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RF design of a compact 648 MHz single spoke cavity at CSNS

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Abstract

Purpose

In order to increase CSNS beam power from 100 to 500 kW, the linac injection energy needs to be increased from 80 to 300 MeV. The combined layout of superconducting spoke cavities and elliptical cavities will be adopted to accelerate H− beam to 300 MeV. In this paper, a compact single spoke cavity with Φ50-mm beam aperture was proposed, with the RF performance of the spoke cavity optimized to Ep/Eacc < 5, Bp/Eacc < 9, as well as the good multipacting behavior.

Methods

CST Microwave Studio was used to optimize the RF performance (Epeak/Eacc, Bpeak/Eacc, R/Q) with cavity geometry parameters. After electromagnetic design was finished, multipacting behavior was studied with CST Particle Studio module, and cavity shape modification was made to get a reasonable <SEY> value.

Results

The simulation got optimum results of Epeak/Eacc = 4.97 and Bpeak/Eacc = 8.42 mT/(MV/m), and the <SEY> max is 1.52 at Eacc = 7.74 MV/m.

Conclusion

A 648 MHz βg = 0.4 single spoke cavity with beam aperture Φ50 mm was proposed in the paper. This compact cavity may be a very promising option for CSNS linac upgrading. In addition to the optimization of the RF parameters, the multipacting behavior of the cavity is also studied, and cavity shape is optimized to reduce <SEY> value.

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Funding

Funding was provided by Spallation Neutron Source Science Center.

Author information

Authors and Affiliations

  1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Yun Wang, Huachang Liu, Jianping Dai, Peng Sha, Ziwei Deng, Bo Li, Mengxu Fan, Ahong Li, Peihua Qu, Xiaolei Wu & Qiang Chen

  2. Spallation Neutron Source Science Center, Dongguan, 523803, China

    Yun Wang, Huachang Liu, Bo Li, Mengxu Fan, Ahong Li, Peihua Qu, Xiaolei Wu & Qiang Chen

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

    Yun Wang, Huachang Liu & Ziwei Deng

Authors
  1. Yun Wang
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  2. Huachang Liu
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  3. Jianping Dai
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  4. Peng Sha
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  5. Ziwei Deng
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  6. Bo Li
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  7. Mengxu Fan
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  8. Ahong Li
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  9. Peihua Qu
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  10. Xiaolei Wu
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  11. Qiang Chen
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Corresponding author

Correspondence to Yun Wang.

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Cite this article

Wang, Y., Liu, H., Dai, J. et al. RF design of a compact 648 MHz single spoke cavity at CSNS. Radiat Detect Technol Methods 3, 56 (2019). https://doi.org/10.1007/s41605-019-0135-x

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  • DOI: https://doi.org/10.1007/s41605-019-0135-x

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