Study on the 1.3 GHz low loss shape

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

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.

作 者： ZONG Zhan-Guo GAO Jie GU Jun SUN Hong ZHAO Fa-Cheng GE Ming-Qi XU Qing-Jin ZHAI Ji-Yuan YUAN Hong CHEN Jin-Zhe XIE Wei-Ping K. Saito F. Furuta T. Saeki LIU Li-Qiang ZHANG Liang   作者单位： ZONG Zhan-Guo(Graduate University of Chinese Academy of Sciences, Beijing 100049, China)

GAO Jie,GU Jun,SUN Hong,ZHAO Fa-Cheng,GE Ming-Qi,XU Qing-Jin,ZHAI Ji-Yuan(Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China)

YUAN Hong(Beijing Institute of Aviation Materials, Beijing 100095, China)

CHEN Jin-Zhe(Beijing Hejili Science and Technology Development Co. Ltd., Beijing 100026, China)

XIE Wei-Ping(Ningxia Orient Tantalum Industry Co. Ltd., Shizuishan 753000, China)

K. Saito,F. Furuta,T. Saeki(High Energy Accelerator Research Organization (KEK), 1-10ho, Tsukuba, Ibaraki-305-0801, Japan)

LIU Li-Qiang,ZHANG Liang(Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China) 

刊 名： 中国物理C（英文版）  ISTIC 英文刊名： CHINESE PHYSICS　C  年，卷(期)： 2009 33(6)  分类号： O4  关键词： ILC   superconducting cavity   low loss   large grain niobium  

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