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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/2203.10431">arXiv:2203.10431</a> <span> [<a href="https://arxiv.org/pdf/2203.10431">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"> Critical problems of energy frontier Muon Colliders: optics, magnets and radiation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Yu. I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Barzi%2C+E">E. Barzi</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Kapin%2C+V">V. Kapin</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</a>, <a href="/search/physics?searchtype=author&query=Novitski%2C+I">I. Novitski</a>, <a href="/search/physics?searchtype=author&query=Shiltsev%2C+V">V. Shiltsev</a>, <a href="/search/physics?searchtype=author&query=Striganov%2C+S">S. Striganov</a>, <a href="/search/physics?searchtype=author&query=Tropin%2C+I">I. Tropin</a>, <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</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="2203.10431v1-abstract-short" style="display: inline;"> This White Paper brings together our previous studies on a Muon Collider (MC) and presents a design concept of the 6 TeV MC optics, the superconducting (SC) magnets, and a preliminary analysis of the protection system to reduce magnet radiation loads as well as particle backgrounds in the detector. The SC magnets and detector protection considerations impose strict limitations on the lattice choic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.10431v1-abstract-full').style.display = 'inline'; document.getElementById('2203.10431v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.10431v1-abstract-full" style="display: none;"> This White Paper brings together our previous studies on a Muon Collider (MC) and presents a design concept of the 6 TeV MC optics, the superconducting (SC) magnets, and a preliminary analysis of the protection system to reduce magnet radiation loads as well as particle backgrounds in the detector. The SC magnets and detector protection considerations impose strict limitations on the lattice choice, hence the design of the collider optics, magnets and Machine Detector Interface (MDI) are closely intertwined. As a first approximation we use the Interaction Region (IR) design with beta-star=3 mm, whereas for the arcs we re-scale the arc cell design of the 3 TeV MC. Traditional cos-theta coil geometry and Nb3Sn superconductor were used to provide field maps for the analysis and optimization of the arc lattice and IR design, as well as for studies of beam dynamics and magnet protection against radiation. The stress management in the coil will be needed to avoid large degradation or even damage of the brittle SC coils. In the assumed IR designs, the dipoles close to the Interaction Point (IP) and tungsten masks in each IR (to protect magnets) help reducing background particle fluxes in the detector by a substantial factor. The tungsten nozzles in the 6 to 600 cm region from the IP, assisted by the detector solenoid field, trap most of the decay electrons created close to the IP as well as most of the incoherent electron-positron pairs generated in the IP. With sophisticated tungsten, iron, concrete and borated polyethylene shielding in the MDI region, the total reduction of background loads by more than three orders of magnitude can be achieved. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.10431v1-abstract-full').style.display = 'none'; document.getElementById('2203.10431v1-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> 19 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">contribution to Snowmass 2021. arXiv admin note: text overlap with arXiv:1204.6721</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.09010">arXiv:2203.09010</a> <span> [<a href="https://arxiv.org/pdf/2203.09010">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"> Solving Critical Problems of the Muon Collider Higgs Factory: Optics, Magnets and their Protection, Detector Backgrounds </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yu. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Kapin%2C+V">V. Kapin</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</a>, <a href="/search/physics?searchtype=author&query=Striganov%2C+S+I">S. I. Striganov</a>, <a href="/search/physics?searchtype=author&query=Tropin%2C+I+S">I. S. Tropin</a>, <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</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="2203.09010v1-abstract-short" style="display: inline;"> A low-energy medium-luminosity Muon Collider (MC) is being studied as a possible Higgs Factory (HF). Electrons from muon decays will deposit more than 300 kW in superconducting magnets of the HF collider ring. This imposes significant challenges to superconducting (SC) magnets used in the MC storage ring (SR) and interaction regions (IR). Magnet designs are proposed which provide high operating gr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.09010v1-abstract-full').style.display = 'inline'; document.getElementById('2203.09010v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.09010v1-abstract-full" style="display: none;"> A low-energy medium-luminosity Muon Collider (MC) is being studied as a possible Higgs Factory (HF). Electrons from muon decays will deposit more than 300 kW in superconducting magnets of the HF collider ring. This imposes significant challenges to superconducting (SC) magnets used in the MC storage ring (SR) and interaction regions (IR). Magnet designs are proposed which provide high operating gradient and magnetic field in a large aperture to accommodate the large size of muon beams (due to low beta*), as well as a cooling system to intercept the large heat deposition from the showers induced by decay electrons. The distribution of heat deposition in the MC SR lattice elements requires large-aperture magnets in order to accommodate thick high-Z absorbers to protect the SC coils. Based on the developed MARS15 model and intensive simulations, a sophisticated radiation protection system was designed for the collider SR and IR to bring the peak power density in the superconducting coils below the quench limit and reduce the dynamic heat deposition in the cold mass by a factor of 100. The system consists of tight tungsten masks in the magnet interconnect regions and elliptical tungsten liners in the magnet aperture optimized individually for each magnet. These also reduce the background particle fluxes in the collider detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.09010v1-abstract-full').style.display = 'none'; document.getElementById('2203.09010v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">contribution to Snowmass 2021. arXiv admin note: substantial text overlap with arXiv:1806.08883, arXiv:1501.07624</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.08707">arXiv:2203.08707</a> <span> [<a href="https://arxiv.org/pdf/2203.08707">pdf</a>, <a href="https://arxiv.org/format/2203.08707">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"> Versatile Multi-MW Proton Facility with Synchrotron Upgrade of Fermilab Proton Complex </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Eldred%2C+J">J. Eldred</a>, <a href="/search/physics?searchtype=author&query=Ainsworth%2C+R">R. Ainsworth</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Bhat%2C+C">C. Bhat</a>, <a href="/search/physics?searchtype=author&query=Chattopadhyay%2C+S">S. Chattopadhyay</a>, <a href="/search/physics?searchtype=author&query=Derwent%2C+P">P. Derwent</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+D">D. Johnson</a>, <a href="/search/physics?searchtype=author&query=Johnstone%2C+C">C. Johnstone</a>, <a href="/search/physics?searchtype=author&query=Johnstone%2C+J">J. Johnstone</a>, <a href="/search/physics?searchtype=author&query=Kourbanis%2C+I">I. Kourbanis</a>, <a href="/search/physics?searchtype=author&query=Lebedev%2C+V">V. Lebedev</a>, <a href="/search/physics?searchtype=author&query=Nagaitsev%2C+S">S. Nagaitsev</a>, <a href="/search/physics?searchtype=author&query=Pellico%2C+W">W. Pellico</a>, <a href="/search/physics?searchtype=author&query=Pozdeyev%2C+E">E. Pozdeyev</a>, <a href="/search/physics?searchtype=author&query=Shiltsev%2C+V">V. Shiltsev</a>, <a href="/search/physics?searchtype=author&query=Syphers%2C+M">M. Syphers</a>, <a href="/search/physics?searchtype=author&query=Tan%2C+C+Y">C. Y. Tan</a>, <a href="/search/physics?searchtype=author&query=Valishev%2C+A">A. Valishev</a>, <a href="/search/physics?searchtype=author&query=Zwaska%2C+R">R. Zwaska</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="2203.08707v1-abstract-short" style="display: inline;"> DUNE/LBNF constitutes an international multi-decadal physics program for leading-edge neutrino science and proton decay studies [1] and is expected to serve as the flagship particle experiment based at Fermilab. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.08707v1-abstract-full" style="display: none;"> DUNE/LBNF constitutes an international multi-decadal physics program for leading-edge neutrino science and proton decay studies [1] and is expected to serve as the flagship particle experiment based at Fermilab. