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Conceptual study and design of A C-band photocathode injector

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Abstract

Purpose

A C-band photocathode injector composed of a 3.6-cell C-band photocathode RF gun and two 1.8-m C-band accelerating structures is proposed. The injector is a low emittance electron source for free electron lasers (FEL) and other compact light sources.

Methods

The RF structure of the cavities is designed with 2D SUPERFISH simulation. The beam dynamic study in ASTRA helps rectify the 2D RF simulation. To feed the cavities, a design of extracoaxial coupler with RF gun structure is presented.

Results

With compact focusing solenoids, for 0.25 nC bunch charge, the final energy can reach 6.9 MeV energy and the 95% emittance can be as low as 0.23 mm mrad (95%).

Conclusion

All the details of RF design and beam dynamics studies are presented in this paper, and the design satisfied the requirements of FEL and other applications.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (No. 11675249).

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Authors and Affiliations

  1. Shanghai Synchrotron Radiation Facility (SSRF), Chinese Academy of Sciences, Shanghai, 201800, China

    Wencheng Fang & Zhentang Zhao

  2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Lin Wang

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Lin Wang

Authors
  1. Wencheng Fang
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  2. Lin Wang
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  3. Zhentang Zhao
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Corresponding authors

Correspondence to Lin Wang or Zhentang Zhao.

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Fang, W., Wang, L. & Zhao, Z. Conceptual study and design of A C-band photocathode injector. Radiat Detect Technol Methods 3, 39 (2019). https://doi.org/10.1007/s41605-019-0117-z

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  • DOI: https://doi.org/10.1007/s41605-019-0117-z

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