Demonstration of Muon-Beam Transverse Phase-Space Compression
A. Antognini, N. J. Ayres, I. Belosevic, V. Bondar, A. Eggenberger, M. Hildebrandt, R. Iwai, D. M. Kaplan, K. S. Khaw, K. Kirch, A. Knecht, A. Papa, C. Petitjea… 展开作者
A. Antognini, N. J. Ayres, I. Belosevic, V. Bondar, A. Eggenberger, M. Hildebrandt, R. Iwai, D. M. Kaplan, K. S. Khaw, K. Kirch, A. Knecht, A. Papa, C. Petitjean, T. J. Phillips, F. M. Piegsa, N. Ritjoho, A. Stoykov, D. Taqqu, G. Wichmann
备注：
6 pages, 7 figures; accepted for publication in Phys. Rev. Lett
We demonstrate efficient transverse compression of a 12.5 MeV/c muon beam stopped in a helium gas target featuring a vertical density gradient and crossed electric and magnetic fields. The muon stop distribution extending vertically over 14 mm was reduced to a 0.25 mm size (RMS) within 3.5 $μ$s. The simulation including cross sections for low-energy $μ^+$-$\text{He}$ elastic and charge exchange ($μ^+\leftrightarrow $ muonium) collisions describes the measurements well. By combining the transverse compression stage with a previously demonstrated longitudinal compression stage, we can improve the phase space density of a $μ^+ $ beam by a factor of $ 10^{10} $ with $ 10^{-3} $ efficiency.
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
Fast cycling HTS based superconducting accelerator magnets: Feasibility study and readiness demonstration program driven by neutrino physics and muon collider needs
高能效快循环加速器磁体的开发对下一代中微子研究质子快循环同步加速器（RCS）和未来μ子对撞机的助推加速器至关重要。我们看到了一个独特的机会，有这样的磁铁建立在高温超导体（HTS）的基础上。除了在相对较高的温度下具有超导性之外，与低温NbTi超导体电缆相比，稀土高温超导带显示出非常小的交流损耗。最近对基于HTS的0.5 m长双孔超导加速器磁体的测试表明，在10 Hz重复频率和0.5 T B场跨度下，具有约300 T/s的高dB/dt斜坡率。在6 K冷却中没有观察到温度升高He在0.003K误差内，将磁体导体线圈中的低温功率损耗的上限设置为小于0.2W/m。基于这一结果，我们概述了该测试磁体设计的可能升级，即在10 mm束隙中将其升级为2 T B场，dB/dt斜升速率高达1000 T/s。该短样品磁体的功率测试结果将用于预测低温和电功率损耗，作为磁体B场和dB/dt斜升速率的函数。然后，这些预测将被缩放到预期的加速器磁体束隙和质子和μ子RCS加速器的B场的范围。我们邀请合作者加入这些研究，并呼吁支持旨在全面展示这种方法的研发计划，包括到2028年对基于HTS的快速循环加速器磁体的长原型进行设计，建造和功率测试。
Feasibility demonstration of a high-momentum, high-purity muon beamline at the J-PARC Hadron Experimental Facility
Research Center for Nuclear Physics (RCNP), The University of Osaka（大阪大学核物理研究中心）；Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)（高能加速器研究机构粒子与核研究研究所）；Institute of Physics, Academia Sinica（中央研究院物理学研究所）；Department of Physics, Graduate school of Science, Kyoto University（京都大学理学研究科物理学系）；Department of Physics, Graduate School of Science, The University of Osaka（大阪大学理学研究科物理学系）；Center for Science Adventure and Collaborative Research Advancement (SACRA), Graduate school of Science, Kyoto University（京都大学理学研究科科学冒险与协同研究推进中心）
Single-Shot High-Energy Muon and Particle Radiography with a Multi-GeV Laser-Wakefield-Accelerator-Driven Source
Colorado State University（科罗拉多州立大学）；Lawrence Livermore National Laboratory（劳伦斯利弗莫尔国家实验室）；ELI Beamlines Facility, The Extreme Light Infrastructure ERIC（ELI光束线设施，极端光基础设施ERIC）；Institute for Research in Electronics and Applied Physics, University of Maryland（马里兰大学电子与应用物理研究所）；Czech Technical University in Prague（布拉格捷克技术大学）