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.08707v1-abstract-full').style.display = 'none'; document.getElementById('2203.08707v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-20-789-AD </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.08717">arXiv:1806.08717</a> <span> [<a href="https://arxiv.org/pdf/1806.08717">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 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/10.1088/1748-0221/13/11/P11002">10.1088/1748-0221/13/11/P11002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon Collider Lattice Concepts </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Kapin%2C+V">V. Kapin</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="1806.08717v1-abstract-short" style="display: inline;"> A Muon Collider poses a number of challenging problems in the lattice design - low beta-star, small circumference, large physical and dynamic aperture - which must be solved in order to realize the unique opportunities it offers for the high-energy physics. This contribution presents basic solutions which make it possible to achieve the goals for both the energy frontier collider and the Higgs fac… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08717v1-abstract-full').style.display = 'inline'; document.getElementById('1806.08717v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.08717v1-abstract-full" style="display: none;"> A Muon Collider poses a number of challenging problems in the lattice design - low beta-star, small circumference, large physical and dynamic aperture - which must be solved in order to realize the unique opportunities it offers for the high-energy physics. This contribution presents basic solutions which make it possible to achieve the goals for both the energy frontier collider and the Higgs factory with Nb3Sn magnet parameters. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08717v1-abstract-full').style.display = 'none'; document.getElementById('1806.08717v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">17 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/1806.07517">arXiv:1806.07517</a> <span> [<a href="https://arxiv.org/pdf/1806.07517">pdf</a>, <a href="https://arxiv.org/format/1806.07517">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/10.1088/1748-0221/13/08/P08013">10.1088/1748-0221/13/08/P08013 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Helical FOFO Snake for Initial Six-Dimensional Cooling of Muons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</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="1806.07517v1-abstract-short" style="display: inline;"> The helical FOFO snake six-dimensional muon ionization cooling channel design is presented which incorporates wedge absorbers in such a way that simultaneous cooling of both signs of muons is possible. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.07517v1-abstract-full" style="display: none;"> The helical FOFO snake six-dimensional muon ionization cooling channel design is presented which incorporates wedge absorbers in such a way that simultaneous cooling of both signs of muons is possible. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.07517v1-abstract-full').style.display = 'none'; document.getElementById('1806.07517v1-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> 19 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.11120">arXiv:1711.11120</a> <span> [<a href="https://arxiv.org/pdf/1711.11120">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 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/10.1088/1748-0221/12/11/T11007">10.1088/1748-0221/12/11/T11007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Front End for a Neutrino Factory or Muon Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">David Neuffer</a>, <a href="/search/physics?searchtype=author&query=Snopok%2C+P">Pavel Snopok</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</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="1711.11120v1-abstract-short" style="display: inline;"> A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of 渭's produced from a proton source target have been developed, initially for neutrino factory scenarios. They require a drift section from the target, a bunching section and a 蠁-未E rotation section leading into the cooling cha… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.11120v1-abstract-full').style.display = 'inline'; document.getElementById('1711.11120v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.11120v1-abstract-full" style="display: none;"> A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of 渭's produced from a proton source target have been developed, initially for neutrino factory scenarios. They require a drift section from the target, a bunching section and a 蠁-未E rotation section leading into the cooling channel. Important concerns are rf limitations within the focusing magnetic fields and large losses in the transport. The currently preferred cooling channel design is an "HFOFO Snake" configuration that cools both 渭+ and 渭- transversely and longitudinally. The status of the design is presented and variations are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.11120v1-abstract-full').style.display = 'none'; document.getElementById('1711.11120v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 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">14 pp. arXiv admin note: substantial text overlap with arXiv:1612.08977</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> Fermilab-Pub-16-188-AD-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1709.10020">arXiv:1709.10020</a> <span> [<a href="https://arxiv.org/pdf/1709.10020">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"> Landau Damping with Electron Lenses in Space-Charge Dominated Beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Burov%2C+A">Alexey Burov</a>, <a href="/search/physics?searchtype=author&query=Shiltsev%2C+V">Vladimir Shiltsev</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="1709.10020v1-abstract-short" style="display: inline;"> Progress on the Intensity Frontier of high energy physics critically depends on record high intensity charged particles accelerators. Beams in such machines become operationally limited by coherent beam instabilities, particularly enhanced in the regime of strong space charge (SC). Usual methods to control the instabilities, such as octupole magnets, beam feedback dampers and employment of chromat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.10020v1-abstract-full').style.display = 'inline'; document.getElementById('1709.10020v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1709.10020v1-abstract-full" style="display: none;"> Progress on the Intensity Frontier of high energy physics critically depends on record high intensity charged particles accelerators. Beams in such machines become operationally limited by coherent beam instabilities, particularly enhanced in the regime of strong space charge (SC). Usual methods to control the instabilities, such as octupole magnets, beam feedback dampers and employment of chromatic effects, become less effective and insufficient. In [1] it was proposed to employ electron lenses for introduction of sufficient spread in particle oscillation frequencies needed for beam stabilization and in [2] it was shown that electron lenses are uniquely effective for Landau damping of transverse beam instabilities in high energy particle accelerators and their employment does not compromise incoherent (single particle) stability, dynamic aperture and the beam lifetime. Here we consider an important issue of effectiveness of the Landau damping with electron lenses in space-charge dominated beams and demonstrate that the desired stability can be assured with proper choice of the electron beam parameters and current distributions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1709.10020v1-abstract-full').style.display = 'none'; document.getElementById('1709.10020v1-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> 28 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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, 5 figures, 24 formulas, 1 table, 18 references</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-TM-2655-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.08477">arXiv:1706.08477</a> <span> [<a href="https://arxiv.org/pdf/1706.08477">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 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.119.134802">10.1103/PhysRevLett.119.134802 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Landau Damping of Beam Instabilities by Electron Lenses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shiltsev%2C+V">Vladimir Shiltsev</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Burov%2C+A">Alexey Burov</a>, <a href="/search/physics?searchtype=author&query=Valishev%2C+A">Alexander Valishev</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="1706.08477v1-abstract-short" style="display: inline;"> Modern and future particle accelerators employ increasingly higher intensity and brighter beams of charged particles and become operationally limited by coherent beam instabilities. Usual methods to control the instabilities, such as octupole magnets, beam feedback dampers and use of chromatic effects, become less effective and insufficient. We show that, in contrast, Lorentz forces of a low-energ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.08477v1-abstract-full').style.display = 'inline'; document.getElementById('1706.08477v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.08477v1-abstract-full" style="display: none;"> Modern and future particle accelerators employ increasingly higher intensity and brighter beams of charged particles and become operationally limited by coherent