High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source

Jian-Xin Wang; Kui Zhou; Peng Li; De-Xin Xiao; Li-Jun Shan; Xu-Ming Shen; Yu Liu; Zheng Zhou; Han-Bin Wang; Dai Wu

doi:10.1007/s41365-022-01025-x

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High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2022-12-16

- High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source
- Nuclear Science and Techniques Vol. 33, Issue 4, Article number: 44(2022)
- Affiliations：
  
  1.Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China
- Author bio：
  
  z-zhou14@tsinghua.org.cn
- Funds：
- DOI：10.1007/s41365-022-01025-x
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Jian-Xin Wang, Kui Zhou, Peng Li, et al. High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source. [J]. Nuclear Science and Techniques 33(4):44(2022)
DOI：

Jian-Xin Wang, Kui Zhou, Peng Li, et al. High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source. [J]. Nuclear Science and Techniques 33(4):44(2022) DOI： 10.1007/s41365-022-01025-x.

摘要

Abstract

We report our recent progress in the design and simulation of a high-brightness S-band photo-injector with a ballistic bunching scheme aimed at driving an inverse Compton scattering (ICS) X-ray source. By adding a short standing-wave buncher between the RF gun and first booster in a conventional S-band photo-injector, electron bunches with a 500 pC charge can be compressed to the sub-picosecond level with very limited input RF power and an unchanged basic layout of the photo-injector. Beam dynamics analysis indicates that fine tuning of the focusing strength of the gun and linac solenoid can well balance additional focusing provided by the standing wave buncher and generate a well-compensated transverse emittance. Thorough bunching dynamics simulations with different operating conditions of the buncher show that a buncher with more cells and a moderate gradient is suitable for simultaneously obtaining a short bunch duration and low emittance. In a typical case of a 9-cell buncher with a 38 MV/m gradient, an ultrashort bunch duration of 0.5 ps (corresponding to a compression ratio of > 5) and a low emittance of < 1 mm·mrad can be readily obtained for a 500 pC electron pulse. This feasible ballistic bunching scheme will facilitate the implementation of an ultrashort pulse mode inverse Compton scattering X-ray source on most existing S-band photo-injectors.

关键词

Keywords

Beam brightnessBallistic bunchingEmittance compensationCompton scattering X-ray source

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