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

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 t...

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Bibliographic Details
Published in:Nuclear science and techniques 2009-04, Vol.20 (2), p.65-70
Main Author: MA Zhenyu MA Guangming HOU Hongtao YU Haibo ZHANG Rui LIU Jianfei
Format: Article
Language:English
Subjects:
同轴传输线
外推法
实验测量
数值分析
耦合器件
评价因子
质量因子
超导腔
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Summary: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 temperature. In 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 case. For the unpolished 1.5 GHz 3^rd harmonic superconducting cavity, the discrepancy between the evaluation value and measurement result is less than 25% within an acceptable deviation.
ISSN:1001-8042
2210-3147