第41卷 第11期 核 技 术 V ol.41, No.11 2018年11月 NUCLEAR TECHNIQUES November 2018
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第一作者：吕朋辉，男，1989年出生，2017年于中国科学院大学获硕士学位，主要从事于加速器束流测量技术研究
通信作者：岳军会，E-mail: yuejh@https://www.doczj.com/doc/ee15645522.html,
收稿日期：2017-11-21，修回日期：2018-05-19
First author: LYU Penghui, male, born in 1989, graduated from University of Chinese Academy of Sciences with a master’s degree in 2017, focusing on
accelerator beam measurement technology research
Corresponding author: YUE Junhui, E-mail: yuejh@https://www.doczj.com/doc/ee15645522.html,
Received date: 2017-11-21, revised date: 2018-05-19 110203-1
加速器逐束团数字反馈系统FIR 滤波器研究
吕朋辉1 尹 頔1 岳军会1 曹建社1 魏书军1
蓝清宏1,2 杜垚垚1 刘 芳1 卢艳华1
1（中国科学院高能物理研究所 北京 100049）
2（中国科学院大学 北京 100049）
摘要 为了克服加速器中束流耦合束团不稳定性，新建的储存环必须采用逐束团数字反馈系统。数字反馈系
统采用有限长单位冲激响应滤波器(Finite Impulse Response, FIR)来实现对束流信号滤波和90°移相，最终得到
反馈信号。FIR 滤波器可采用最小二乘法和选择滤波器法设计，本文在横向或纵向反馈系统中深入研究了这两
种方法的差异。分析结果表明：采用选择滤波器法，设计简单，是较佳设计方法。随后，对选择滤波器法进
行了优化，进一步分析了采用优化的选择滤波器法设计的FIR 滤波器的工作可靠性以及滤波效果，对反馈系
统FIR 滤波器设计有一定的指导作用。
关键词 横向反馈系统，纵向反馈系统，最小二乘法，选择滤波器法，FIR 滤波器
中图分类号 TL506
DOI: 10.11889/j.0253-3219.2018.hjs.41.110203
Study on FIR filter of the accelerator bunch-by-bunch digital feedback system
LYU Penghui 1 YIN Di 1 YUE Junhui 1 CAO Jianshe 1 WEI Shujun 1 LAN Qinghong 1,2
DU Yaoyao 1 LIU
Fang 1 LU Yanhua 1 1(Institute of High Energy Physics , Chinese Academy of Sciences , Beijing 100049, China )
2(University of Chinese Academy of Sciences , Beijing 100049, China )
Abstract [Background ] When the beam goes through the high-frequency cavity and the vacuum chamber of the
accelerator, the coupled-bunch instability caused by the high-order mode and the resistive wall will limit the threshold
of the beam. [Purpose ] This study aims to control the coupled-bunch instability by design of a longitudinal or
transverse feedback system. [Methods ] The accelerator digital feedback system was designed to filter the beam signal
and make a 90° phase shift by using the finite impulse response (FIR) filter to finally obtain the feedback signal. The
FIR filter can be designed by using the least square fitting method and the selective FIR filter method. The difference
between the two methods was studied in the transverse and the longitudinal feedback system. After optimized the
selective filter method, the operational reliability and filtering effect of the FIR filter designed by using the selective
filter method are analyzed deeply. [Results ] The results show that the selective filter method is more simple and better.
[Conclusions ] Proposed method can be referenced for designing FIR filter of the feedback system.
Key words Transverse feedback, Longitudinal feedback, Finite impulse response filter, The least square fitting
method, Selective FIR filter method
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