An ionization cooling channel for muon beams based on alternating solenoids

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) Pub Date : 1999-04-16 DOI:10.1109/PAC.1999.792136

J. Gallardo, R. Fernow, H. Kirk, R. Palmer, P. Lebrun, A. Moretti, A. Tollestrup, D. Kaplan, Y. Fukui

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引用次数: 7

Abstract

The muon collider requires intense, cooled muon bunches to reach the required luminosity. Due to the limited lifetime of the muon, the cooling process must take place very rapidly. Ionization cooling seems to be our only option, given the large emittances of the muon beam from pion decay. However, this ionization cooling method has been found quite difficult to implement in practice. We describe a scheme based on the use of liquid hydrogen absorbers followed by RF cavities ("pillbox" or "open iris" type), embedded in a transport lattice based on high field solenoids. These solenoidal fields are reversed periodically in order to suppress the growth of the canonical angular momentum. This channel has been simulated in detail with independent codes, featuring conventional tracking in e.m. fields and detailed simulation of multiple scattering and straggling in the the absorbers and windows. These calculations show that the 15 Tesla lattice cools in 6D phase space by a factor /spl ap/2 over a distance of 20 m.

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一种基于交变螺线管的介子光束的电离冷却通道

介子对撞机需要强烈的、冷却的介子束来达到所需的亮度。由于μ子的寿命有限，冷却过程必须非常迅速地进行。电离冷却似乎是我们唯一的选择，因为介子衰变产生的介子束发射强度很大。然而，这种电离冷却方法在实践中很难实现。我们描述了一种基于使用液氢吸收剂的方案，然后是射频腔(“药盒”或“开放虹膜”型)，嵌入基于高场螺线管的输运晶格中。为了抑制正则角动量的增长，这些螺线管场周期性地反转。用独立的编码对该信道进行了详细的模拟，包括在电磁场中进行常规跟踪和在吸收器和窗口中进行多次散射和离散的详细模拟。这些计算表明，15特斯拉晶格在6D相空间中，在20 m的距离上以一个系数/spl ap/2的速度冷却。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)

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