Development of fiber beam loss monitor based on Cerenkov principle

LIU Chang; LENG Yongbin; YU Luyang; ZHOU Weimin

doi:10.11889/j.0253-3219.2013.hjs.36.080102

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Development of fiber beam loss monitor based on Cerenkov principle

更新时间：2021-03-05

- Development of fiber beam loss monitor based on Cerenkov principle
- NUCLEAR TECHNIQUES Vol. 36, Issue 8, Article number: 080102(2013)
- 作者机构：
  
  1. 中国科学院上海应用物理研究所
  2. 中国科学院大学
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2013.hjs.36.080102
  CLC： TL506
- Published：01 August 2013
- 稿件说明：
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[1]刘畅,冷用斌,俞路阳,周伟民.基于切伦科夫原理的光纤束损探测系统研制[J].核技术,2013,36(08):10-16.

LIU Chang, LENG Yongbin, YU Luyang, et al. Development of fiber beam loss monitor based on Cerenkov principle[J]. Nuclear techniques, 2013, 36(8): 080102
[1]刘畅,冷用斌,俞路阳,周伟民.基于切伦科夫原理的光纤束损探测系统研制[J].核技术,2013,36(08):10-16. DOI： 10.11889/j.0253-3219.2013.hjs.36.080102.

LIU Chang, LENG Yongbin, YU Luyang, et al. Development of fiber beam loss monitor based on Cerenkov principle[J]. Nuclear techniques, 2013, 36(8): 080102 DOI： 10.11889/j.0253-3219.2013.hjs.36.080102.

摘要

同步辐射光源及自由电子激光装置需要一种新型的束流损失探测系统

用于实时监测小间隙插入件处的束流损失。为此研制了采用光纤作为探测器的束流损失监测系统

系统包含长30 m的阶跃光纤、光电倍增管、8 GS/s高速采集板卡（10 bits）及配套作为输入输出控制器的PXI总线工控机。数据采集处理软件在Linux系统下基于EPICS框架开发。为使系统能在多束团填充的储存环上应用

设计了一种双端测量方案及数据处理方法。初步束流实验结果表明

该系统可在低至1 mA条件下监测到束损信号

光脉冲计数率可用于表征束流损失剂量

储存环220 mA恒流供光模式下本底噪声约占总计数率的3.56%。

Abstract

Background: A new type of beam loss monitor（BLM） system is needed in the synchrotron radiation light source or FEL facility to monitor the real-time beam loss inside the small-gap insertion devices.Purpose: A BLM system was developed with optical fiber as the probe to meet the requirements of SSRF.Methods: The whole system consists of a 30-m long step-index fiber

photomultiplier tubes（PMT）

a 10-bit 8-GS/s high-speed waveform digitizer and a PXI input-output controller.The software was developed under the Linux system based on Experimental Physics and Industrial Control System（EPICS）.A new measurement and corresponding calculation method were designed to make the system work well with the multi-bunch operation mode in the storage ring of SSRF.Results: The BLM system worked well at SSRF.And the results of beam experiments showed that the system could detect beam loss properly even at the 1-mA low current case.Conclusions: This system could be used in the detection of beam loss dose and position.In the experiments the counts of light pulses can be used as a rough estimation of beam loss dose.The noise floor is about 3.56% of the total count in the 220-mA top-up user operation mode.

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