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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.03137">arXiv:2403.03137</a> <span> [<a href="https://arxiv.org/pdf/2403.03137">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"> Enhanced beam-beam modeling to include longitudinal variation during weak-strong simulation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xu%2C+D">Derong Xu</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">Vasiliy S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Sagan%2C+D">David Sagan</a>, <a href="/search/physics?searchtype=author&query=Hao%2C+Y">Yue Hao</a>, <a href="/search/physics?searchtype=author&query=Luo%2C+Y">Yun Luo</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="2403.03137v2-abstract-short" style="display: inline;"> Beam-beam interactions pose substantial challenges in the design and operation of circular colliders, significantly affecting their performance. In particular, the weak-strong simulation approach is pivotal for investigating single-particle dynamics during the collider design phase. This paper evaluates the limitations of existing models in weak-strong simulations, noting that while they accuratel… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03137v2-abstract-full').style.display = 'inline'; document.getElementById('2403.03137v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.03137v2-abstract-full" style="display: none;"> Beam-beam interactions pose substantial challenges in the design and operation of circular colliders, significantly affecting their performance. In particular, the weak-strong simulation approach is pivotal for investigating single-particle dynamics during the collider design phase. This paper evaluates the limitations of existing models in weak-strong simulations, noting that while they accurately account for energy changes due to slingshot effects, they fail to incorporate longitudinal coordinate changes ($z$-variation). To address this gap, we introduce two novel transformations that enhance Hirata's original framework by including both $z$-variation and slingshot effect-induced energy changes. Through rigorous mathematical analysis and extensive weak-strong simulation studies, we validate the efficacy of these enhancements in achieving a more precise simulation of beam-beam interactions. Our results reveal that although $z$-variation constitutes a higher-order effect and does not substantially affect the emittance growth rate within the specific design parameters of the Electron-Ion Collider (EIC), the refined model offers improved accuracy, particularly in scenarios involving the interaction between beam-beam effects and other random diffusion processes, as well as in simulations incorporating realistic lattice models. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.03137v2-abstract-full').style.display = 'none'; document.getElementById('2403.03137v2-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> 20 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.13564">arXiv:2105.13564</a> <span> [<a href="https://arxiv.org/pdf/2105.13564">pdf</a>, <a href="https://arxiv.org/format/2105.13564">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"> Design concept for the second interaction region for Electron-Ion Collider </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gamage%2C+B+R">B. R. Gamage</a>, <a href="/search/physics?searchtype=author&query=Aschenauer%2C+E+-">E. -C. Aschenauer</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+J+S">J. S. Berg</a>, <a href="/search/physics?searchtype=author&query=Burkert%2C+V">V. Burkert</a>, <a href="/search/physics?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/physics?searchtype=author&query=Furletova%2C+Y">Y. Furletova</a>, <a href="/search/physics?searchtype=author&query=Higinbotham%2C+D">D. Higinbotham</a>, <a href="/search/physics?searchtype=author&query=Hutton%2C+A">A. Hutton</a>, <a href="/search/physics?searchtype=author&query=Hyde%2C+C">C. Hyde</a>, <a href="/search/physics?searchtype=author&query=Jentsch%2C+A">A. Jentsch</a>, <a href="/search/physics?searchtype=author&query=Kiselev%2C+A">A. Kiselev</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+F">F. Lin</a>, <a href="/search/physics?searchtype=author&query=Michalski%2C+T">T. Michalski</a>, <a href="/search/physics?searchtype=author&query=Montag%2C+C">C. Montag</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Nadel-Turonski%2C+P">P. Nadel-Turonski</a>, <a href="/search/physics?searchtype=author&query=Palmer%2C+R">R. Palmer</a>, <a href="/search/physics?searchtype=author&query=Parker%2C+B">B. Parker</a>, <a href="/search/physics?searchtype=author&query=Ptitsyn%2C+V">V. Ptitsyn</a>, <a href="/search/physics?searchtype=author&query=Rajput-Ghoshal%2C+R">R. Rajput-Ghoshal</a>, <a href="/search/physics?searchtype=author&query=Romanov%2C+D">D. Romanov</a>, <a href="/search/physics?searchtype=author&query=Satogata%2C+T">T. Satogata</a>, <a href="/search/physics?searchtype=author&query=Seryi%2C+A">A. Seryi</a>, <a href="/search/physics?searchtype=author&query=Sy%2C+A">A. Sy</a>, <a href="/search/physics?searchtype=author&query=Weiss%2C+C">C. Weiss</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="2105.13564v2-abstract-short" style="display: inline;"> The possibility of two interaction regions (IRs) is a design requirement for the Electron Ion Collider (the EIC). There is also a significant interest from the nuclear physics community in a 2nd IR with measurements capabilities complementary to those of the first IR. While the 2nd IR will be in operation over the entire energy range of ~20GeV to ~140GeV center of mass (CM). The 2nd IR can also pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.13564v2-abstract-full').style.display = 'inline'; document.getElementById('2105.13564v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.13564v2-abstract-full" style="display: none;"> The possibility of two interaction regions (IRs) is a design requirement for the Electron Ion Collider (the EIC). There is also a significant interest from the nuclear physics community in a 2nd IR with measurements capabilities complementary to those of the first IR. While the 2nd IR will be in operation over the entire energy range of ~20GeV to ~140GeV center of mass (CM). The 2nd IR can also provide an acceptance coverage complementary to that of the first. We present a brief overview and the current progress of the 2nd IR design in terms of the parameters, magnet layout, and beam dynamics. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.13564v2-abstract-full').style.display = 'none'; document.getElementById('2105.13564v2-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> 20 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">To be published in the proceedings of IPAC'21</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.11575">arXiv:2105.11575</a> <span> [<a href="https://arxiv.org/pdf/2105.11575">pdf</a>, <a href="https://arxiv.org/format/2105.11575">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2023.138058">10.1016/j.physletb.2023.138058 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On Possibilities of High Precision Fundamental Physics Experiments in Spin-Transparent Storage Rings of Low Energy Polarized Electron Beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Suleiman%2C+R">R. Suleiman</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2105.11575v3-abstract-short" style="display: inline;"> We present a new design of highly specialized small storage rings for low energy polarized electron beams. The new design is based on the transparent spin methodology that cancels the spin precession due to the magnetic dipole moment at any energy while allowing for spin precession induced by the fundamental physics of interest to accumulate. The buildup of the vertical component of beam polarizat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.11575v3-abstract-full').style.display = 'inline'; document.getElementById('2105.11575v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.11575v3-abstract-full" style="display: none;"> We present a new design of highly specialized small storage rings for low energy polarized electron beams. The new design is based on the transparent spin methodology that cancels the spin precession due to the magnetic dipole moment at any energy while allowing for spin precession induced by the fundamental physics of interest to accumulate. The buildup of the vertical component of beam polarization can be measured using standard Mott Polarimetry that is optimal at low electron energy. Systematic uncertainties are suppressed using counter-rotating bunched beams with various polarization orientations. These rings can be used to directly measure the permanent electric dipole moment of the electron, relevant to CP violation and matter-antimatter asymmetry in the universe, and to search for dark energy and ultra-light dark matter. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.11575v3-abstract-full').style.display = 'none'; document.getElementById('2105.11575v3-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 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Final edits</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.11469">arXiv:2003.11469</a> <span> [<a href="https://arxiv.org/pdf/2003.11469">pdf</a>, <a href="https://arxiv.org/format/2003.11469">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.124.194801">10.1103/PhysRevLett.124.194801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Transparent Spin Method for Spin Control of Hadron Beams in Colliders </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Filatov%2C+Y+N">Yu. N. Filatov</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A+M">A. M. Kondratenko</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+M+A">M. A. Kondratenko</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</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="2003.11469v2-abstract-short" style="display: inline;"> We present a concept for control of the ion polarization, called a transparent spin method. The spin transparency is achieved by designing such a synchrotron structure that the net spin rotation angle in one particle turn is zero. The polarization direction of any ions including deuterons can be efficiently controlled using weak quasi-static fields. These fields allow for dynamic adjustment of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.11469v2-abstract-full').style.display = 'inline'; document.getElementById('2003.11469v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.11469v2-abstract-full" style="display: none;"> We present a concept for control of the ion polarization, called a transparent spin method. The spin transparency is achieved by designing such a synchrotron structure that the net spin rotation angle in one particle turn is zero. The polarization direction of any ions including deuterons can be efficiently controlled using weak quasi-static fields. These fields allow for dynamic adjustment of the polarization direction during an experiment. The main features of the Transparent Spin method are illustrated in a figure-8 collider. The results are relevant to the Electron-Ion Collider considered in the US, the ion-ion collider NICA constructed in Russia, and a polarized Electron-ion collider planned in China. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.11469v2-abstract-full').style.display = 'none'; document.getElementById('2003.11469v2-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> 12 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 124, 194801 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1705.00051">arXiv:1705.00051</a> <span> [<a href="https://arxiv.org/pdf/1705.00051">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"> Very Asymmetric Collider for Dark Matter Search below 1 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Y. S. Derbenev</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="1705.00051v1-abstract-short" style="display: inline;"> Current searches for a dark photon in the mass range below 1 GeV require an electron-positron collider with a luminosity at the level of at least $10^{34}$ cm$^{-2}$s$^{-1}$. The challenge is that, at such low energies, the collider luminosity rapidly drops off due to increase in the beam sizes, strong mutual focusing of the colliding beams, and enhancement of collective effects. Using recent adva… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.00051v1-abstract-full').style.display = 