高亮度电子束相空间重建技术的实验研究

于清林; 张猛; 谷端; 赵明华

doi:10.11889/j.0253-3219.2018.hjs.41.030103

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高亮度电子束相空间重建技术的实验研究

同步辐射技术及应用 | 更新时间：2021-05-19

- 高亮度电子束相空间重建技术的实验研究
- Experimental study on phase space reconstruction of high-brightness electron beam
- 核技术 2018年41卷第3期文章编号：030103
- 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：
  
  [ "于清林, 男, 1987年出生, 2011年毕业于青岛大学, 现为博士研究生, 研究领域为加速器束流诊", "YU Qinglin, male, born in 1987, graduated from Qingdao University in 2011, doctoral student, focusing on acceleration beam diagnostic" ]
  赵明华, E-mail:zhaominghua@sinap.ac.cn ZHAO Minghua, E-mail:zhaominghua@sinap.ac.cn
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.030103
  中图分类号： TL271
- 收稿日期：2017-09-27，
  
  修回日期：2017-10-12，
  
  纸质出版日期：2018-03-10
- 稿件说明：
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于清林, 张猛, 谷端, 等. 高亮度电子束相空间重建技术的实验研究[J]. 核技术, 2018,41(3):030103

Qinglin YU, Meng ZHANG, Duan GU, et al. Experimental study on phase space reconstruction of high-brightness electron beam[J]. Nuclear techniques, 2018, 41(3): 030103
于清林, 张猛, 谷端, 等. 高亮度电子束相空间重建技术的实验研究[J]. 核技术, 2018,41(3):030103 DOI： 10.11889/j.0253-3219.2018.hjs.41.030103.

Qinglin YU, Meng ZHANG, Duan GU, et al. Experimental study on phase space reconstruction of high-brightness electron beam[J]. Nuclear techniques, 2018, 41(3): 030103 DOI： 10.11889/j.0253-3219.2018.hjs.41.030103.

摘要

束团相空间是描述加速器中束流运行状态的重要参数，了解相空间的真实分布对于加速器设计、束团操纵具有非常重要的意义，利用相空间重建技术能够直观地得到束团二维相空间分布。本文结合计算机断层扫描技术（Computer Tomography，CT）与归一化相空间理论，在理论推导和模拟验证的基础上，分别利用MENT（Maximum Entropy）算法和FBP（Filtered Back Projection）算法在上海X射线自由电子激光装置（Shanghai Soft X-ray Free Electron Laser facility，SXFEL）专用束测段（BI1）对电子束团的横向归一化相空间进行重建。通过重建算法变换得到电子束团的真实相空间分布，并对重建结果进行对比和误差分析。实验结果表明，MENT算法能够精确测量电子束团横向相空间分布。

Abstract

Background

Phase space is an important parameter to describe the beam transmission

and it is of great importance to measure the phase space distribution experimentally in linear accelerator (LINAC) commissioning. Computer tomography technology has been used in many accelerators to characterize the phase space of an electron beam in recent years.

Purpose

This study aims to measure two-dimensional distribution of phase space by reconstruction technology for high-brightness electron beam.

Methods

Maximum entropy (MENT) algorithm and filtered back projection (FBP) algorithm were combined with computer tomography technology and normalized phase space theory to reconstruct the normalized phase space of the beam. Then transformed the normalized phase space to real phase space with experimental verification at special beam insertion (BI1) of Shanghai Soft X-ray Free Electron Laser facility (SXFEL).

Results

The results from FBP algorithm and MENT algorithm were compared

and the latter showed better performance than the former. The emittance and Twiss parameters calculated by reconstructed phase space were very close to the values obtained by quadrupole scan method.

Conclusion

The experimental results show that computer tomography technology with MENT algorithm can reconstruct the beam phase space exactly.

关键词

Keywords

references

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