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High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule

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arxiv 2312.01175 v1 pith:ABP6ONUQ submitted 2023-12-02 physics.acc-ph

Jiyuan Zhai , Weimin Pan , Feisi He , Rui Ge , Zhenghui Mi , Peng Sha , Song Jin , Ruixiong Han
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Qunyao Wang Haiying Lin Guangwei Wang Mei Li Minjing Sang Liangrui Sun Rui Ye Tongxian Zhao Shaopeng Li Keyu Zhu Baiqi Liu Xiaolong Wang Xiangchen Yang Xiaojuan Bian Xiangzhen Zhang Huizhou Ma Xuwen Dai Zhanjun Zhang Liang Zhang Hui Zhao Runbing Guo Zhihui Mu Conglai Yang Xiaobing Zheng Chao Dong Tongming Huang Qiang Ma Hongjuan Zheng Ming Liu Zihan Wang Wenzhong Zhou
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classification physics.acc-ph
keywords cryomodulehighaveragebakebakingcavitiescavitycell
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World's first 1.3 GHz cryomodule containing eight 9-cell superconducting radio-frequency (RF) cavities treated by medium-temperature furnace baking (mid-T bake) was developed, assembled and tested at IHEP for the Dalian Advanced Light Source (DALS) and CEPC R&D. The 9-cell cavities in the cryomodule achieved an unprecedented highest average Q0 of 3.8E10 at 16 MV/m and 3.6E10 at 21 MV/m in the horizontal test. The cryomodule can operate stably up to a total CW RF voltage greater than 191 MV, with an average cavity CW accelerating gradient of more than 23 MV/m. The results significantly exceed the specifications of CEPC, DALS and the other high repetition rate free electron laser facilities (LCLS-II, LCLS-II-HE, SHINE, S3FEL). There is evidence that the mid-T bake cavity may not require fast cool-down or long processing time in the cryomodule. This paper reviews the cryomodule performance and discusses some important issues in cryomodule assembly and testing.

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