Analysis and mitigation of bump magnetic field tracking errors in a multiturn injection system  

作　　者：Shuaishuai Zhang Guodong Shen Weiping Chai Jingjing Zhang Hongliang Guo Lingxiao Hou Liping Yao Shuang Ruan Jiancheng Yang 

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou,730000,China [2]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Radiation Detection Technology and Methods》2023年第4期531-544,共14页辐射探测技术与方法（英文）

基　　金：supported by the Youth Innovation Promotion Association of the Chinese Academy of Sciences program(No.2021417).The critical discussions with colleagues in the accelerator physics and hardware groups at IMP are also greatly appreciated.

摘　　要：Purpose The Space Environment Simulation and Research Infrastructure(SESRI)is a cluster of accelerators designed to simulate the cosmic radiation environment by generating particles of various types and energies.Among these accelerators,a synchrotron in the 300 MeV proton and heavy ion accelerator complex utilizes a multiturn injection scheme with four bump magnets to accumulate proton and heavy ion beams effectively.However,the bump magnetic field experiences a rapid drop rate of up to 1000 T/s,inevitably leading to a deviation(field tracking error)from the ideal magnetic field.The injection efficiency and particle distribution are significantly affected by this field tracking error,as evaluated by the ACCSIM code.Method During the device testing stage,the sources of field tracking errors were identified by analysis of the bump power supplies and the field of the magnets.Mitigation techniques were then implemented to reduce the field tracking error from[Math Processing Error]to[Math Processing Error]throughout the entire power supply,transmission cable,and magnet chain.Results Moreover,the successful injection and accumulation of beams during the operational phase of the synchrotron confirmed the effectiveness of the proposed mitigation methods.Additionally,a magnetic field measurement system was developed to monitor the magnetic field tracking error online.Conclusion The combination of the field tracking error mitigation methods and the measurement system provides valuable guidance for optimizing the magnetic fields with rapid drop rates.

关 键 词：SESRI Multiturn injection Bump magnet Field tracking error mitigation 

分 类 号：O57[理学—粒子物理与原子核物理]