Evaluation of external quality factor of the superconducting cavity using extrapolation method

作     者：MA Zhenyu MA Guangming HOU Hongtao YU Haibo ZHANG Rui LIU Jianfei 

作者机构：Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2009年第20卷第2期

页      面：65-70页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 082903[工学-林产化学加工工程] 08[工学] 0829[工学-林业工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 082201[工学-制浆造纸工程] 0822[工学-轻工技术与工程] 

基　　金：Supported by project Science and Technology Commission of Shanghai Municipality (026505027  036505011) 

主　　题：质量因子 超导腔 外推法 评价因子 耦合器件 实验测量 同轴传输线 数值分析 

摘      要：The estimation of the external quality factor is important for designing coupling devices for the cavities.A new representation of the external quality factor calculations for single-cell cavity coupled to a coaxial transmission line is derived based on analytic analysis and numeric analysis with the help of 3D electromagnetic code,and verified with experimental measurements at room *** logarithmic scale the results for the external quality factor were quasi-linear over the limited range,and the simulated and measured data could be used and extrapolated to the superconducting *** the unpolished 1.5 GHz 3rd harmonic superconducting cavity,the discrepancy between the evaluation value and measurement result is less than 25% within an acceptable deviation.