High Field – Low Energy Muon Ionization Cooling Channel
High Field – Low Energy Muon Ionization Cooling Channel
复制标题
高场-低能量μ子电离冷却通道
DOI：
10.1103/physrevstab.18.091001
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
R. Palmer
中科院分区：
文献类型：
--
作者：
H. Sayed;R. Palmer
产生的μ子束具有大的横向和纵向发射度。为了实现μ子对撞机所需的低发射度，在μ子的短寿命内，需要电离冷却。冷却方案已被开发，以减少μ子束的6D发射度在横向上为300 μm-rad，纵向尺寸为1.1 -1.5 mm。为了满足高能μ子对撞机的亮度要求，必须进一步将横向发射度降低到50-25 μm-rad，纵向发射度的上限为76 mm。早期的研究表明，在高场磁体中低能μ子束的横向冷却具有良好的性能，但不包括级之间的横向或纵向匹配。在这项研究中，我们提出了第一个完整的设计的高场低能量电离冷却通道的横向和纵向匹配。通道设计是基于强聚焦束流，场为25-30 T，低动量μ子束从135 MeV/c开始逐渐减少。本文提出的冷却通道设计是第一个达到150微米尺度发射束的设计。最后给出了该通道的优化设计参数，包括聚焦场、吸收体参数以及横向和纵向匹配。«少
Muon beams are generated with large transverse and longitudinal emittances. In order to achieve the low emittances required by a muon collider, within the short lifetime of the muons, ionization cooling is required. Cooling schemes have been developed to reduce the muon beam 6D emittances to ≈ 300 μm–rad in transverse and ≈ 1–1.5 mm in longitudinal dimensions. The transverse emittance has to be further reduced to ≈ 50–25 μm–rad with an upper limit on the longitudinal emittance of ≈ 76 mm in order to meet the high-energy muon collider luminosity requirements. Earlier studies of the transverse cooling of low energy muon beams in high field magnets showed a promising performance, but did not include transverse or longitudinal matching between the stages. In this study we present the first complete design of the high field-low energy ionization cooling channel with transverse and longitudinal matching. The channel design was based on strong focusing solenoids with fields of 25–30 T and low momentum muon beam starting at 135 MeV/c and gradually decreasing. The cooling channel design presented here is the first to reach ≈ 50 micron scale emittance beam. As a result, we present the channel’s optimized design parameters including the focusingmore » solenoid fields, absorber parameters and the transverse and longitudinal matching.« less