beam instabilities. Usual methods to control the instabilities, such as octupole magnets, beam feedback dampers and use of chromatic effects, become less effective and insufficient. We show that, in contrast, Lorentz forces of a low-energy, a magnetically stabilized electron beam, or "electron lens", easily introduces transverse nonlinear focusing sufficient for Landau damping of transverse beam instabilities in accelerators. It is also important that, unlike other nonlinear elements, the electron lens provides the frequency spread mainly at the beam core, thus allowing much higher frequency spread without lifetime degradation. For the parameters of the Future Circular Collider, a single conventional electron lens a few meters long would provide stabilization superior to tens of thousands of superconducting octupole magnets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.08477v1-abstract-full').style.display = 'none'; document.getElementById('1706.08477v1-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 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">17 pages, 4 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB PUB-17-206-AD-APC </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 119, 134802 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.08977">arXiv:1612.08977</a> <span> [<a href="https://arxiv.org/pdf/1612.08977">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"> Front End And HFOFO Snake For a Muon Facility </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">D. Neuffer</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</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="1612.08977v1-abstract-short" style="display: inline;"> A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of 渭's produced from a proton source target have been developed, for neutrino factory and muon collider scenarios. They require a drift section from the target, a bunching section and a 蠁-未E rotation section leading into the coo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.08977v1-abstract-full').style.display = 'inline'; document.getElementById('1612.08977v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.08977v1-abstract-full" style="display: none;"> A neutrino factory or muon collider requires the capture and cooling of a large number of muons. Scenarios for capture, bunching, phase-energy rotation and initial cooling of 渭's produced from a proton source target have been developed, for neutrino factory and muon collider scenarios. They require a drift section from the target, a bunching section and a 蠁-未E rotation section leading into the cooling channel. The currently preferred cooling channel design is an "HFOFO Snake" configuration that cools both 渭+ and 渭- transversely and longitudinally. The status of the design is presented and variations are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.08977v1-abstract-full').style.display = 'none'; document.getElementById('1612.08977v1-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> 28 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">5 pp</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> Fermilab-Conf-15-523-AD-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.02042">arXiv:1502.02042</a> <span> [<a href="https://arxiv.org/pdf/1502.02042">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"> A muon collider as a Higgs factory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">D. Neuffer</a>, <a href="/search/physics?searchtype=author&query=Palmer%2C+M">M. Palmer</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Ankenbrandt%2C+C">C. Ankenbrandt</a>, <a href="/search/physics?searchtype=author&query=Delahaye%2C+J+P">J. P. Delahaye</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="1502.02042v1-abstract-short" style="display: inline;"> Because muons connect directly to a standard-model Higgs particle in s-channel production, a muon collider would be an ideal device for precision measurement of the mass and width of a Higgs-like particle, and for further exploration of its production and decay properties. Parameters of a high-precision muon collider are presented and the necessary components and performance are described. An impo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.02042v1-abstract-full').style.display = 'inline'; document.getElementById('1502.02042v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.02042v1-abstract-full" style="display: none;"> Because muons connect directly to a standard-model Higgs particle in s-channel production, a muon collider would be an ideal device for precision measurement of the mass and width of a Higgs-like particle, and for further exploration of its production and decay properties. Parameters of a high-precision muon collider are presented and the necessary components and performance are described. An important advantage of the muon collider approach is that the spin precession of the muons will enable energy measurements at extremely high accuracy (dE/E to 10-6 or better). The collider could be a first step toward a high-luminosity multi-TeV lepton collider, and extensions toward a higher-energy higher-luminosity device are also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.02042v1-abstract-full').style.display = 'none'; document.getElementById('1502.02042v1-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 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 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">3 pp</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-13-140-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.07624">arXiv:1501.07624</a> <span> [<a href="https://arxiv.org/pdf/1501.07624">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"> Mitigating Radiation Impact on Superconducting Magnets of the Higgs Factory Muon Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mokhov%2C+N">Nikolai Mokhov</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Yuri I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">Vadim V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Striganov%2C+S+I">Sergei I. Striganov</a>, <a href="/search/physics?searchtype=author&query=Tropin%2C+I+S">Igor S. Tropin</a>, <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">Alexander V. Zlobin</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="1501.07624v1-abstract-short" style="display: inline;"> Recent discovery of a Higgs boson boosted interest in a low-energy medium-luminosity Muon Collider as a Higgs Factory (HF). A preliminary design of the HF storage ring (SR) is based on cos-theta Nb3Sn superconducting (SC) magnets with the coil inner diameter ranging from 50 cm in the interaction region to 16 cm in the arc. The coil cross-sections were chosen based on the operation margin, field qu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.07624v1-abstract-full').style.display = 'inline'; document.getElementById('1501.07624v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.07624v1-abstract-full" style="display: none;"> Recent discovery of a Higgs boson boosted interest in a low-energy medium-luminosity Muon Collider as a Higgs Factory (HF). A preliminary design of the HF storage ring (SR) is based on cos-theta Nb3Sn superconducting (SC) magnets with the coil inner diameter ranging from 50 cm in the interaction region to 16 cm in the arc. The coil cross-sections were chosen based on the operation margin, field quality and quench protection considerations to provide an adequate space for the beam pipe, helium channel and inner absorber (liner). With the 62.5-GeV muon energy and 2 x 10^12 muons per bunch, the electrons from muon decays deposit about 300 kW in the SC magnets, or unprecedented 1 kW/m dynamic heat load, which corresponds to a multi-MW room temperature equivalent. Based on the detailed MARS15 model built and intense simulations, a sophisticated protection system was designed for the entire SR to bring the peak power density in the SC coils safely below the quench limit and reduce the dynamic heat load to the cold mass by a factor of 100. The system consists of tight tungsten masks in the magnet interconnect regions and elliptical tungsten liners optimized for each magnet. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.07624v1-abstract-full').style.display = 'none'; document.getElementById('1501.07624v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">4 pp. Presented paper at the 5th International Particle Accelerator Conference, June 15-20, 2014, Dresden, Germany</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> Fermilab-Conf-14-175-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.5483">arXiv:1409.5483</a> <span> [<a href="https://arxiv.org/pdf/1409.5483">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"> Computing Eigen-Emittances from Tracking Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</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="1409.5483v1-abstract-short" style="display: inline;"> In a strongly nonlinear system the particle distribution in the phase space may develop long tails which contribution to the covariance (sigma) matrix should be suppressed for a correct estimate of the beam emittance. A method is offered based on Gaussian approximation of the original particle distribution in the phase space (Klimontovich distribution) which leads to an equation for the sigma matr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5483v1-abstract-full').style.display = 'inline'; document.getElementById('1409.5483v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.5483v1-abstract-full" style="display: none;"> In a strongly nonlinear system the particle distribution in the phase space may develop long tails which contribution to the covariance (sigma) matrix should be suppressed for a correct estimate of the beam emittance. A method is offered based on Gaussian approximation of the original particle distribution in the phase space (Klimontovich distribution) which leads to an equation for the sigma matrix which provides efficient suppression of the tails and cannot be obtained by introducing weights. This equation is easily solved by iterations in the multi-dimensional case. It is also shown how the eigen-emittances and coupled optics functions can be retrieved from the sigma matrix in a strongly coupled system. Finally, the developed algorithm is applied to 6D ionization cooling of muons in HFOFO channel. