Investigation of spin rotators in CEPC at the Z-pole
Investigation of spin rotators in CEPC at the Z-pole
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DOI：
10.1007/s41605-022-00344-2
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发表时间：
2022-04
影响因子：
0.6
通讯作者：
W. Xia;Z. Duan;Jie Gao;Yiwei Wang
中科院分区：
文献类型：
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作者：
W. Xia;Z. Duan;Jie Gao;Yiwei Wang
纵向极化是未来100公里级环形电子位置对撞机（CEPC）的一个重要设计方向。在CEPC对撞机环中需要自旋旋转器来使束流在相互作用点处的偏振方向沿着纵向。本文重点研究了Z极（45.6GeV）CEPC自旋旋转器的设计。方法采用螺线管磁体和水平弯曲磁体两种截面，设计了Z极CEPC自旋旋转器。用四极透镜补偿了由双折射引入的横向运动耦合。对布局进行了调整，以将自旋旋转器实现到对撞机环中。结果在带有自旋旋转器的IP上可以实现纵向偏振光束。高偏振度是可以达到的，而自旋旋转器对轨道运动的影响是可以接受的。详细的模拟结果将presented.ConclusionA螺线管为基础的自旋旋转器配置的设计和集成到CEPC对撞机环形晶格。仿真结果表明，该方案能够满足极化要求。
PurposeLongitudinal polarization is an important design aspect of the future 100 km-scale Circular Electron Position Collider (CEPC). Spin rotators are needed in the CEPC collider rings to make the beam polarization along the longitudinal direction at the interaction points (IPs). This paper focuses on the design of spin rotators for CEPC at theZ-pole (45.6 GeV).MethodsThe design of spin rotators in the CEPC at theZ-pole is based on solenoid magnets and horizontal bending magnets sections. The coupling of transverse motion introduced by solenoids is compensated with quadrupole lenses. Adjustments have been made to the layout to implement the spin rotators into the collider rings.ResultsLongitudinal polarized beam can be achieved at the IPs with the spin rotators. High degree of polarization is attainable, while the effect of spin rotators on orbital motion is acceptable. The detailed simulation results will be presented.ConclusionA solenoid-based spin rotator configuration is designed and integrated into the CEPC collider ring lattice. According to the simulation results, the polarization requirements can be satisfied.