Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm

Ze-Yi Dai; Yuan-Cun Nie; Zi Hui; Lan-Xin Liu; Zi-Shuo Liu; Jian-Hua Zhong; Jia-Bao Guan; Ji-Ke Wang; Yuan Chen; Ye Zou; Hao-Hu Li; Jian-Hua He

doi:10.1007/s41365-023-01183-6

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Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | Updated：2023-04-20

- Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm
- Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm
- 核技术（英文版） 2023年34卷第3期文章编号：41
- Affiliations：
  
  1.The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
- Author bio：
  
  * nieyuancun@whu.edu.cn
  ** hejianhua@whu.edu.cn
- Funds：
  
  Science and Technology Major Project of Hubei Province, China(2021 AFB001)
- DOI：10.1007/s41365-023-01183-6
  中图分类号：
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Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm[J]. 核技术（英文版）, 2023,34(3):41

Ze-Yi Dai, Yuan-Cun Nie, Zi Hui, et al. Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm[J]. Nuclear Science and Techniques, 2023,34(3):41
Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm[J]. 核技术（英文版）, 2023,34(3):41 DOI： 10.1007/s41365-023-01183-6.

Ze-Yi Dai, Yuan-Cun Nie, Zi Hui, et al. Design of S-band photoinjector with high bunch charge and low emittance based on multi-objective genetic algorithm[J]. Nuclear Science and Techniques, 2023,34(3):41 DOI： 10.1007/s41365-023-01183-6.

摘要

Abstract

High-brightness electron beams are required to drive LINAC-based free-electron lasers (FELs) and storage-ring-based synchrotron radiation light sources. The bunch charge and RMS bunch length at the exit of the LINAC play a crucial role in the peak current; the minimum transverse emittance is mainly determined by the injector of the LINAC. Thus, a photoinjector with a high bunch charge and low emittance that can simultaneously provide high-quality beams for 4,th, generation synchrotron radiation sources and FELs is desirable. The design of a 1.6-cell S-band 2998-MHz RF gun and beam dynamics optimization of a relevant beamline are presented in this paper. Beam dynamics simulations were performed by combining ASTRA and the multi-objective genetic algorithm NSGA II. The effects of the laser pulse shape, half-cell length of the RF gun, and RF parameters on the output beam quality were analyzed and compared. The normalized transverse emittance was optimized to be as low as 0.65 mm·mrad and 0.92 mm·mrad when the bunch charge was as high as 1 nC and 2 nC, respectively. Finally, the beam stability properties of the photoinjector, considering misalignment and RF jitter, were simulated and analyzed.

关键词

Keywords

Electron linear acceleratorPhotoinjectorBeam dynamicsMulti-objective genetic algorithm

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