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5483v1-abstract-full').style.display = 'none'; document.getElementById('1409.5483v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> Muon Accelerator Program Document 4358-v1 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.5479">arXiv:1409.5479</a> <span> [<a href="https://arxiv.org/pdf/1409.5479">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"> Ionization Cooling for Muon Experiments </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">D. Neuffer</a>, <a href="/search/physics?searchtype=author&query=Prebys%2C+E">E. Prebys</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="1409.5479v1-abstract-short" style="display: inline;"> Possible application for muon experiments such as mu2e is discussed of the initial part of the ionization cooling channel originally developed for muon collider. It is shown that with the FNAL Booster as the proton driver the mu2e sensitivity can be increased by two orders of magnitude compared to the presently considered experiment. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.5479v1-abstract-full" style="display: none;"> Possible application for muon experiments such as mu2e is discussed of the initial part of the ionization cooling channel originally developed for muon collider. It is shown that with the FNAL Booster as the proton driver the mu2e sensitivity can be increased by two orders of magnitude compared to the presently considered experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5479v1-abstract-full').style.display = 'none'; document.getElementById('1409.5479v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FNAL Beams-doc-4668-v1 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.5461">arXiv:1409.5461</a> <span> [<a href="https://arxiv.org/pdf/1409.5461">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"> Storage Ring And Interaction Region Magnets For A 渭+渭- Higgs Factory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Y. I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Kappin%2C+V+V">V. V. Kappin</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</a>, <a href="/search/physics?searchtype=author&query=Striganov%2C+S+I">S. I. Striganov</a>, <a href="/search/physics?searchtype=author&query=Tropin%2C+I+S">I. S. Tropin</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="1409.5461v1-abstract-short" style="display: inline;"> A low-energy Muon Collider (MC) offers unique opportunities to study the recently found Higgs boson. However, due to a relatively large beam emittance with moderate cooling in this machine, large-aperture high- field superconducting (SC) magnets are required. The magnets need also an adequate margin to operate at a large radiation load from the muon decay showers. General specifications of the SC… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5461v1-abstract-full').style.display = 'inline'; document.getElementById('1409.5461v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.5461v1-abstract-full" style="display: none;"> A low-energy Muon Collider (MC) offers unique opportunities to study the recently found Higgs boson. However, due to a relatively large beam emittance with moderate cooling in this machine, large-aperture high- field superconducting (SC) magnets are required. The magnets need also an adequate margin to operate at a large radiation load from the muon decay showers. General specifications of the SC dipoles and quadrupoles for the 125 GeV c.o.m. Higgs Factory with an average luminosity of ~2x10**31 cm-2s-1 are formulated. Magnet conceptual designs and parameters are reported. The impact of the magnet fringe fields on the beam dynamics as well as the IR and lattice magnet protection from radiation are also reported and discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5461v1-abstract-full').style.display = 'none'; document.getElementById('1409.5461v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </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">3 p. Presented at North American Particle Accelerator Conference (PAC 2013) Conference</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-13-411-APC-TD </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1308.2143">arXiv:1308.2143</a> <span> [<a href="https://arxiv.org/pdf/1308.2143">pdf</a>, <a href="https://arxiv.org/format/1308.2143">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Muon Collider Higgs Factory for Snowmass 2013 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Ankenbrandt%2C+C+M">Charles M. Ankenbrandt</a>, <a href="/search/physics?searchtype=author&query=Cline%2C+D+B">David B. Cline</a>, <a href="/search/physics?searchtype=author&query=Conway%2C+A">Alexander Conway</a>, <a href="/search/physics?searchtype=author&query=Cummings%2C+M+A">Mary Anne Cummings</a>, <a href="/search/physics?searchtype=author&query=Di+Benedetto%2C+V">Vito Di Benedetto</a>, <a href="/search/physics?searchtype=author&query=Eichten%2C+E">Estia Eichten</a>, <a href="/search/physics?searchtype=author&query=Gatto%2C+C">Corrado Gatto</a>, <a href="/search/physics?searchtype=author&query=Grinstein%2C+B">Benjamin Grinstein</a>, <a href="/search/physics?searchtype=author&query=Gunion%2C+J">Jack Gunion</a>, <a href="/search/physics?searchtype=author&query=Han%2C+T">Tao Han</a>, <a href="/search/physics?searchtype=author&query=Hanson%2C+G">Gail Hanson</a>, <a href="/search/physics?searchtype=author&query=Hill%2C+C+T">Christopher T. Hill</a>, <a href="/search/physics?searchtype=author&query=Ignatov%2C+F">Fedor Ignatov</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+R+P">Rolland P. Johnson</a>, <a href="/search/physics?searchtype=author&query=Lebedev%2C+V">Valeri Lebedev</a>, <a href="/search/physics?searchtype=author&query=Lipton%2C+R">Ron Lipton</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Z">Zhen Liu</a>, <a href="/search/physics?searchtype=author&query=Markiewicz%2C+T">Tom Markiewicz</a>, <a href="/search/physics?searchtype=author&query=Mazzacane%2C+A">Anna Mazzacane</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N">Nikolai Mokhov</a>, <a href="/search/physics?searchtype=author&query=Nagaitsev%2C+S">Sergei Nagaitsev</a>, <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">David Neuffer</a>, <a href="/search/physics?searchtype=author&query=Palmer%2C+M">Mark Palmer</a>, <a href="/search/physics?searchtype=author&query=Purohit%2C+M+V">Milind V. Purohit</a> , et al. (5 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="1308.2143v1-abstract-short" style="display: inline;"> We propose the construction of, and describe in detail, a compact Muon Collider s-channel Higgs Factory. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1308.2143v1-abstract-full" style="display: none;"> We propose the construction of, and describe in detail, a compact Muon Collider s-channel Higgs Factory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1308.2143v1-abstract-full').style.display = 'none'; document.getElementById('1308.2143v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 August, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2013. </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">43 pages, 20 figures, 10 tables</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-13-245-T </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1307.6129">arXiv:1307.6129</a> <span> [<a href="https://arxiv.org/pdf/1307.6129">pdf</a>, <a href="https://arxiv.org/format/1307.6129">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> The Case for a Muon Collider Higgs Factory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Ankenbrandt%2C+C+M">Charles M. Ankenbrandt</a>, <a href="/search/physics?searchtype=author&query=Cline%2C+D+B">David B. Cline</a>, <a href="/search/physics?searchtype=author&query=Conway%2C+A">Alexander Conway</a>, <a href="/search/physics?searchtype=author&query=Cummings%2C+M+A">Mary Anne Cummings</a>, <a href="/search/physics?searchtype=author&query=Di+Benedetto%2C+V">Vito Di Benedetto</a>, <a href="/search/physics?searchtype=author&query=Eichten%2C+E">Estia Eichten</a>, <a href="/search/physics?searchtype=author&query=Delahaye%2C+J">Jean-Pierre Delahaye</a>, <a href="/search/physics?searchtype=author&query=Gatto%2C+C">Corrado Gatto</a>, <a href="/search/physics?searchtype=author&query=Grinstein%2C+B">Benjamin Grinstein</a>, <a href="/search/physics?searchtype=author&query=Gunion%2C+J">Jack Gunion</a>, <a href="/search/physics?searchtype=author&query=Han%2C+T">Tao Han</a>, <a href="/search/physics?searchtype=author&query=Hanson%2C+G">Gail Hanson</a>, <a href="/search/physics?searchtype=author&query=Hill%2C+C+T">Christopher T. Hill</a>, <a href="/search/physics?searchtype=author&query=Ignatov%2C+F">Fedor Ignatov</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+R+P">Rolland P. Johnson</a>, <a href="/search/physics?searchtype=author&query=Lebedev%2C+V">Valeri Lebedev</a>, <a href="/search/physics?searchtype=author&query=Lederman%2C+L+M">Leon M. Lederman</a>, <a href="/search/physics?searchtype=author&query=Lipton%2C+R">Ron Lipton</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Z">Zhen Liu</a>, <a href="/search/physics?searchtype=author&query=Markiewicz%2C+T">Tom Markiewicz</a>, <a href="/search/physics?searchtype=author&query=Mazzacane%2C+A">Anna Mazzacane</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N">Nikolai Mokhov</a>, <a href="/search/physics?searchtype=author&query=Nagaitsev%2C+S">Sergei Nagaitsev</a>, <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">David Neuffer</a> , et al. (8 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="1307.6129v1-abstract-short" style="display: inline;"> We propose the construction of a compact Muon Collider Higgs Factory. Such a machine can produce up to \sim 14,000 at 8\times 10^{31} cm^-2 sec^-1 clean Higgs events per year, enabling the most precise possible measurement of the mass, width and Higgs-Yukawa coupling constants. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1307.6129v1-abstract-full" style="display: none;"> We propose the construction of a compact Muon Collider Higgs Factory. Such a machine can produce up to \sim 14,000 at 8\times 10^{31} cm^-2 sec^-1 clean Higgs events per year, enabling the most precise possible measurement of the mass, width and Higgs-Yukawa coupling constants. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.6129v1-abstract-full').style.display = 'none'; document.getElementById('1307.6129v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 July, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2013. </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">Supporting letter for the document: "Muon Collider Higgs Factory for Smowmass 2013", A White Paper submitted to the 2013 U.S. Community Summer Study of the Division of Particles and Fields of the American Physical Society, Y. Alexahin, et. al, FERMILAB-CONF-13-245-T (July, 2013)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.7679">arXiv:1301.7679</a> <span> [<a href="https://arxiv.org/pdf/1301.7679">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"> Observation of Instabilities of Coherent Transverse Ocillations in the Fermilab Booster </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Eddy%2C+N">N. Eddy</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Lebedev%2C+V">V. Lebedev</a>, <a href="/search/physics?searchtype=author&query=Marsh%2C+W">W. Marsh</a>, <a href="/search/physics?searchtype=author&query=Pellico%2C+W">W. Pellico</a>, <a href="/search/physics?searchtype=author&query=Triplett%2C+K">K. Triplett</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="1301.7679v1-abstract-short" style="display: inline;"> The Fermilab Booster - built more than 40 years ago - operates well above the design proton beam intensity of 4x10**12 ppp. Still, the Fermilab neutrino experiments call for even higher intensity of 5.5x10**12 ppp. A multitude of intensity related effects must be overcome in order to meet this goal including suppression of coherent dipole instabilities of transverse oscillations which manifest the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7679v1-abstract-full').style.display = 'inline'; document.getElementById('1301.7679v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.7679v1-abstract-full" style="display: none;"> The Fermilab Booster - built more than 40 years ago - operates well above the design proton beam intensity of 4x10**12 ppp. Still, the Fermilab neutrino experiments call for even higher intensity of 5.5x10**12 ppp. A multitude of intensity related effects must be overcome in order to meet this goal including suppression of coherent dipole instabilities of transverse oscillations which manifest themselves as a sudden drop in the beam current. In this report we present the results of observation of these instabilities at different tune, coupling and chromaticity settings and discuss possible cures. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7679v1-abstract-full').style.display = 'none'; document.getElementById('1301.7679v1-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> 31 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </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">3 pp. 3rd International Particle Accelerator Conference (IPAC 2012) 20-25 May 2012, New Orleans, Louisiana</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-12-219-AD-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.7446">arXiv:1301.7446</a> <span> [<a href="https://arxiv.org/pdf/1301.7446">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"> Tune Determination of Strongly Coupled Betatron Oscillations in a Fast-Ramping Synchrotron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Marsh%2C+W">W Marsh</a>, <a href="/search/physics?searchtype=author&query=Triplett%2C+K">K. Triplett</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="1301.7446v1-abstract-short" style="display: inline;"> Tune identification - i.e. attribution of the spectral peak to a particular normal mode of oscillations - can present a significant difficulty in the presence of strong transverse coupling when the normal mode with a lower damping rate dominates spectra of Turn-by-Turn oscillations in both planes. The introduced earlier phased sum algorithm helped to recover the weaker normal mode signal from the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7446v1-abstract-full').style.display = 'inline'; document.getElementById('1301.7446v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.7446v1-abstract-full" style="display: none;"> Tune identification - i.e. attribution of the spectral peak to a particular normal mode of oscillations - can present a significant difficulty in the presence of strong transverse coupling when the normal mode with a lower damping rate dominates spectra of Turn-by-Turn oscillations in both planes. The introduced earlier phased sum algorithm helped to recover the weaker normal mode signal from the noise, but by itself proved to be insufficient for automatic peak identification in the case of close phase advance distribution in both planes. To resolve this difficulty we modified the algorithm by taking and analyzing Turn-by-Turn data for two different ramps with the beam oscillation excited in each plane in turn. Comparison of the relative amplitudes of Fourier components allows for automatic correct tune identification. The proposed algorithm was implemented in the Fermilab Booster B38 console application and successfully used in tune, coupling and chromaticity measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7446v1-abstract-full').style.display = 'none'; document.getElementById('1301.7446v1-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> 30 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2013. </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">3 pp. 3rd International Particle Accelerator Conference (IPAC 2012) 20-25 May 2012, New Orleans, Louisiana</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-12-150-APC-AD </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1204.5739">arXiv:1204.5739</a> <span> [<a href="https://arxiv.org/pdf/1204.5739">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 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/PhysRevSTAB.14.061001">10.1103/PhysRevSTAB.14.061001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon collider interaction region design </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Y. I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</a>, <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</a>, <a href="/search/physics?searchtype=author&query=Alexakhin%2C+V+Y">V. Y. Alexakhin</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="1204.5739v1-abstract-short" style="display: inline;"> Design of a muon collider interaction region (IR) presents a number of challenges arising from low 尾* < 1 cm, correspondingly large beta-function values and beam sizes at IR magnets, as well as the necessity to protect superconducting magnets and collider detectors from muon decay products. As a consequence, the designs of the IR optics, magnets and machine-detector interface are strongly interlac… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.5739v1-abstract-full').style.display = 'inline'; document.getElementById('1204.5739v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1204.5739v1-abstract-full" style="display: none;"> Design of a muon collider interaction region (IR) presents a number of challenges arising from low 尾* < 1 cm, correspondingly large beta-function values and beam sizes at IR magnets, as well as the necessity to protect superconducting magnets and collider detectors from muon decay products. As a consequence, the designs of the IR optics, magnets and machine-detector interface are strongly interlaced and iterative. A consistent solution for the 1.5 TeV c.o.m. muon collider IR is presented. It can provide an average luminosity of 1034 cm-2s-1 with an adequate protection of magnet and detector components. