxiv.org/pdf/1604.01572">pdf</a>, <a href="https://arxiv.org/ps/1604.01572">ps</a>, <a href="https://arxiv.org/format/1604.01572">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/10.1088/1748-0221/11/05/P05007">10.1088/1748-0221/11/05/P05007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">G. Baccolo</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Campana%2C+R">R. Campana</a>, <a href="/search/physics?searchtype=author&query=Carbone%2C+R">R. Carbone</a>, <a href="/search/physics?searchtype=author&query=Cervi%2C+T">T. Cervi</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">A. Curioni</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=D%27Antone%2C+I">I. D'Antone</a>, <a href="/search/physics?searchtype=author&query=De%2C+A">A. De</a>, <a href="/search/physics?searchtype=author&query=De%2C+C">C. De</a>, <a href="/search/physics?searchtype=author&query=De%2C+M">M. De</a>, <a href="/search/physics?searchtype=author&query=Furini%2C+M">M. Furini</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadejisso-Tossou%2C+K">K. Gadejisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Iaciofano%2C+A">A. Iaciofano</a> , et al. (30 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="1604.01572v2-abstract-short" style="display: inline;"> The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.01572v2-abstract-full').style.display = 'inline'; document.getElementById('1604.01572v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.01572v2-abstract-full" style="display: none;"> The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the test were the characterization of the target, the hodoscope and the X-ray detectors. The apparatus consisted of a beam hodoscope and X-rays detectors made with high purity Germanium and Lanthanum Bromide crystals. In this paper the experimental setup is described and the results of the detector characterization are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.01572v2-abstract-full').style.display = 'none'; document.getElementById('1604.01572v2-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">22 pages, 14 figures, published and open access on JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Instrumentation 11/05, P05007, 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.03032">arXiv:1509.03032</a> <span> [<a href="https://arxiv.org/pdf/1509.03032">pdf</a>, <a href="https://arxiv.org/format/1509.03032">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</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.115.114801">10.1103/PhysRevLett.115.114801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Spectro-temporal shaping of seeded free-electron laser pulses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gauthier%2C+D">David Gauthier</a>, <a href="/search/physics?searchtype=author&query=Ribi%C4%8D%2C+P+R">Primo啪 Rebernik Ribi膷</a>, <a href="/search/physics?searchtype=author&query=De+Ninno%2C+G">Giovanni De Ninno</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">Enrico Allaria</a>, <a href="/search/physics?searchtype=author&query=Cinquegrana%2C+P">Paolo Cinquegrana</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">Miltcho Boyanov Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">Alexander Demidovich</a>, <a href="/search/physics?searchtype=author&query=Ferrari%2C+E">Eugenio Ferrari</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">Luca Giannessi</a>, <a href="/search/physics?searchtype=author&query=Mahieu%2C+B">Beno卯t Mahieu</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">Giuseppe Penco</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="1509.03032v1-abstract-short" style="display: inline;"> We demonstrate the ability to control and shape the spectro-temporal content of extreme-ultraviolet (XUV) pulses produced by a seeded free-electron laser (FEL). The control over the spectro-temporal properties of XUV light was achieved by precisely manipulating the linear frequency chirp of the seed laser. Our results agree with existing theory, which allows retrieving the temporal properties (amp… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.03032v1-abstract-full').style.display = 'inline'; document.getElementById('1509.03032v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.03032v1-abstract-full" style="display: none;"> We demonstrate the ability to control and shape the spectro-temporal content of extreme-ultraviolet (XUV) pulses produced by a seeded free-electron laser (FEL). The control over the spectro-temporal properties of XUV light was achieved by precisely manipulating the linear frequency chirp of the seed laser. Our results agree with existing theory, which allows retrieving the temporal properties (amplitude and phase) of the FEL pulse from measurements of the spectra as a function of the FEL operating parameters. Furthermore, we show the first direct evidence of the full temporal coherence of FEL light and generate Fourier limited pulses by fine-tuning the FEL temporal phase. The possibility to tailor the spectro-temporal content of intense short-wavelength pulses represents the first step towards efficient nonlinear optics in the XUV to X-ray spectral region and will enable precise manipulation of core-electron excitations using the methods of coherent quantum control. