Measurement study of electron bunch length based on the coherent transition radiation

Yu BIAN; Wenyan ZHANG; Bo LIU; Dong WANG

doi:10.11889/j.0253-3219.2017.hjs.40.010102

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Measurement study of electron bunch length based on the coherent transition radiation

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-19

- Measurement study of electron bunch length based on the coherent transition radiation
- NUCLEAR TECHNIQUES Vol. 40, Issue 1, Article number: 010102(2017)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2017.hjs.40.010102
  CLC： TL53
- Received：17 October 2016，
  
  Revised：25 November 2016，
  
  Published：2017-01
- 稿件说明：
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Yu BIAN, Wenyan ZHANG, Bo LIU, et al. Measurement study of electron bunch length based on the coherent transition radiation[J]. Nuclear techniques, 2017, 40(1): 010102
DOI：

Yu BIAN, Wenyan ZHANG, Bo LIU, et al. Measurement study of electron bunch length based on the coherent transition radiation[J]. Nuclear techniques, 2017, 40(1): 010102 DOI： 10.11889/j.0253-3219.2017.hjs.40.010102.

摘要

电子束团长度是束流诊断中的重要参数，基于相干渡越辐射（Coherent Transition Radiation，CTR）的测量方法是一种简单易行的高时间分辨率测量方法。本文调研并分析了不同电子束团长度测量方法的优缺点，选择基于CTR方法作为主要研究方向，主要针对上海深紫外自由电子激光实验装置（Shanghai Deep Ultra-Violet Free Electron Laser，SDUV-FEL）和X射线自由电子激光试验装置（Shanghai X-ray Free Electron Laser，SXFEL）进行了实验方案设计和模拟分析。结果表明，通过合理的参数选择和方案优化，用该方法可对飞秒至皮秒范围内的束团长度进行测量，时间分辨率能到达飞秒量级，满足SDUV-FEL的实验需求和SXFEL的工程需求。

Abstract

Background:

Longitudinal electron bunch length is an important parameter in accelerator beam diagnostics. It plays a significant role in single-pass free electron lasers

since the high-gain Free Electron Laser (FEL) process depends strongly on a high peak current of the electron bunches.

Purpose:

It is necessary to measure the electron bunch lengths in both Shanghai Deep Ultra-Violet Free Electron Laser (SDUV-FEL) and Shanghai X-ray Free Electron Laser (SXFEL).

Methods:

In this paper

the advantages and disadvantages of three standard diagnostic tools for bunch length measurement are compared and a measuring system based on coherent transition radiatio

(CTR) for SDUV-FEL and SXFEL is designed and analyzed.

Results:

The simulation shows that the measuring system can measure the electron bunch length from 20 fs to 1 ps effectively and time resolution of the measuring system can reach 20 fs.

Conclusion:

Electron bunch length measurement by means of CTR is an easy way to achieve high time resolution with inexpensive experimental instruments. The measuring system meets the demands of SDUV-FEL and SXFEL well.

关键词

Keywords

references

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