'inline'; document.getElementById('1705.00051v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1705.00051v1-abstract-full" style="display: none;"> Current searches for a dark photon in the mass range below 1 GeV require an electron-positron collider with a luminosity at the level of at least $10^{34}$ cm$^{-2}$s$^{-1}$. The challenge is that, at such low energies, the collider luminosity rapidly drops off due to increase in the beam sizes, strong mutual focusing of the colliding beams, and enhancement of collective effects. Using recent advances in accelerator technology such as the nano-beam scheme of SuperKEK-B, high-current Energy Recovery Linacs (ERL), and magnetized beams, we propose a new configuration of an electron-positron collider based on a positron storage ring and an electron ERL. It allows one to achieve a luminosity of $>10^{34}$ cm$^{-2}$s$^{-1}$ at the center of momentum energy of <1 GeV. We present general considerations and a specific example of such a facility using the parameters of the SuperKEK-B positron storage ring and Cornell ERL project. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.00051v1-abstract-full').style.display = 'none'; document.getElementById('1705.00051v1-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 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2017. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1606.09117">arXiv:1606.09117</a> <span> [<a href="https://arxiv.org/pdf/1606.09117">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"> Study of Beam Synchronization at JLEIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+J">J. Guo</a>, <a href="/search/physics?searchtype=author&query=Hutton%2C+A">A. Hutton</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+F">F. Lin</a>, <a href="/search/physics?searchtype=author&query=Michalski%2C+T">T. Michalski</a>, <a href="/search/physics?searchtype=author&query=Nadel-Turonski%2C+P">P. Nadel-Turonski</a>, <a href="/search/physics?searchtype=author&query=Pilat%2C+F">F. Pilat</a>, <a href="/search/physics?searchtype=author&query=Rimmer%2C+R">R. Rimmer</a>, <a href="/search/physics?searchtype=author&query=Satogata%2C+T">T. Satogata</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+H">H. Wang</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+Y">Y. Zhang</a>, <a href="/search/physics?searchtype=author&query=Terzic%2C+B">B. Terzic</a>, <a href="/search/physics?searchtype=author&query=Wienands%2C+U">U. Wienands</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="1606.09117v1-abstract-short" style="display: inline;"> The ion collider ring of Jefferson Lab Electron-Ion Collider (JLEIC) accommodates a wide range of ion energies, from 20 to 100 GeV for protons or from 8 to 40 GeV per nucleon for lead ions. In this medium energy range, ions are not fully relativistic, which means values of their relativistic beta are slightly below 1, leading to an energy dependence of revolution time of the collider ring. On the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.09117v1-abstract-full').style.display = 'inline'; document.getElementById('1606.09117v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1606.09117v1-abstract-full" style="display: none;"> The ion collider ring of Jefferson Lab Electron-Ion Collider (JLEIC) accommodates a wide range of ion energies, from 20 to 100 GeV for protons or from 8 to 40 GeV per nucleon for lead ions. In this medium energy range, ions are not fully relativistic, which means values of their relativistic beta are slightly below 1, leading to an energy dependence of revolution time of the collider ring. On the other hand, electrons with energy 3 GeV and above are already ultra-relativistic such that their speeds are effectively equal to the speed of light. The difference in speeds of colliding electrons and ions in JLEIC, when translated into a path-length difference necessary to maintain the same timing between electron and ion bunches, is quite large. In this paper, we explore schemes for synchronizing the electron and ion bunches at a collision point as the ion energy is varied. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1606.09117v1-abstract-full').style.display = 'none'; document.getElementById('1606.09117v1-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 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1605.02594">arXiv:1605.02594</a> <span> [<a href="https://arxiv.org/pdf/1605.02594">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 Electron Cooler for Relativistic Ion Beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Lin%2C+F">F. Lin</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Y. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Douglas%2C+D">D. Douglas</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+J">J. Guo</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+R+P">R. P. Johnson</a>, <a href="/search/physics?searchtype=author&query=Krafft%2C+G">G. Krafft</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+Y">Y. Zhang</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="1605.02594v1-abstract-short" style="display: inline;"> Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron ra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.02594v1-abstract-full').style.display = 'inline'; document.getElementById('1605.02594v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.02594v1-abstract-full" style="display: none;"> Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron radiation damping of the electron beam. However, the range of ion energies where storage-ring electron cooling can be used has been limited by low electron beam damping rates at low ion energies and high equilibrium electron energy spread at high ion energies. This paper reports a development of a storage ring based cooler consisting of two sections with significantly different energies: the cooling and damping sections. The electron energy and other parameters in the cooling section are adjusted for optimum cooling of a stored ion beam. The beam parameters in the damping section are adjusted for optimum damping of the electron beam. The necessary energy difference is provided by an energy recovering SRF structure. A prototype linear optics of such storage-ring cooler and initial tracking simulations are presented and some potential issues such as coherent