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.5739v1-abstract-full').style.display = 'none'; document.getElementById('1204.5739v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 April, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pp</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-PUB-11-370-APC </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.ST Accel.Beams 14 (2011) 061001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.3979">arXiv:1202.3979</a> <span> [<a href="https://arxiv.org/pdf/1202.3979">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"> Muon Collider interaction region and machine-detector interface design </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Y. I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Striganov%2C+S+I">S. I. Striganov</a>, <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</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="1202.3979v1-abstract-short" style="display: inline;"> One of the key systems of a Muon Collider (MC) - seen as the most exciting option for the energy frontier machine in the post-LHC era - is its interaction region (IR). Designs of its optics, magnets and machine-detector interface are strongly interlaced and iterative. As a result of recent comprehensive studies, consistent solutions for the 1.5-TeV c.o.m. MC IR have been found and are described he… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.3979v1-abstract-full').style.display = 'inline'; document.getElementById('1202.3979v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.3979v1-abstract-full" style="display: none;"> One of the key systems of a Muon Collider (MC) - seen as the most exciting option for the energy frontier machine in the post-LHC era - is its interaction region (IR). Designs of its optics, magnets and machine-detector interface are strongly interlaced and iterative. As a result of recent comprehensive studies, consistent solutions for the 1.5-TeV c.o.m. MC IR have been found and are described here. To provide the required momentum acceptance, dynamic aperture and chromaticity, an innovative approach was used for the IR optics. Conceptual designs of large-aperture high-field dipole and high-gradient quadrupole magnets based on Nb3Sn superconductor were developed and analyzed in terms of the operating margin, field quality, mechanics, coil cooling and quench protection. Shadow masks in the interconnect regions and liners inside the magnets are used to mitigate the unprecedented dynamic heat deposition due to muon decays (~0.5 kW/m). It is shown that an appropriately designed machine-detector interface (MDI) with sophisticated shielding in the detector has a potential to substantially suppress the background rates in the MC detector. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.3979v1-abstract-full').style.display = 'none'; document.getElementById('1202.3979v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pp. Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr 2011: New York, USA</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-11-094-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.2155">arXiv:1202.2155</a> <span> [<a href="https://arxiv.org/pdf/1202.2155">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"> Muon Collider design status </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</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="1202.2155v1-abstract-short" style="display: inline;"> Muon Collider (MC) - proposed by G. I. Budker and A. N. Skrinsky a few decades ago - is now considered as the most exciting option for the energy frontier machine in the post-LHC era. A national Muon Accelerator Program (MAP) is being formed in the USA with the ultimate goal of building a MC at the Fermilab site with c.o.m. energy in the range 1.5-3 TeV and luminosity of ~1-5 \times 10^{34} cm^{-2… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.2155v1-abstract-full').style.display = 'inline'; document.getElementById('1202.2155v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.2155v1-abstract-full" style="display: none;"> Muon Collider (MC) - proposed by G. I. Budker and A. N. Skrinsky a few decades ago - is now considered as the most exciting option for the energy frontier machine in the post-LHC era. A national Muon Accelerator Program (MAP) is being formed in the USA with the ultimate goal of building a MC at the Fermilab site with c.o.m. energy in the range 1.5-3 TeV and luminosity of ~1-5 \times 10^{34} cm^{-2}s^{-1}1. As the first step on the way to MC it envisages construction of a Neutrino Factory (NF) for high-precision neutrino experiments. The baseline scheme of the NF-MC complex is presented and possible options for its main components are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.2155v1-abstract-full').style.display = 'none'; document.getElementById('1202.2155v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pp. 22nd Russian Particle Accelerator Conference (RUPAC 2010), 27 Sep - 1 Oct 2010: Protvino, Moscow Region, Russia</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-10-380-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.1507">arXiv:1202.1507</a> <span> [<a href="https://arxiv.org/pdf/1202.1507">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"> Tune Evaluation From Phased BPM Turn-By-Turn Data </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Marsh%2C+W">W. Marsh</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="1202.1507v1-abstract-short" style="display: inline;"> In fast ramping synchrotrons like the Fermilab Booster the conventional methods of betatron tune evaluation from the turn-by-turn data may not work due to rapid changes of the tunes (sometimes in a course of a few dozens of turns) and a high level of noise. We propose a technique based on phasing of signals from a large number of BPMs which significantly increases the signal to noise ratio. Implem… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.1507v1-abstract-full').style.display = 'inline'; document.getElementById('1202.1507v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.1507v1-abstract-full" style="display: none;"> In fast ramping synchrotrons like the Fermilab Booster the conventional methods of betatron tune evaluation from the turn-by-turn data may not work due to rapid changes of the tunes (sometimes in a course of a few dozens of turns) and a high level of noise. We propose a technique based on phasing of signals from a large number of BPMs which significantly increases the signal to noise ratio. Implementation of the method in the Fermilab Booster control system is described and some measurement results are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.1507v1-abstract-full').style.display = 'none'; document.getElementById('1202.1507v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pp. 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010: Kyoto, Japan</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-10-135-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.0303">arXiv:1202.0303</a> <span> [<a href="https://arxiv.org/pdf/1202.0303">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"> Conceptual design of the muon collider ring lattice </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Netepenko%2C+A">A. Netepenko</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="1202.0303v1-abstract-short" style="display: inline;"> Muon collider is a promising candidate for the next energy frontier machine. However, in order to obtain peak luminosity in the 1035/cm2/s range the collider lattice design must satisfy a number of stringent requirements, such as low beta at IP (尾* < 1 cm), large momentum acceptance and dynamic aperture and small value of the momentum compaction factor. Here we present a particular solution for th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0303v1-abstract-full').style.display = 'inline'; document.getElementById('1202.0303v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.0303v1-abstract-full" style="display: none;"> Muon collider is a promising candidate for the next energy frontier machine. However, in order to obtain peak luminosity in the 1035/cm2/s range the collider lattice design must satisfy a number of stringent requirements, such as low beta at IP (尾* < 1 cm), large momentum acceptance and dynamic aperture and small value of the momentum compaction factor. Here we present a particular solution for the interaction region optics whose distinctive feature is a three-sextupole local chromatic correction scheme. Together with a new flexible momentum compaction arc cell design this scheme allows to satisfy all the above-mentioned requirements and is relatively insensitive to the beam-beam effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0303v1-abstract-full').style.display = 'none'; document.getElementById('1202.0303v1-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 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pp. 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010: Kyoto, Japan</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-10-113-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.0297">arXiv:1202.0297</a> <span> [<a href="https://arxiv.org/pdf/1202.0297">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"> Rapid-cycling synchrotron with variable momentum compaction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Y. