Study on the 1.3 GHz low loss shape superconducting cavities at IHEP  

作　　者：宗占国 高杰 谷俊 孙虹 赵发成 葛明骐 徐庆金 翟纪元 袁鸿 陈晋哲 颉维平 K.Saito F.Furuta T.Saeki 刘立强 张亮 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences [2]Technical Institute of Physics and Chemistry,Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences [4]Beijing Institute of Aviation Materials [5]Beijing Hejili Science and Technology Development Co.Ltd., [6]Ningxia Orient Tantalum Industry Co.Ltd., [7]High Energy Accelerator Research Organization(KEK)

出　　处：《Chinese Physics C》2009年第6期444-449,共6页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10525525)

摘　　要：As part of the international research program on the superconducting cavity for the International Linear Collider （ILC） R＆D on the 1.3 GHz low loss superconducting cavities has been carried out at the Institute of High Energy Physics （IHEP） since 2005. A design of 1.3 GHz low loss cavity shape was proposed and six single-cell cavities of different niobium material were successfully fabricated with standard technology. In this study our priority was on large grain （LG） cavities. The two LG cavities were treated with complete procedures of surface treatments based on chemical polishing （CP） without electro polishing （EP） at IHEP. The two LG cavities and a fine grain cavity were sent to KEK for vertical testing. All the three cavities reached accelerating gradients higher than 35 MV/m and the maximum gradient of 40.27 MV/m was achieved in the LG cavity. This paper presents the process of the vertical RF tests and the comparison of the LG and fine grain cavities＇s performance.As part of the international research program on the superconducting cavity for the International Linear Collider （ILC） R＆D on the 1.3 GHz low loss superconducting cavities has been carried out at the Institute of High Energy Physics （IHEP） since 2005. A design of 1.3 GHz low loss cavity shape was proposed and six single-cell cavities of different niobium material were successfully fabricated with standard technology. In this study our priority was on large grain （LG） cavities. The two LG cavities were treated with complete procedures of surface treatments based on chemical polishing （CP） without electro polishing （EP） at IHEP. The two LG cavities and a fine grain cavity were sent to KEK for vertical testing. All the three cavities reached accelerating gradients higher than 35 MV/m and the maximum gradient of 40.27 MV/m was achieved in the LG cavity. This paper presents the process of the vertical RF tests and the comparison of the LG and fine grain cavities＇s performance.

关 键 词：ILC superconducting cavity low loss large grain niobium 

分 类 号：O572.214[理学—粒子物理与原子核物理]