The design, manufacture and vertical testing of 648 MHz 6-cell elliptical cavity for CSNS-II

In order to increase the operating power of beam, China Spallation Neutron Source phase II (CSNS-II) will use two families of superconducting cavities (double-spoke cavity and elliptical cavity) to increase the energy of H − from 80 MeV in the phase I to 300 MeV. In January 2024, the project team successfully completed the prototype verification of the double-spoke superconducting cavity cryomodule. The maximum acceleration gradient of the double-spoke resonator (DSR) reached 15.2 MV/m, significantly surpassing the design target of 9 MV/m. The development of the elliptical cavity prototype began in March 2021. At present, the elliptical cavities have completed the prototype design, manufacturing, post-processing, and vertical testing, achieving a maximum gradient of 25.7 MV/m and a Q exceeding 1 × 10 10 , far surpassing the engineering requirement of 14 MV/m and the Q exceeds 5 × 10 9 . This paper details the design, fabrication, post-processing, and vertical testing of β = 0.62 elliptical cavities, covering challenges and solutions.

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Publication Details

Journal
Superconductivity
Published
2026-07-01
DOI
https://doi.org/10.1016/j.supcon.2026.100273
Primary Topic
Particle accelerators and beam dynamics
Type
article
Field-Weighted Citation Impact
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article

The design, manufacture and vertical testing of 648 MHz 6-cell elliptical cavity for CSNS-II

Hongyun Zhao, Ahong Li, Feisi He, Q Chen et al.
Superconductivity
Particle accelerators and beam dynamics
article

The design, manufacture and vertical testing of 648 MHz 6-cell elliptical cavity for CSNS-II

Hongyun Zhao, Ahong Li, Feisi He, Q Chen, Peihua Qu, Baiqi Liu, T Wang, Miaofu Xu, Bo Li, Yi Chen, Jin Zhou, Zhexin Xie, Zhenqiang He, Huachang Liu, Tongxian Zhao, C L Dong, Mengxu Fan, Zhengze Chang, Mei Li, Cong Zhang, Weimin Pan, Wenzhong Zhou, Sheng Wang, Qiyu Kong, Zhenghui Mi, Liangrui Sun, Jin Dai, Xiaolong Wang, Rui Ge, Xu Chen, Ming Liu, Xiaolei Wu, Song Jin, Jun Peng
article en

Abstract

In order to increase the operating power of beam, China Spallation Neutron Source phase II (CSNS-II) will use two families of superconducting cavities (double-spoke cavity and elliptical cavity) to increase the energy of H − from 80 MeV in the phase I to 300 MeV. In January 2024, the project team successfully completed the prototype verification of the double-spoke superconducting cavity cryomodule. The maximum acceleration gradient of the double-spoke resonator (DSR) reached 15.2 MV/m, significantly surpassing the design target of 9 MV/m. The development of the elliptical cavity prototype began in March 2021. At present, the elliptical cavities have completed the prototype design, manufacturing, post-processing, and vertical testing, achieving a maximum gradient of 25.7 MV/m and a Q exceeding 1 × 10 10 , far surpassing the engineering requirement of 14 MV/m and the Q exceeds 5 × 10 9 . This paper details the design, fabrication, post-processing, and vertical testing of β = 0.62 elliptical cavities, covering challenges and solutions.

Superconductivity
Chinese Academy of Sciences (CN), China Spallation Neutron Source (CN), Institute of High Energy Physics (CN), University of Chinese Academy of Sciences (CN)
Affordable and clean energy
Openalex Percentile: Top 4%
Particle accelerators and beam dynamics
DOIOpen Access PDFOpenAlex
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