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

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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 \(< {1}\,{\hbox {mm}\cdot \hbox {mrad}}\) 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.

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Authors and Affiliations

  1. Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, 621900, China

    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

Authors
  1. Jian-Xin Wang
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  2. Kui Zhou
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  3. Peng Li
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  4. De-Xin Xiao
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  5. Li-Jun Shan
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  6. Xu-Ming Shen
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  7. Yu Liu
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  8. Zheng Zhou
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  9. Han-Bin Wang
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  10. Dai Wu
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Corresponding author

Correspondence to Zheng Zhou.

Additional information

This work was supported by National Natural Science Foundation of China (NSFC) (Nos. 12005211, 11905210, 11975218 and 11805192).

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Wang, JX., Zhou, K., Li, P. et al. High-brightness photo-injector with standing-wave buncher-based ballistic bunching scheme for inverse Compton scattering light source. NUCL SCI TECH 33, 44 (2022). https://doi.org/10.1007/s41365-022-01025-x

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  • DOI: https://doi.org/10.1007/s41365-022-01025-x

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