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.03032v1-abstract-full').style.display = 'none'; document.getElementById('1509.03032v1-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 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">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> Phys. Rev. Lett. 115, 114801 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1507.04131">arXiv:1507.04131</a> <span> [<a href="https://arxiv.org/pdf/1507.04131">pdf</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="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/10.1364/OE.23.024888">10.1364/OE.23.024888 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Single-shot fluctuations in waveguided high-harmonic generation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Goh%2C+S+J">S. J. Goh</a>, <a href="/search/physics?searchtype=author&query=Tao%2C+Y">Y. Tao</a>, <a href="/search/physics?searchtype=author&query=van+der+Slot%2C+P+J+M">P. J. M. van der Slot</a>, <a href="/search/physics?searchtype=author&query=Bastiaens%2C+H+J+M">H. J. M. Bastiaens</a>, <a href="/search/physics?searchtype=author&query=Herek%2C+J">J. Herek</a>, <a href="/search/physics?searchtype=author&query=Biedron%2C+S+G">S. G. Biedron</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">M. B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Milton%2C+S+V">S. V. Milton</a>, <a href="/search/physics?searchtype=author&query=Boller%2C+K+-">K. -J. Boller</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="1507.04131v1-abstract-short" style="display: inline;"> For exploring the application potential of coherent soft x-ray (SXR) and extreme ultraviolet radiation (XUV) provided by high-harmonic generation, it is important to characterize the central output parameters. Of specific importance are pulse-to-pulse (shot-to-shot) fluctuations of the high-harmonic output energy, fluctuations of the direction of the emission (pointing instabilities), and fluctuat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.04131v1-abstract-full').style.display = 'inline'; document.getElementById('1507.04131v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1507.04131v1-abstract-full" style="display: none;"> For exploring the application potential of coherent soft x-ray (SXR) and extreme ultraviolet radiation (XUV) provided by high-harmonic generation, it is important to characterize the central output parameters. Of specific importance are pulse-to-pulse (shot-to-shot) fluctuations of the high-harmonic output energy, fluctuations of the direction of the emission (pointing instabilities), and fluctuations of the beam divergence and shape that reduce the spatial coherence. We present the first single-shot measurements of waveguided high-harmonic generation in a waveguided (capillary-based) geometry. Using a capillary waveguide filled with Argon gas as the nonlinear medium, we provide the first characterization of shot-to-shot fluctuations of the pulse energy, of the divergence and of the beam pointing. We record the strength of these fluctuations vs. two basic input parameters, which are the drive laser pulse energy and the gas pressure in the capillary waveguide. In correlation measurements between single-shot drive laser beam profiles and single-shot high-harmonic beam profiles we prove the absence of drive laser beam-pointing-induced fluctuations in the high-harmonic output. We attribute the main source of high-harmonic fluctuations to ionization-induced nonlinear mode mixing during propagation of the drive laser pulse inside the capillary waveguide. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1507.04131v1-abstract-full').style.display = 'none'; document.getElementById('1507.04131v1-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> 15 July, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1306.1470">arXiv:1306.1470</a> <span> [<a href="https://arxiv.org/pdf/1306.1470">pdf</a>, <a href="https://arxiv.org/ps/1306.1470">ps</a>, <a href="https://arxiv.org/format/1306.1470">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> <span class="tag is-small is-grey 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/10.1364/OE.21.022728">10.1364/OE.21.022728 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Two-colour generation in a chirped seeded Free-Electron Laser </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mahieu%2C+B">B. Mahieu</a>, <a href="/search/physics?searchtype=author&query=Allaria%2C+E">E. Allaria</a>, <a href="/search/physics?searchtype=author&query=Castronovo%2C+D">D. Castronovo</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">M. B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Demidovich%2C+A">A. Demidovich</a>, <a href="/search/physics?searchtype=author&query=De+Ninno%2C+G">G. De Ninno</a>, <a href="/search/physics?searchtype=author&query=Di+Mitri%2C+S">S. Di Mitri</a>, <a href="/search/physics?searchtype=author&query=Fawley%2C+W+M">W. M. Fawley</a>, <a