Ultra-high quality factor and ultra-high accelerating gradient achievements in a 1.3 GHz continuous wave cryomodule  

作　　者：Jin-Fang Chen Yue Zong Xiao-Yun Pu Sheng-Wang Xiang Shuai Xing Zheng Li Xu-Ming Liu Yan-Fei Zhai Xiao-Wei Wu Yong-Zhou He Ling-Ling Gong Ji-Dong Zhang Shan-Shan Cao Wen-Ding Fang Bin-Tuan Zhang Kai Xu Yi-Bo Yu Guang-Hua Chen Li-Jun Lu Ya-Wei Huang Shen-Jie Zhao Hong-Tao Hou Zhen-Yu Ma Ye-Liang Zhao Xiang Zheng Jiu-Ce Sun Sen Sun Zhi-Qiang Jiang Yu-Bin Zhao Meng Zhang Ying-Bing Yan Yi-Yong Liu Qiang Gu Bo Liu Li-Xin Yin Dong Wang Hai-Xiao Deng Zhen-Tang Zhao 

机构地区：[1]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [2]Zhangjiang Laboratory,201210 Shanghai,China [3]ShanghaiTech University,Shanghai 201210,China

出　　处：《Nuclear Science and Techniques》2025年第2期18-26,共9页核技术(英文)

基　　金：supported by Zhangjiang Laboratory,the SHINE R&D project(No.2017SHZDZX02);the SHINE project;the National Natural Science Foundation of China(No.12125508).

摘　　要：We report the world-leading performance of a 1.3 GHz cryomodule equipped with eight 9-cell superconducting radio-frequency cavities that underwent a medium-temperature furnace baking process.During continuous wave horizontal testing,these cavities achieved unprecedented average intrinsic quality factors of 4.0×10^(10)at 20 MV/m and 3.2×10^(10)at 29 MV/m,with no instances of field emission.The cryomodule demonstrates near-complete preservation of ultra-high quality factors and ultra-high accelerating gradients from vertical to horizontal testing,marking a significant milestone in continuous-wave superconducting radio-frequency accelerator technology.This letter presents the cryomodule development experience,includ-ing cavity preparation,cryomodule assembly,degaussing,fast cooldown,and performance testing.

关 键 词：SRF cryomodule Mid-T baking High quality factor High accelerating gradient 

分 类 号：TL50[核科学技术—核技术及应用]