Study on FIR filter of the accelerator bunch-by-bunch digital feedback system

Penghui LYU; Di YIN; Junhui YUE; Jianshe CAO; Shujun WEI; Qinghong LAN; Yaoyao DU; Fang LIU; Yanhua LU

doi:10.11889/j.0253-3219.2018.hjs.41.110203

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Study on FIR filter of the accelerator bunch-by-bunch digital feedback system

LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS | 更新时间：2021-05-19

- Study on FIR filter of the accelerator bunch-by-bunch digital feedback system
- NUCLEAR TECHNIQUES Vol. 41, Issue 11, Article number: 110203(2018)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.110203
  CLC： TL506
- Received：21 November 2017，
  
  Revised：19 May 2018，
  
  Published：10 November 2018
- 稿件说明：
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Penghui LYU, Di YIN, Junhui YUE, et al. Study on FIR filter of the accelerator bunch-by-bunch digital feedback system[J]. Nuclear techniques, 2018, 41(11): 110203
DOI：

Penghui LYU, Di YIN, Junhui YUE, et al. Study on FIR filter of the accelerator bunch-by-bunch digital feedback system[J]. Nuclear techniques, 2018, 41(11): 110203 DOI： 10.11889/j.0253-3219.2018.hjs.41.110203.

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。

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.

关键词

Keywords

references

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