Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Characterization and Correction of Multipole Field Effect on Electron Beams from a High-Brightness Continuous-Wave Photocathode Gun

Haoyan Jia
,
Tianyi Li
,
Juntao Liu
,
Zhongqi Liu
,
Xiang Zhang
ORCID logo ,
Jingyi Li
ORCID logo ,
Kexin Liu
,
Cheng-Ying Tsai
ORCID logo ,
Hang Xu
ORCID logo ,
Senlin Huang
* ORCID logo
Version 1 : Received: 29 August 2024 / Approved: 30 August 2024 / Online: 1 September 2024 (16:54:14 CEST)

How to cite: Jia, H.; Li, T.; Liu, J.; Liu, Z.; Zhang, X.; Li, J.; Liu, K.; Tsai, C.-Y.; Xu, H.; Huang, S. Characterization and Correction of Multipole Field Effect on Electron Beams from a High-Brightness Continuous-Wave Photocathode Gun. Preprints 2024, 2024082248. https://doi.org/10.20944/preprints202408.2248.v1 Jia, H.; Li, T.; Liu, J.; Liu, Z.; Zhang, X.; Li, J.; Liu, K.; Tsai, C.-Y.; Xu, H.; Huang, S. Characterization and Correction of Multipole Field Effect on Electron Beams from a High-Brightness Continuous-Wave Photocathode Gun. Preprints 2024, 2024082248. https://doi.org/10.20944/preprints202408.2248.v1

Abstract

Continuous-wave photocathode guns are capable of delivering electron beams with high repetition rates and high average currents. However, they are limited by relatively low accelerating gradients and cathode fields. This limitation leads to a larger beam size at the gun exit due to space charge forces, making the beam more sensitive to optical aberrations and posing challenges for low-emittance electron beam transmission. This paper focuses on the aberrations induced by multipole fields. We analyze the effects of quadrupole, sextupole, and higher-order fields on beam profile and transverse emittance and propose a beam-based method for the rapid characterization and correction of these multipole fields. Furthermore, we present an experimental study conducted on the DC-SRF-II photocathode gun equipped with dedicated correctors. Both simulation and experimental results demonstrate that our approach effectively mitigates beam aberrations caused by multipole fields, resulting in improved beam symmetry and reduced emittance.

Keywords

multipole field; beam aberration; characterization and correction; DC-SRF-II; continuous-wave photocathode gun

Subject

Physical Sciences, Nuclear and High Energy Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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