Evaluation of radiative depolarization in the future circular electron-positron collider
Evaluation of radiative depolarization in the future circular electron-positron collider
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DOI：
10.1103/physrevaccelbeams.26.091001
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发表时间：
2022-04
影响因子：
1.7
通讯作者：
W. Xia;Z. Duan;D. Barber;Yiwei Wang;Bin Wang;Jie Gao
中科院分区：
文献类型：
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作者：
W. Xia;Z. Duan;D. Barber;Yiwei Wang;Bin Wang;Jie Gao
偏振轻子束是未来百公里级圆形正负电子对撞机（CEPC）设计的一个重要方面。使用共振去偏以及纵向偏振碰撞光束的精确光束能量校准正在积极研究中。各种光束能量和应用场景可实现的光束偏振水平取决于对撞环中的辐射去偏振。本文评估了 CEPC 对撞机环晶格的辐射去极化效应，并进行了详细的机器缺陷和修正。将使用 Bmad/PTC 代码的 SLIM 和蒙特卡罗方法的模拟与超高束能量的自旋扩散效应理论进行比较，从而解决了该理论的有效性。本文最后对进一步研究进行了总结和建议。
Polarized lepton beams are an important aspect in the design of the future 100 km-scale Circular Electron-Positron Collider (CEPC). Precision beam energy calibration using resonant depolarization, as well as longitudinally polarized colliding beams are being actively investigated. The achievable beam polarization level for various beam energies and application scenarios depends on the radiative depolarization in the collider rings. In this paper the radiative depolarization effects are evaluated for a CEPC collider ring lattice with detailed machine imperfections and corrections. Simulations with the SLIM and Monte-Carlo approaches using the Bmad/PTC codes are compared with the theory of the effects of spin diffusion for ultra-high beam energies and the validity of the theories is thereby addressed. The paper concludes with a summary and suggestions for further investigations.