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Summers%2C+D+J">D. J. Summers</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="1202.0297v1-abstract-short" style="display: inline;"> There are conflicting requirements on the value of the momentum compaction factor during energy ramping in a synchrotron: at low energies it should be positive and sufficiently large to make the slippage factor small so that it is possible to work closer to the RF voltage crest and ensure sufficient RF bucket area, whereas at higher energies it should be small or negative to avoid transition cross… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0297v1-abstract-full').style.display = 'inline'; document.getElementById('1202.0297v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.0297v1-abstract-full" style="display: none;"> There are conflicting requirements on the value of the momentum compaction factor during energy ramping in a synchrotron: at low energies it should be positive and sufficiently large to make the slippage factor small so that it is possible to work closer to the RF voltage crest and ensure sufficient RF bucket area, whereas at higher energies it should be small or negative to avoid transition crossing. In the present report we propose a lattice with a variable momentum compaction factor and consider the possibility of using it in a high repetition rate proton driver for a muon collider and neutrino factory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0297v1-abstract-full').style.display = 'none'; document.getElementById('1202.0297v1-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 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pp. 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010: Kyoto, Japan</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-10-121-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.0270">arXiv:1202.0270</a> <span> [<a href="https://arxiv.org/pdf/1202.0270">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"> Magnet designs for muon collider ring and interactions regions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Y. I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</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="1202.0270v1-abstract-short" style="display: inline;"> Conceptual designs of superconducting magnets for the storage ring of a Muon Collider with a 1.5 TeV c.o.m. energy and an average luminosity of 10 34 cm-2s-1 are presented. All magnets are based on Nb3Sn superconductor and designed to provide an adequate operating field/field gradient in the aperture with the critical current margin required for reliable magnet operation in the machine. Magnet cro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0270v1-abstract-full').style.display = 'inline'; document.getElementById('1202.0270v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.0270v1-abstract-full" style="display: none;"> Conceptual designs of superconducting magnets for the storage ring of a Muon Collider with a 1.5 TeV c.o.m. energy and an average luminosity of 10 34 cm-2s-1 are presented. All magnets are based on Nb3Sn superconductor and designed to provide an adequate operating field/field gradient in the aperture with the critical current margin required for reliable magnet operation in the machine. Magnet cross-sections were optimized to achieve the accelerator field quality in the magnet aperture occupied with beams. The magnets and corresponding protective measures are designed to handle about 0.5 kW/m of dynamic heat load from the muon beam decays. Magnet parameters are reported and compared with the requirements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0270v1-abstract-full').style.display = 'none'; document.getElementById('1202.0270v1-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 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pp. 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010: Kyoto, Japan</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-10-132-APC-TD </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1202.0198">arXiv:1202.0198</a> <span> [<a href="https://arxiv.org/pdf/1202.0198">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"> Muon collider interaction region design </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y+I">Y. I. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Gianfelice-Wendt%2C+E">E. Gianfelice-Wendt</a>, <a href="/search/physics?searchtype=author&query=Kashikhin%2C+V+V">V. V. Kashikhin</a>, <a href="/search/physics?searchtype=author&query=Mokhov%2C+N+V">N. V. Mokhov</a>, <a href="/search/physics?searchtype=author&query=Zlobin%2C+A+V">A. V. Zlobin</a>, <a href="/search/physics?searchtype=author&query=Alexakhin%2C+V+Y">V. Y. Alexakhin</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="1202.0198v1-abstract-short" style="display: inline;"> Design of a muon collider interaction region (IR) presents a number of challenges arising from low 尾 * < 1 cm, correspondingly large beta-function values and beam sizes at IR magnets, as well as the necessity to protect superconducting magnets and collider detectors from muon decay products. As a consequence, the designs of the IR optics, magnets and machine-detector interface are strongly interla… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0198v1-abstract-full').style.display = 'inline'; document.getElementById('1202.0198v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1202.0198v1-abstract-full" style="display: none;"> Design of a muon collider interaction region (IR) presents a number of challenges arising from low 尾 * < 1 cm, correspondingly large beta-function values and beam sizes at IR magnets, as well as the necessity to protect superconducting magnets and collider detectors from muon decay products. As a consequence, the designs of the IR optics, magnets and machine-detector interface are strongly interlaced and iterative. A consistent solution for the 1.5 TeV c.o.m. muon collider IR is presented. It can provide an average luminosity of 1034 cm-2s-1 with an adequate protection of magnet and detector components. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1202.0198v1-abstract-full').style.display = 'none'; document.getElementById('1202.0198v1-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 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pp. 1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010: Kyoto, Japan</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-10-106-APC </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0906.0386">arXiv:0906.0386</a> <span> [<a href="https://arxiv.org/pdf/0906.0386">pdf</a>, <a href="https://arxiv.org/ps/0906.0386">ps</a>, <a href="https://arxiv.org/format/0906.0386">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/10.1088/1748-0221/7/12/P12002">10.1088/1748-0221/7/12/P12002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Simulation of Beam-Beam Effects and Tevatron Experience </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Valishev%2C+A">A. Valishev</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yu. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Lebedev%2C+V">V. Lebedev</a>, <a href="/search/physics?searchtype=author&query=Shatilov%2C+D">D. Shatilov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0906.0386v3-abstract-short" style="display: inline;"> Effects of electromagnetic interactions of colliding bunches in the Tevatron had a variety of manifestations in beam dynamics presenting vast opportunities for development of simulation models and tools. In this paper the computer code for simulation of weak-strong beam-beam effects in hadron colliders is described. We report the collider operational experience relevant to beam-beam interactions,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.0386v3-abstract-full').style.display = 'inline'; document.getElementById('0906.0386v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0906.0386v3-abstract-full" style="display: none;"> Effects of electromagnetic interactions of colliding bunches in the Tevatron had a variety of manifestations in beam dynamics presenting vast opportunities for development of simulation models and tools. In this paper the computer code for simulation of weak-strong beam-beam effects in hadron colliders is described. We report the collider operational experience relevant to beam-beam interactions, explain major effects limiting the collider performance and compare results of observations and measurements with simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0906.0386v3-abstract-full').style.display = 'none'; document.getElementById('0906.0386v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 June, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 17 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-CONF-08-366-AD </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0802.0504">arXiv:0802.0504</a> <span> [<a href="https://arxiv.org/pdf/0802.0504">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 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/10.1088/1367-2630/10/4/043042">10.1088/1367-2630/10/4/043042 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental Studies of Compensation of Beam-Beam Effects with Tevatron Electron Lenses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shiltsev%2C+V">V. Shiltsev</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yu. Alexahin</a>, <a href="/search/physics?searchtype=author&query=Bishofberger%2C+K">K. Bishofberger</a>, <a href="/search/physics?searchtype=author&query=Kamerdzhiev%2C+V">V. Kamerdzhiev</a>, <a href="/search/physics?searchtype=author&query=Parkhomchuk%2C+V">V. Parkhomchuk</a>, <a href="/search/physics?searchtype=author&query=Reva%2C+V">V. Reva</a>, <a