Physical design of low-emittance L-band photocathode microwave electron gun

Chenglong LI; Zhenxing TANG; Yuanji PEI

doi:10.11889/j.0253-3219.2016.hjs.39.090203

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Physical design of low-emittance L-band photocathode microwave electron gun

LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS | 更新时间：2021-05-24

- Physical design of low-emittance L-band photocathode microwave electron gun
- NUCLEAR TECHNIQUES Vol. 39, Issue 9, Article number: 090203(2016)
- 作者机构：
  
  中国科学技术大学国家同步辐射实验室合肥 230022
- 作者简介：
- 基金信息：
  
  Supported by National High Technology Research and Development Program 863
- DOI：10.11889/j.0253-3219.2016.hjs.39.090203
  CLC： TL503.5
- Received：05 April 2016，
  
  Revised：17 May 2016，
  
  Published：2016-09
- 稿件说明：
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Chenglong LI, Zhenxing TANG, Yuanji PEI. Physical design of low-emittance L-band photocathode microwave electron gun[J]. Nuclear techniques, 2016, 39(9): 090203
DOI：

Chenglong LI, Zhenxing TANG, Yuanji PEI. Physical design of low-emittance L-band photocathode microwave electron gun[J]. Nuclear techniques, 2016, 39(9): 090203 DOI： 10.11889/j.0253-3219.2016.hjs.39.090203.

摘要

太赫兹（THz）光源对电子束的能量、能散及发射度有极高要求，研发高性能电子源是基于自由电子激光（Free Electron Laser

FEL）的THz光源的重要挑战。对电子腔中束团发射度增长机制的研究，有助于设计针对有效的发射度补偿方案。本文首先描述了L波段光阴极微波电子枪腔的设计，利用POISSON Superfish软件给出了腔内电磁场分布，详细分析了束流发射度增长的因素，讨论发射度补偿原理。由此提出基于主副螺线管线圈抑制发射度增长的补偿方案，并用ASTRA程序对补偿效果进行模拟计算。结果表明，采用该补偿方案后，电子腔输出束团的能散和发射度有显著改善，达到THz光源对于电子源的要求。

Abstract

Background:

The development of high performance electron beam source has been a challenge for Free-electron Laser(FEL)based THz source which is critical for the energy

energy spread and emittance of the electron beam.

Purpose:

This work aims to find out the mechanism of emittance growth and developing a compensation technique for this emittance growth in the Radio Frequency(RF)gun cavity.

Methods:

First of all

a RF gun cavity is designed using POISSON Superfish to calculate its electro-magnetic field distribution for analysis of the emittance growth mechanism.Then

a compensation scheme is developed by employing a pair of solenoids to reduce the space charge emittance.Finally

the effectiveness of scheme is evaluated using the commonly used reliable simulation program ASTRA.

Results:

The simulation results show that the normalized transverse emittance of a 5.67-MeV electron bunch with 200 pC is reduced to 0.373 mm·mrad while the energy spread is reduced to 2.3‰.For a 5.67-MeV electron bunch with 1000 pC

the emittance and energy spread are reduced to 0.934 mm·mrad and 7.6‰

respectively.

Conclusion:

Simulation of the final design shows that the performance of the electron beam produced by the RF gun has achieved the requirements for THz source.

关键词

Keywords

references

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