synchrotron radiation and beam break up are discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.02594v1-abstract-full').style.display = 'none'; document.getElementById('1605.02594v1-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 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">9 pages, 6 figures, 1 table, 2 equations</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.05632">arXiv:1604.05632</a> <span> [<a href="https://arxiv.org/pdf/1604.05632">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"> Ion Polarization Scheme for MEIC </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A+M">A. M. Kondratenko</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+M+A">M. A. Kondratenko</a>, <a href="/search/physics?searchtype=author&query=Filatov%2C+Y+N">Yu. N. Filatov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+F">F. Lin</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+Y">Y. Zhang</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="1604.05632v1-abstract-short" style="display: inline;"> The choice of a figure 8 shape for the booster and collider rings of MEIC opens wide possibilities for preservation of the ion polarization during beam acceleration as well as for control of the polarization at the collider's interaction points. As in the case of accelerators with Siberian snakes, the spin tune is energy independent but is equal to zero instead of one half. The figure-8 topology e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.05632v1-abstract-full').style.display = 'inline'; document.getElementById('1604.05632v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.05632v1-abstract-full" style="display: none;"> The choice of a figure 8 shape for the booster and collider rings of MEIC opens wide possibilities for preservation of the ion polarization during beam acceleration as well as for control of the polarization at the collider's interaction points. As in the case of accelerators with Siberian snakes, the spin tune is energy independent but is equal to zero instead of one half. The figure-8 topology eliminates the effect of arcs on the spin motion. There appears a unique opportunity to control the polarization of any particle species including deuterons, using longitudinal fields of small integrated strength (weak solenoids). Contrary to existing schemes, using weak solenoids in figure-8 colliders, one can control the polarization at the interaction points without essentially any effect on the beam's orbital characteristics. A universal scheme for control of the polarization using weak solenoids provides an elegant solution to the problem of ion acceleration completely eliminating resonant beam depolarization. It allows one to easily adjust the polarization in any direction at any orbital location, which becomes necessary when transferring the beam from one ring into another or when measuring the polarization by polarimeters. It also allows for an easy manipulation of the spin direction at an interaction point during an experiment. The latter feature allows one to set up a spin-flipping system with a spin reversal time of less than a second. By compensating the coherent part of the zero-integer spin resonance strength, which arises due to errors in alignment of the magnetic element of the lattice, one can reduce the field integrals of the control solenoids by a few orders of magnitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.05632v1-abstract-full').style.display = 'none'; document.getElementById('1604.05632v1-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 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1504.07961">arXiv:1504.07961</a> <span> [<a href="https://arxiv.org/pdf/1504.07961">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"> MEIC Design Summary </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Abeyratne%2C+S">S. Abeyratne</a>, <a href="/search/physics?searchtype=author&query=Barber%2C+D">D. Barber</a>, <a href="/search/physics?searchtype=author&query=Bogacz%2C+A">A. Bogacz</a>, <a href="/search/physics?searchtype=author&query=Brindza%2C+P">P. Brindza</a>, <a href="/search/physics?searchtype=author&query=Cai%2C+Y">Y. Cai</a>, <a href="/search/physics?searchtype=author&query=Camsonne%2C+A">A. Camsonne</a>, <a href="/search/physics?searchtype=author&query=Castilla%2C+A">A. Castilla</a>, <a href="/search/physics?searchtype=author&query=Chevtsov%2C+P">P. Chevtsov</a>, <a href="/search/physics?searchtype=author&query=Daly%2C+E">E. Daly</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Y. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Douglas%2C+D">D. Douglas</a>, <a href="/search/physics?searchtype=author&query=Dudnikov%2C+V">V. Dudnikov</a>, <a href="/search/physics?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/physics?searchtype=author&query=Erdelyi%2C+B">B. Erdelyi</a>, <a href="/search/physics?searchtype=author&query=Filatov%2C+Y">Y. Filatov</a>, <a href="/search/physics?searchtype=author&query=Gaskell%2C+D">D. Gaskell</a>, <a href="/search/physics?searchtype=author&query=Grames%2C+J">J. Grames</a>, <a href="/search/physics?searchtype=author&query=Guo%2C+J">J. Guo</a>, <a href="/search/physics?searchtype=author&query=Harwood%2C+L">L. Harwood</a>, <a href="/search/physics?searchtype=author&query=Hutton%2C+A">A. Hutton</a>, <a href="/search/physics?searchtype=author&query=Hyde%2C+C">C. Hyde</a>, <a href="/search/physics?searchtype=author&query=Jordan%2C+K">K. Jordan</a>, <a href="/search/physics?searchtype=author&query=Kimber%2C+A">A. Kimber</a>, <a href="/search/physics?searchtype=author&query=Krafft%2C+G+A">G. A. Krafft</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A">A. Kondratenko</a> , et al. (30 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1504.07961v1-abstract-short" style="display: inline;"> This document summarizes the design of Jefferson Lab's electron-ion collider, MEIC, as of January 20, 2015, and describes the facility whose cost was estimated for the United States Department of Energy Nuclear Sciences Advisory Committee EIC cost review of January 26-28, 2015. In particular, each of the main technical systems within the collider is presented to the level of the best current infor… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.07961v1-abstract-full').style.display = 'inline'; document.getElementById('1504.07961v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1504.07961v1-abstract-full" style="display: none;"> This document summarizes the design of Jefferson Lab's electron-ion collider, MEIC, as of January 20, 2015, and describes the facility whose cost was estimated for the United States Department of Energy Nuclear Sciences Advisory Committee EIC cost review of January 26-28, 2015. In particular, each of the main technical systems within the collider is presented to the level of the best current information. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1504.07961v1-abstract-full').style.display = 'none'; document.getElementById('1504.07961v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 April, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2015. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1401.8256">arXiv:1401.8256</a> <span> [<a href="https://arxiv.org/pdf/1401.8256">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"> Numerical Studies of Optimization and Aberration Correction Methods for the Preliminary Demonstration of the Parametric Ionization Cooling (PIC) Principle in the Twin Helix Muon Cooling Channel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Maloney%2C+J+A">J. A. Maloney</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+R+P">R. P. Johnson</a>, <a href="/search/physics?searchtype=author&query=Ankenbrandt%2C+C+A">C. A. Ankenbrandt</a>, <a href="/search/physics?searchtype=author&query=Yoshikawa%2C+C">C. Yoshikawa</a>, <a href="/search/physics?searchtype=author&query=Yonehara%2C+K">K. Yonehara</a>, <a href="/search/physics?searchtype=author&query=Neuffer%2C+D">D. Neuffer</a>, <a href="/search/physics?searchtype=author&query=Erdelyi%2C+B">B. Erdelyi</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="1401.8256v1-abstract-short" style="display: inline;"> Muon colliders have been proposed for the next generation of particle accelerators that study high-energy physics at the energy and intensity frontiers. In this paper we study a possible implementation of muon ionization cooling, Parametric-resonance Ionization Cooling (PIC), in the twin helix channel. The resonant cooling method of PIC offers the potential to reduce emittance beyond that achievab… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1401.8256v1-abstract-full').style.display = 'inline'; document.getElementById('1401.8256v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1401.8256v1-abstract-full" style="display: none;"> Muon colliders have been proposed for the next generation of particle accelerators that study high-energy physics at the energy and intensity frontiers. In this paper we study a possible implementation of muon ionization cooling, Parametric-resonance Ionization Cooling (PIC), in the twin helix channel. The resonant cooling method of PIC offers the potential to reduce emittance beyond that achievable with ionization cooling with ordinary magnetic focusing. We examine optimization of a variety of parameters, study the nonlinear dynamics in the twin helix channel and consider possible methods of aberration correction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1401.8256v1-abstract-full').style.display = 'none'; document.getElementById('1401.8256v1-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, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2014. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.1063">arXiv:1309.1063</a> <span> [<a href="https://arxiv.org/pdf/1309.1063">pdf</a>, <a href="https://arxiv.org/format/1309.1063">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevAccelBeams.20.091003">10.1103/PhysRevAccelBeams.20.091003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> One 4-Twist Helix Snake to Maintain Polarization in 8-120 GeV Proton Rings </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Antoulinakis%2C+F">F. Antoulinakis</a>, <a href="/search/physics?searchtype=author&query=Ljungman%2C+E+A">E. A. Ljungman</a>, <a href="/search/physics?searchtype=author&query=Tai%2C+A">A. Tai</a>, <a href="/search/physics?searchtype=author&query=Aidala%2C+C+A">C. A. Aidala</a>, <a href="/search/physics?searchtype=author&query=Courant%2C+E+D">E. D. Courant</a>, <a href="/search/physics?searchtype=author&query=Krisch%2C+A+D">A. D. Krisch</a>, <a href="/search/physics?searchtype=author&query=Lorenzon%2C+W">W. Lorenzon</a>, <a href="/search/physics?searchtype=author&query=Myers%2C+P+D">P. D. Myers</a>, <a href="/search/physics?searchtype=author&query=Raymond%2C+R+S">R. S. Raymond</a>, <a href="/search/physics?searchtype=author&query=Sivers%2C+D+W">D. W. Sivers</a>, <a href="/search/physics?searchtype=author&query=Leonova%2C+M+A">M. A. Leonova</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Y. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A+M">A. M. Kondratenko</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="1309.1063v1-abstract-short" style="display: inline;"> Solenoid Siberian snakes have successfully maintained polarization in particle rings below 1 GeV, but never in multi-GeV rings because the Lorentz contraction of a solenoid's integral B dl would require impractically long high-field solenoids. High energy rings, such as Brookhaven's 255 GeV Relativistic Heavy Ion Collider (RHIC), use only odd multiples of pairs of transverse B-field Siberian snake… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.1063v1-abstract-full').style.display = 'inline'; document.getElementById('1309.1063v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.1063v1-abstract-full" style="display: none;"> Solenoid Siberian snakes have successfully maintained polarization in particle rings below 1 GeV, but never in multi-GeV rings because the Lorentz contraction of a solenoid's integral B dl would require impractically long high-field solenoids. High energy rings, such as Brookhaven's 255 GeV Relativistic Heavy Ion Collider (RHIC), use only odd multiples of pairs of transverse B-field Siberian snakes directly opposite each other. When it became impractical to use a pair of Siberian Snakes in Fermilab's 120 GeV Main Injector, we searched for a new type of single Siberian snake, which should overcome all depolarizing resonances in the 8.9 - 120 GeV range. We found that one snake made of one 4-twist helix and 2 short dipoles could maintain the polarization. This snake design might also be used at other rings, such as Japan's 30 GeV J-PARC, the 12 - 24 GeV NICA proton-deuteron collider at JINR-Dubna, and perhaps RHIC's injector, the 25 GeV AGS. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.1063v1-abstract-full').style.display = 'none'; document.getElementById('1309.1063v1-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 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">4 pages, 2 figures, 1 table</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Accel. Beams 20, 091003 (2017) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1208.3405">arXiv:1208.3405</a> <span> [<a href="https://arxiv.org/pdf/1208.3405">pdf</a>, <a href="https://arxiv.org/ps/1208.3405">ps</a>, <a href="https://arxiv.org/format/1208.3405">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevSTAB.16.011004">10.1103/PhysRevSTAB.16.011004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Symmetric achromatic low-beta collider interaction region design concept </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+F">F. Lin</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+R+P">R. P. Johnson</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="1208.3405v1-abstract-short" style="display: inline;"> We present a new symmetry-based concept for an achromatic low-beta collider interaction region design. A specially-designed symmetric Chromaticity Compensation Block (CCB) induces an angle spread in the passing beam such that it cancels the chromatic kick of the final focusing quadrupoles. Two such CCBs placed symmetrically around an interaction point allow simultaneous compensation of the 1st-ord… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1208.3405v1-abstract-full').style.display = 'inline'; document.getElementById('1208.3405v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1208.3405v1-abstract-full" style="display: none;"> We present a new symmetry-based concept for an achromatic low-beta collider interaction region design. A specially-designed symmetric Chromaticity Compensation Block (CCB) induces an angle spread in the passing beam such that it cancels the chromatic kick of the final focusing quadrupoles. Two such CCBs placed symmetrically around an interaction point allow simultaneous compensation of the 1st-order chromaticities and chromatic beam smear at the IP without inducing significant 2nd-order aberrations to the particle trajectory. We first develop an analytic description of this approach and explicitly formulate 2nd-order aberration compensation conditions at the interaction point. The concept is next applied to develop an interaction region design for the ion collider ring of an electron-ion collider. We numerically evaluate performance of the design in terms of momentum acceptance and dynamic aperture. The advantages of the new concept are illustrated by comparing it to the conventional distributed-sextupole chromaticity compensation scheme. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1208.3405v1-abstract-full').style.display = 'none'; document.getElementById('1208.3405v1-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 August, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">12 pages, 17 figures, to be submitted to Phys. Rev. ST Accel. Beams</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.3476">arXiv:1205.3476</a> <span> [<a href="https://arxiv.org/pdf/1205.3476">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Parametric-resonance Ionization Cooling of Muon Beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Afanasev%2C+A">A. Afanasev</a>, <a href="/search/physics?searchtype=author&query=Beard%2C+K+B">K. B. Beard</a>, <a href="/search/physics?searchtype=author&query=Johnson%2C+R">R. Johnson</a>, <a href="/search/physics?searchtype=author&query=Erdelyi%2C+B">B. Erdelyi</a>, <a href="/search/physics?searchtype=author&query=Maloney%2C+J+A">J. A. Maloney</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="1205.3476v1-abstract-short" style="display: inline;"> Cooling of muon beams for the next-generation lepton collider is necessary to achieve its higher luminosity with fewer muons. In this paper we present an idea to combine ionization cooling with parametric resonances that is expected to lead to muon beams with much smaller transverse sizes. We describe a linear magnetic transport channel where a half integer resonance is induced such that the norma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.3476v1-abstract-full').style.display = 'inline'; document.getElementById('1205.3476v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.3476v1-abstract-full" style="display: none;"> Cooling of muon beams for the next-generation lepton collider is necessary to achieve its higher luminosity with fewer muons. In this paper we present an idea to combine ionization cooling with parametric resonances that is expected to lead to muon beams with much smaller transverse sizes. We describe a linear magnetic transport channel where a half integer resonance is induced such that the normal elliptical motion of particles in x-x' phase space becomes hyperbolic, with particles moving to smaller x and larger x' at the channel focal points. Thin absorbers placed at the focal points of the channel then cool the angular divergence of the beam by the usual ionization cooling mechanism where each absorber is followed by RF cavities. We present a theory of Parametric-resonance Ionization Cooling (PIC), starting with the basic principles in the context of a simple quadrupole-focused beam line. Then we discuss detuning caused by chromatic, spherical, and non-linear field aberrations and the techniques needed to reduce the detuning. We discuss the requirement that PIC be accompanied by emittance exchange in order to keep the momentum spread sufficiently small. Examples of PIC channel are presented, along with computer simulations aimed at practical implementation of the described theoretical concept. