1. High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule
- Author
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Zhai, Jiyuan, Pan, Weimin, He, Feisi, Ge, Rui, Mi, Zhenghui, Sha, Peng, Jin, Song, Han, Ruixiong, Wang, Qunyao, Lin, Haiying, Wang, Guangwei, Li, Mei, Sang, Minjing, Sun, Liangrui, Ye, Rui, Zhao, Tongxian, Li, Shaopeng, Zhu, Keyu, Liu, Baiqi, Wang, Xiaolong, Yang, Xiangchen, Bian, Xiaojuan, Zhang, Xiangzhen, Ma, Huizhou, Dai, Xuwen, Zhang, Zhanjun, Zhang, Liang, Zhao, Hui, Guo, Runbing, Mu, Zhihui, Yang, Conglai, Zheng, Xiaobing, Dong, Chao, Huang, Tongming, Ma, Qiang, Zheng, Hongjuan, Liu, Ming, Wang, Zihan, and Zhou, Wenzhong
- Subjects
Physics - Accelerator Physics - Abstract
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., Comment: 5 pages, 6 figures
- Published
- 2023