Investigation of spin rotators in CEPC at the Z-pole  

作　　者：Wenhao Xia Zhe Duan Jie Gao Yiwei Wang 

机构地区：[1]Key Laboratory of Particle Acceleration Physics and Technology,Institute of High Energy Physics,Chinese Academy of Sciences,19B Yuquan Road,Beijing 100049,China [2]University of Chinese Academy of Sciences,19A Yuquan Road,Beijing 100049,China

出　　处：《Radiation Detection Technology and Methods》2022年第4期490-501,共12页辐射探测技术与方法（英文）

基　　金：supported by National Natural Science Foundation of China(Grant No.11975252);NationalKey Program for S&T Research andDevelopment(Grant No.2016YFA0400400 and 2018YFA0404300);Key Research Program of Frontier Sciences,CAS(Grant No.QYZDJ-SSW-SLH004);Youth Innovation Promotion Association CAS(No.2021012).

摘　　要：Purpose Longitudinal 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 the Z-pole(45.6 GeV).Methods The design of spin rotators in the CEPC at the Z-pole is based on solenoidmagnets 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.Results Longitudinal 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.Conclusion A 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.

关 键 词：Beam polarization Spin rotator Electron storage ring CEPC Z-pole 

分 类 号：O57[理学—粒子物理与原子核物理]