href="/search/physics?searchtype=author&query=Solyak%2C+N">N. Solyak</a>, <a href="/search/physics?searchtype=author&query=Wildman%2C+D">D. Wildman</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+X+-">X. -L. Zhang</a>, <a href="/search/physics?searchtype=author&query=Zimmermann%2C+F">F. Zimmermann</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="0802.0504v1-abstract-short" style="display: inline;"> Applying the space-charge forces of a low-energy electron beam can lead to a significant improvement of the beam-particle lifetime limit arising from the beam-beam interaction in a high-energy collider [1]. In this article we present the results of various beam experiments with electron lenses, novel instruments developed for the beam-beam compensation at the Tevatron, which collides 980-GeV pro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0802.0504v1-abstract-full').style.display = 'inline'; document.getElementById('0802.0504v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0802.0504v1-abstract-full" style="display: none;"> Applying the space-charge forces of a low-energy electron beam can lead to a significant improvement of the beam-particle lifetime limit arising from the beam-beam interaction in a high-energy collider [1]. In this article we present the results of various beam experiments with electron lenses, novel instruments developed for the beam-beam compensation at the Tevatron, which collides 980-GeV proton and antiproton beams. We study the dependencies of the particle betatron tunes on the electron beam current, energy and position; we explore the effects of electron-beam imperfections and noises; and we quantify the improvements of the high-energy beam intensity and the collider luminosity lifetime obtained by the action of the Tevatron Electron Lenses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0802.0504v1-abstract-full').style.display = 'none'; document.getElementById('0802.0504v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">submitted for publication in New Journal of Physics</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> New J.Phys.10:043042,2008 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0711.4275">arXiv:0711.4275</a> <span> [<a href="https://arxiv.org/pdf/0711.4275">pdf</a>, <a href="https://arxiv.org/ps/0711.4275">ps</a>, <a href="https://arxiv.org/format/0711.4275">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/10.2172/921988">10.2172/921988 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Complete Scheme of Ionization Cooling for a Muon Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Palmer%2C+R+B">Robert B. Palmer</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+J+S">J. Scott Berg</a>, <a href="/search/physics?searchtype=author&query=Fernow%2C+R+C">Richard C. Fernow</a>, <a href="/search/physics?searchtype=author&query=Gallardo%2C+J+C">Juan Carlos Gallardo</a>, <a href="/search/physics?searchtype=author&query=Kirk%2C+H+G">Harold G. Kirk</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">David Neuffer</a>, <a href="/search/physics?searchtype=author&query=Kahn%2C+S+A">Stephen Alan Kahn</a>, <a href="/search/physics?searchtype=author&query=Summers%2C+D">Don Summers</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="0711.4275v1-abstract-short" style="display: inline;"> A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.4275v1-abstract-full').style.display = 'inline'; document.getElementById('0711.4275v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0711.4275v1-abstract-full" style="display: none;"> A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high Tc superconductor at 4 K. Preliminary simulations of each element are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0711.4275v1-abstract-full').style.display = 'none'; document.getElementById('0711.4275v1-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 November, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> BNL-78088-2007-CP </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Conf.Proc.C070625:3193,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0709.2864">arXiv:0709.2864</a> <span> [<a href="https://arxiv.org/pdf/0709.2864">pdf</a>, <a href="https://arxiv.org/ps/0709.2864">ps</a>, <a href="https://arxiv.org/format/0709.2864">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"> A Complete Scheme for a Muon Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Palmer%2C+R+B">Robert B. Palmer</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+J+S">J. Scott Berg</a>, <a href="/search/physics?searchtype=author&query=Fernow%2C+R+C">Richard C. Fernow</a>, <a href="/search/physics?searchtype=author&query=Gallardo%2C+J+C">Juan Carlos Gallardo</a>, <a href="/search/physics?searchtype=author&query=Kirk%2C+H+G">Harold G. Kirk</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+%3B+Y">; Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">David Neuffer</a>, <a href="/search/physics?searchtype=author&query=Kahn%2C+%3B+S+A">; Stephen Alan Kahn</a>, <a href="/search/physics?searchtype=author&query=Summers%2C+%3B+D+J">; Don J. Summers</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="0709.2864v1-abstract-short" style="display: inline;"> A complete scheme for production, cooling, acceleration, and ring for a 1.5 TeV center of mass muon collider is presented, together with parameters for two higher energy machines. The schemes starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Six dimensional cooling in long-period helical lattices reduces the longitudinal emittance until it beco… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0709.2864v1-abstract-full').style.display = 'inline'; document.getElementById('0709.2864v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0709.2864v1-abstract-full" style="display: none;"> A complete scheme for production, cooling, acceleration, and ring for a 1.5 TeV center of mass muon collider is presented, together with parameters for two higher energy machines. The schemes starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Six dimensional cooling in long-period helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0709.2864v1-abstract-full').style.display = 'none'; document.getElementById('0709.2864v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 September, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 9 figures (EPS); submitted to Proceedings of COOL 07 Workshop</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> NFMCC-doc-519 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Conf.Proc.C07091010:tum2i06,2007 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0705.0320">arXiv:0705.0320</a> <span> [<a href="https://arxiv.org/pdf/0705.0320">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 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.99.244801">10.1103/PhysRevLett.99.244801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Experimental Demonstration of Compensation of Beam-Beam Effects by Electron Lenses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Shiltsev%2C+V">Vladimir Shiltsev</a>, <a href="/search/physics?searchtype=author&query=Alexahin%2C+Y">Yuri Alexahin</a>, <a href="/search/physics?searchtype=author&query=Kamerdzhiev%2C+V">Vsevolod Kamerdzhiev</a>, <a href="/search/physics?searchtype=author&query=Kuznetsov%2C+G">Gennady Kuznetsov</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+X">Xiao-Long Zhang</a>, <a href="/search/physics?searchtype=author&query=Bishofberger%2C+K">Kip Bishofberger</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="0705.0320v1-abstract-short" style="display: inline;"> We report the first experimental demonstration of compensation of beam-beam interaction effects in high-energy particle collider by using space-charge forces of a low-energy electron beam. In our experiments, an electron lens, a novel instrument developed for the beam-beam compensation, was set on a 980-GeV proton bunch in the Tevatron proton-antiproton collider. The proton bunch losses due to i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0705.0320v1-abstract-full').style.display = 'inline'; document.getElementById('0705.0320v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0705.0320v1-abstract-full" style="display: none;"> We report the first experimental demonstration of compensation of beam-beam interaction effects in high-energy particle collider by using space-charge forces of a low-energy electron beam. In our experiments, an electron lens, a novel instrument developed for the beam-beam compensation, was set on a 980-GeV proton bunch in the Tevatron proton-antiproton collider. The proton bunch losses due to its interaction with antiproton beam were reduced by a factor of 2 when the electron lens was operating. We describe the principle of electron lens operation and present experimental results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0705.0320v1-abstract-full').style.display = 'none'; document.getElementById('0705.0320v1-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 May, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">submitted to Physical Review Letters, April 2, 2007. submitted to Physical Review Letters, April 2, 2007</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 99, 244801 (2007) </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 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><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 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

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