학술논문
High Q and high gradient performance of the first medium-temperature baking 1.3 GHz cryomodule
Document Type
Working Paper
Author
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; Zhou, Wenzhong
Source
Subject
Language
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
Comment: 5 pages, 6 figures