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.3476v1-abstract-full').style.display = 'none'; document.getElementById('1205.3476v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">44 pages, 17 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/1204.6002">arXiv:1204.6002</a> <span> [<a href="https://arxiv.org/pdf/1204.6002">pdf</a>, <a href="https://arxiv.org/ps/1204.6002">ps</a>, <a href="https://arxiv.org/format/1204.6002">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.108.074801">10.1103/PhysRevLett.108.074801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Higher Order Spin Resonances in a 2.1 GeV/c Polarized Proton Beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Leonova%2C+M+A">M. A. Leonova</a>, <a href="/search/physics?searchtype=author&query=Askari%2C+J+A">J. A. Askari</a>, <a href="/search/physics?searchtype=author&query=Gordon%2C+K+N">K. N. Gordon</a>, <a href="/search/physics?searchtype=author&query=Krisch%2C+A+D">A. D. Krisch</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Nees%2C+D+A">D. A. Nees</a>, <a href="/search/physics?searchtype=author&query=Raymond%2C+R+S">R. S. Raymond</a>, <a href="/search/physics?searchtype=author&query=Sivers%2C+D+W">D. W. Sivers</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+V+K">V. K. Wong</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+F">F. Hinterberger</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="1204.6002v1-abstract-short" style="display: inline;"> Spin resonances can depolarize or spin-flip a polarized beam. We studied 1st and higher order spin resonances with stored 2.1 GeV/c vertically polarized protons. The 1st order vertical (谓y) resonance caused almost full spin-flip, while some higher order 谓y resonances caused partial depolarization. The 1st order horizontal (谓x) resonance caused almost full depolarization, while some higher order 谓x… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.6002v1-abstract-full').style.display = 'inline'; document.getElementById('1204.6002v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1204.6002v1-abstract-full" style="display: none;"> Spin resonances can depolarize or spin-flip a polarized beam. We studied 1st and higher order spin resonances with stored 2.1 GeV/c vertically polarized protons. The 1st order vertical (谓y) resonance caused almost full spin-flip, while some higher order 谓y resonances caused partial depolarization. The 1st order horizontal (谓x) resonance caused almost full depolarization, while some higher order 谓x resonances again caused partial depolarization. Moreover, a 2nd order 谓x resonance is about as strong as some 3rd order 谓x resonances, while some 3rd order 谓y resonances are much stronger than a 2nd order 谓y resonance. One thought that 谓y spin resonances are far stronger than 谓x, and that lower order resonances are stronger than higher order; the data do not support this. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1204.6002v1-abstract-full').style.display = 'none'; document.getElementById('1204.6002v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 April, 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">5 pages, 5 figures Note that Fig. 5 did not appear in the PRL due to space limitation, but did appear in the March 2012 CERN Courier News Item "Results from SPIN@COSY may bode well for RHIC"</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review Letters 108, 074801 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1110.3042">arXiv:1110.3042</a> <span> [<a href="https://arxiv.org/pdf/1110.3042">pdf</a>, <a href="https://arxiv.org/ps/1110.3042">ps</a>, <a href="https://arxiv.org/format/1110.3042">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Updated Report Acceleration of Polarized Protons to 120-150 GeV/c at Fermilab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Courant%2C+E+D">E. D. Courant</a>, <a href="/search/physics?searchtype=author&query=Krisch%2C+A+D">A. D. Krisch</a>, <a href="/search/physics?searchtype=author&query=Leonova%2C+M+A">M. A. Leonova</a>, <a href="/search/physics?searchtype=author&query=Lin%2C+A+M+T">A. M. T. Lin</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/physics?searchtype=author&query=Lorenzon%2C+W">W. Lorenzon</a>, <a href="/search/physics?searchtype=author&query=Nees%2C+D+A">D. A. Nees</a>, <a href="/search/physics?searchtype=author&query=Raymond%2C+R+S">R. S. Raymond</a>, <a href="/search/physics?searchtype=author&query=Sivers%2C+D+W">D. W. Sivers</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+V+K">V. K. Wong</a>, <a href="/search/physics?searchtype=author&query=Kourbanis%2C+I">I. Kourbanis</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Crabb%2C+D+G">D. G. Crabb</a>, <a href="/search/physics?searchtype=author&query=Reimer%2C+P+E">P. E. Reimer</a>, <a href="/search/physics?searchtype=author&query=O%27Fallon%2C+J+R">J. R. O'Fallon</a>, <a href="/search/physics?searchtype=author&query=Fidecaro%2C+G">G. Fidecaro</a>, <a href="/search/physics?searchtype=author&query=Fidecaro%2C+M">M. Fidecaro</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+F">F. Hinterberger</a>, <a href="/search/physics?searchtype=author&query=Troshin%2C+S+M">S. M. Troshin</a>, <a href="/search/physics?searchtype=author&query=Ukhanov%2C+M+N">M. N. Ukhanov</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A+M">A. M. Kondratenko</a>, <a href="/search/physics?searchtype=author&query=van+Oers%2C+W+T+H">W. T. H. van Oers</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="1110.3042v1-abstract-short" style="display: inline;"> The SPIN@FERMI collaboration has updated its 1991-95 Reports on the acceleration of polarized protons in Fermilab's Main Injector, which was commissioned by Fermilab. This Updated Report summarizes some updated Physics Goals for a 120-150 GeV/c polarized proton beam. It also contains an updated discussion of the Modifications and Hardware needed for a polarized beam in the Main Injector, along wit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1110.3042v1-abstract-full').style.display = 'inline'; document.getElementById('1110.3042v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1110.3042v1-abstract-full" style="display: none;"> The SPIN@FERMI collaboration has updated its 1991-95 Reports on the acceleration of polarized protons in Fermilab's Main Injector, which was commissioned by Fermilab. This Updated Report summarizes some updated Physics Goals for a 120-150 GeV/c polarized proton beam. It also contains an updated discussion of the Modifications and Hardware needed for a polarized beam in the Main Injector, along with an updated Schedule and Budget. