Research and development of the longitudinal feedback system digital signal processing electronics in BEPCII  

作　　者：Di Yin Junhui Yue Huizhou Ma Jianshe Cao Shujun Wei Cunbiao Hao Yanfeng Sui Jun He Jingxia Zhao Zhi Liu 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,People’s Republic of China 2 Accelerator Technology and Key Laboratory [2]of Academy of Physics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,People’s Republic of China [3]University of Chinese Academy Sciences,Beijing 100049,People’s Republic of China

出　　处：《Radiation Detection Technology and Methods》2021年第2期213-219,共7页辐射探测技术与方法（英文）

摘　　要：Background The current strategy to achieve high luminosity for high energy physics experiments is to store huge currents distributed in many bunches in circular machines such as BEPCII,so the longitudinal coupled bunch instabilities of the beam are inevitable.Purpose Therefore,a longitudinal feedback system is needed to suppress longitudinal oscillation.Otherwise,the beam energy spread will increase;the luminosity and the beam lifetime will decrease under a certain beam current.Methods For filter design of the feedback system,the time domain least square fitting(TDLSF)method is compared to the selective wave filter method;digital signal processing electronics based on commercial board have been developed and tested on BEPCII.Results The final result shows that the self-developed longitudinal feedback system can suppress the longitudinal beam oscillation at 750 mA beam current and meet the requirements of BEPCII;the restrain depth to the sidebands reaches to 40.8 dB.

关 键 词：Longitudinal bunch instability BEPCII Feedback system 

分 类 号：O57[理学—粒子物理与原子核物理]