Design and simulation of bunch length measurement with electro-optical spectral decoding at SDUV-FEL

Lianfa HUA; Wenyan ZHANG; Xingtao WANG; Zhen LI; Bo LIU

doi:10.11889/j.0253-3219.2016.hjs.39.040102

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Design and simulation of bunch length measurement with electro-optical spectral decoding at SDUV-FEL

更新时间：2021-05-25

- Design and simulation of bunch length measurement with electro-optical spectral decoding at SDUV-FEL
- NUCLEAR TECHNIQUES Vol. 39, Issue 4, Article number: 040102(2016)
- 作者机构：
  
  1.上海大学环境与化学工程学院上海 200444;
  2.中国科学院上海应用物理研究所嘉定园区上海 201800
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.040102
  CLC： TL506
- Received：20 January 2016，
  
  Accepted：2016-03-08，
  
  Published：25 January 2016
- 稿件说明：
移动端阅览
Lianfa HUA, Wenyan ZHANG, Xingtao WANG, et al. Design and simulation of bunch length measurement with electro-optical spectral decoding at SDUV-FEL[J]. Nuclear techniques, 2016, 39(4): 040102
DOI：

Lianfa HUA, Wenyan ZHANG, Xingtao WANG, et al. Design and simulation of bunch length measurement with electro-optical spectral decoding at SDUV-FEL[J]. Nuclear techniques, 2016, 39(4): 040102 DOI： 10.11889/j.0253-3219.2016.hjs.39.040102.

摘要

电子束团纵向长度是束流诊断中的重要参数

电光频谱解码法(Electro-Optical Spectral Decoding

EOSD)是为数不多的可进行单发测量的高时间分辨率测量方法。本文基于上海深紫外自由电子激光装置(Shanghai Deep Ultraviolet Free Electron Laser

SDUV-FEL)设计了一套电光频谱解码法测量束团长度实验方案。通过采用针尖粗同步和可调的光栅展宽器可实现长度在1-10 ps内变化的束团无损测量。通过对电光调制过程及其后探测的仿真研究表明

选用0.5 mm厚的ZnTe晶体在距离束流中心3-5 mm处测量时

时间分辨率最高可达180fs(Root Mean Square

RMS)

信号展宽在3%以内

测量的电场形状无可观测畸变

满足SDUV-FEL的实验需求。

Abstract

Background:

The longitudinal length of electron bunch is an important parameter in beam diagnostics. Electro-Optical Spectral Decoding(EOSD) is one of the few powerful approaches to accurately measure bunches down to sub-picosecond level.

Purpose:

This study aims to design and evaluate a complete system to measure the bunch length at Shanghai Deep Ultraviolet Free Electron Laser(SDUV-FEL).

Methods:

The EOSD with a probe used for coarse synchronization and a tunable grating pair used as laser stretcher was designed

and the processes of Electro-Optical modulation and detection were simulated in detail.

Results:

The bunch length varying from 1 ps to 10ps can be measured without beam destruction in the whole process. The time resolution(Root Mean Square

RMS) is expected up to 180 fs at best and signal broadening within 3%.

Conclusion:

The longitudinal bunch length can be measured with high quality utilizing our EOSD setup. The system can meet the demands of SDUV-FEL.

关键词

Keywords

references

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