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1110.3042v1-abstract-full').style.display = 'none'; document.getElementById('1110.3042v1-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> 12 October, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">30 pages, 12 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/1001.1456">arXiv:1001.1456</a> <span> [<a href="https://arxiv.org/pdf/1001.1456">pdf</a>, <a href="https://arxiv.org/ps/1001.1456">ps</a>, <a href="https://arxiv.org/format/1001.1456">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"> Wide spin resonance with an rf-bunched proton beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Chao%2C+A+W">A. W. Chao</a>, <a href="/search/physics?searchtype=author&query=Krisch%2C+A+D">A. D. Krisch</a>, <a href="/search/physics?searchtype=author&query=Leonova%2C+M+A">M. A. Leonova</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+J">J. Liu</a>, <a href="/search/physics?searchtype=author&query=Raymond%2C+R+S">R. S. Raymond</a>, <a href="/search/physics?searchtype=author&query=Sivers%2C+D+W">D. W. Sivers</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+V+K">V. K. Wong</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A+M">A. M. Kondratenko</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1001.1456v1-abstract-short" style="display: inline;"> We recently used an rf solenoid to study the widths of rf spin resonances with both unbunched and bunched beams of 2.1 GeV_c polarized protons stored in the COSY synchrotron. A map, with unbunched beam at different fixed rf-solenoid frequencies, showed a very shallow possible depolarization dip at the resonance. Next we made frequency sweeps of 400Hz, centered at similar frequencies, which great… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.1456v1-abstract-full').style.display = 'inline'; document.getElementById('1001.1456v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1001.1456v1-abstract-full" style="display: none;"> We recently used an rf solenoid to study the widths of rf spin resonances with both unbunched and bunched beams of 2.1 GeV_c polarized protons stored in the COSY synchrotron. A map, with unbunched beam at different fixed rf-solenoid frequencies, showed a very shallow possible depolarization dip at the resonance. Next we made frequency sweeps of 400Hz, centered at similar frequencies, which greatly enhanced the dip. But, with a bunched proton beam, both the fixed-frequency and frequency-sweep techniques produced similar maps, and both bunched maps showed full beam depolarization over a wide region. Moreover, both were more than twice as wide as the unbunched dip. This widening of the proton resonance due to bunching is exactly opposite to the recently observed narrowing of deuteron resonances due to bunching. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1001.1456v1-abstract-full').style.display = 'none'; document.getElementById('1001.1456v1-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 January, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 2 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/0901.2564">arXiv:0901.2564</a> <span>  </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"> Spin resonance strengths due to rf solenoids and dipoles for stored deuteron beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Leonova%2C+M+A">M. A. Leonova</a>, <a href="/search/physics?searchtype=author&query=Chao%2C+A+W">A. W. Chao</a>, <a href="/search/physics?searchtype=author&query=Courant%2C+E+D">E. D. Courant</a>, <a href="/search/physics?searchtype=author&query=Krisch%2C+A+D">A. D. Krisch</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Raymond%2C+R+S">R. S. Raymond</a>, <a href="/search/physics?searchtype=author&query=Sivers%2C+D+W">D. W. Sivers</a>, <a href="/search/physics?searchtype=author&query=Williams%2C+J+M">J. M. Williams</a>, <a href="/search/physics?searchtype=author&query=Wong%2C+V+K">V. K. Wong</a>, <a href="/search/physics?searchtype=author&query=Garishvili%2C+A">A. Garishvili</a>, <a href="/search/physics?searchtype=author&query=Gebel%2C+R">R. Gebel</a>, <a href="/search/physics?searchtype=author&query=Lehrach%2C+A">A. Lehrach</a>, <a href="/search/physics?searchtype=author&query=Lorentz%2C+B">B. Lorentz</a>, <a href="/search/physics?searchtype=author&query=Maier%2C+R">R. Maier</a>, <a href="/search/physics?searchtype=author&query=Prasuhn%2C+D">D. Prasuhn</a>, <a href="/search/physics?searchtype=author&query=Stockhorst%2C+H">H. Stockhorst</a>, <a href="/search/physics?searchtype=author&query=Welsch%2C+D">D. Welsch</a>, <a href="/search/physics?searchtype=author&query=Hinterberger%2C+F">F. Hinterberger</a>, <a href="/search/physics?searchtype=author&query=Ulbrich%2C+K">K. Ulbrich</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Ya. S. Derbenev</a>, <a href="/search/physics?searchtype=author&query=Kondratenko%2C+A+M">A. M. Kondratenko</a>, <a href="/search/physics?searchtype=author&query=Orlov%2C+Y+F">Y. F. Orlov</a>, <a href="/search/physics?searchtype=author&query=Stephenson%2C+E+J">E. J. Stephenson</a>, <a href="/search/physics?searchtype=author&query=Brantjes%2C+N+P+M">N. P. M. Brantjes</a>, <a href="/search/physics?searchtype=author&query=Onderwater%2C+C+J+G">C. J. G. Onderwater</a> , et al. (1 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="0901.2564v2-abstract-short" style="display: inline;"> This submission was withdrawn because of an unresolved dispute between the authors [arXiv admin 2009-4-13]. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0901.2564v2-abstract-full" style="display: none;"> This submission was withdrawn because of an unresolved dispute between the authors [arXiv admin 2009-4-13]. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0901.2564v2-abstract-full').style.display = 'none'; document.getElementById('0901.2564v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 April, 2009; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 January, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">This submission was withdrawn because of an unresolved dispute between the authors [arXiv admin 2009-4-13]</span> </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"> 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