href="/search/physics?searchtype=author&query=Ferrari%2C+E">E. Ferrari</a>, <a href="/search/physics?searchtype=author&query=Fr%C3%B6hlich%2C+L">L. Fr枚hlich</a>, <a href="/search/physics?searchtype=author&query=Gauthier%2C+D">D. Gauthier</a>, <a href="/search/physics?searchtype=author&query=Giannessi%2C+L">L. Giannessi</a>, <a href="/search/physics?searchtype=author&query=Mahne%2C+N">N. Mahne</a>, <a href="/search/physics?searchtype=author&query=Penco%2C+G">G. Penco</a>, <a href="/search/physics?searchtype=author&query=Raimondi%2C+L">L. Raimondi</a>, <a href="/search/physics?searchtype=author&query=Spampinati%2C+S">S. Spampinati</a>, <a href="/search/physics?searchtype=author&query=Spezzani%2C+C">C. Spezzani</a>, <a href="/search/physics?searchtype=author&query=Svetina%2C+C">C. Svetina</a>, <a href="/search/physics?searchtype=author&query=Trov%C3%B2%2C+M+.">M . Trov貌</a>, <a href="/search/physics?searchtype=author&query=Zangrando%2C+M+.">M . Zangrando</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="1306.1470v1-abstract-short" style="display: inline;"> We present the experimental demonstration of a method for generating two spectrally and temporally separated pulses by an externally seeded, single-pass free-electron laser operating in the extreme-ultraviolet spectral range. Our results, collected on the FERMI@Elettra facility and confirmed by numerical simulations, demonstrate the possibility of controlling both the spectral and temporal feature… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.1470v1-abstract-full').style.display = 'inline'; document.getElementById('1306.1470v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1306.1470v1-abstract-full" style="display: none;"> We present the experimental demonstration of a method for generating two spectrally and temporally separated pulses by an externally seeded, single-pass free-electron laser operating in the extreme-ultraviolet spectral range. Our results, collected on the FERMI@Elettra facility and confirmed by numerical simulations, demonstrate the possibility of controlling both the spectral and temporal features of the generated pulses. A free-electron laser operated in this mode becomes a suitable light source for jitter-free, two-colour pump-probe experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1306.1470v1-abstract-full').style.display = 'none'; document.getElementById('1306.1470v1-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> 6 June, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0008147">arXiv:physics/0008147</a> <span> [<a href="https://arxiv.org/pdf/physics/0008147">pdf</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> <p class="title is-5 mathjax"> The FaBrE Project at Trieste </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=D%27Auria%2C+G">G. D'Auria</a>, <a href="/search/physics?searchtype=author&query=Rossi%2C+C">C. Rossi</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Ferrario%2C+M">M. Ferrario</a>, <a href="/search/physics?searchtype=author&query=Piovella%2C+N">N. Piovella</a>, <a href="/search/physics?searchtype=author&query=Serafini%2C+L">L. Serafini</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="physics/0008147v2-abstract-short" style="display: inline;"> A program to design a high brilliance electron source suitable for a short wavelength Linac-based FEL is presented. The goal of the project is to develop a multi-cell integrated photoinjector capable of delivering 1 nC bunches with emittance below 1 mm mrad. This will be the first step toward a possible development of a IV generation light source test facility based on the existing Trieste Linac… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0008147v2-abstract-full').style.display = 'inline'; document.getElementById('physics/0008147v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0008147v2-abstract-full" style="display: none;"> A program to design a high brilliance electron source suitable for a short wavelength Linac-based FEL is presented. The goal of the project is to develop a multi-cell integrated photoinjector capable of delivering 1 nC bunches with emittance below 1 mm mrad. This will be the first step toward a possible development of a IV generation light source test facility based on the existing Trieste Linac. For this purpose a common program between Sincrotrone Trieste and INFN-Milano has been undertaken. Here a brief description of the program and the first results of the RF Gun electromagnetic structure with the beam dynamics on the ELETTRA Linac are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0008147v2-abstract-full').style.display = 'none'; document.getElementById('physics/0008147v2-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 August, 2000; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 August, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2000. </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">LINAC2000 poster MOB07, 3 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> eConf C000821 (2000) MOB07 </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 47.8 92.2 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