Measurement of the cavity-loaded quality factor in superconducting radio-frequency systems with mismatched source impedance

Jin-Ying Ma; Cheng-Ye Xu; An-Dong Wu; Guo-Dong Jiang; Yue Tao; Zong-Heng Xue; Long-Bo Shi; Tian-Cai Jiang; Zheng-Long Zhu; Zi-Qin Yang; Zheng Gao; Lie-Peng Sun; Gui-Rong Huang; Feng Qiu; Yuan He

doi:10.1007/s41365-023-01281-5

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Measurement of the cavity-loaded quality factor in superconducting radio-frequency systems with mismatched source impedance

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | Updated：2023-09-19

- Measurement of the cavity-loaded quality factor in superconducting radio-frequency systems with mismatched source impedance
- Nuclear Science and Techniques Vol. 34, Issue 8, Article number: 123(2023)
- Affiliations：
  
  1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  2.School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  † antonwoo@impcas.ac.cn
  ‡ qiufeng@impcas.ac.cn
- Funds：
- DOI：10.1007/s41365-023-01281-5
  CLC：
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Jin-Ying Ma, Cheng-Ye Xu, An-Dong Wu, et al. Measurement of the cavity-loaded quality factor in superconducting radio-frequency systems with mismatched source impedance. [J]. Nuclear Science and Techniques 34(8):123(2023)
DOI：

Jin-Ying Ma, Cheng-Ye Xu, An-Dong Wu, et al. Measurement of the cavity-loaded quality factor in superconducting radio-frequency systems with mismatched source impedance. [J]. Nuclear Science and Techniques 34(8):123(2023) DOI： 10.1007/s41365-023-01281-5.

摘要

Abstract

The accurate measurement of parameters such as the cavity-loaded quality factor (,Q,L,) and half bandwidth (,f,0.5,) is essential for monitoring the performance of superconducting radio-frequency (SRF) cavities. However, the conventional "field decay method" employed to calibrate these values requires the cavity to satisfy a "zero-input" condition. This can be challenging when the source impedance is mismatched and produce nonzero forward signals (,V,f,) that significantly affect the measurement accuracy. To address this limitation, we developed a modified version of the "field decay method" based on the cavity differential equation. The proposed approach enables the precise calibration of ,f,0.5, even under mismatch conditions. We tested the proposed approach on the SRF cavities of the Chinese Accelerator Driven System Front-End Demo Superconducting Linac and compared the results with those obtained from a network analyzer. The two sets of results were consistent, indicating the usefulness of the proposed approach.

关键词

Keywords

Loaded quality factorField decay methodSuperconducting cavityMismatchCalibrationCavity differential equationMeasurementAccelerator driven system

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