Precise calibration of cavity forward and reflected signals using low-level radio-frequency system

Jin-Ying Ma; Feng Qiu; Long-Bo Shi; Zheng-Long Zhu; Tian-Cai Jiang; Zong-Heng Xue; Ke-An Jin; Qi Chen; Cheng-Ye Xu; Xing-Hao Ding; Zheng Gao; Lie-Peng Sun; Gui-Rong Huang; Yuan He

doi:10.1007/s41365-022-00985-4

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Precise calibration of cavity forward and reflected signals using low-level radio-frequency system

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2022-02-17

- Precise calibration of cavity forward and reflected signals using low-level radio-frequency system
- Precise calibration of cavity forward and reflected signals using low-level radio-frequency system
- Nuclear Science and Techniques 2022年33卷第1期文章编号：4
- 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：
  
  qiufeng@impcas.ac.cn
- Funds：
  
  project of "studies of intelligent LLRF control algorithms for superconducting RF cavities(E129851YR0)
- DOI：10.1007/s41365-022-00985-4
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Jin-Ying Ma, Feng Qiu, Long-Bo Shi, 等. Precise calibration of cavity forward and reflected signals using low-level radio-frequency system[J]. Nuclear Science and Techniques, 2022,33(1):4

Jin-Ying Ma, Feng Qiu, Long-Bo Shi, et al. Precise calibration of cavity forward and reflected signals using low-level radio-frequency system[J]. Nuclear Science and Techniques, 2022,33(1):4
Jin-Ying Ma, Feng Qiu, Long-Bo Shi, 等. Precise calibration of cavity forward and reflected signals using low-level radio-frequency system[J]. Nuclear Science and Techniques, 2022,33(1):4 DOI： 10.1007/s41365-022-00985-4.

Jin-Ying Ma, Feng Qiu, Long-Bo Shi, et al. Precise calibration of cavity forward and reflected signals using low-level radio-frequency system[J]. Nuclear Science and Techniques, 2022,33(1):4 DOI： 10.1007/s41365-022-00985-4.

摘要

Abstract

Precise measurements of the cavity forward (,V,f,) and reflected signals (,V,r,) are essential for characterizing other key parameters such as the cavity detuning and forward power. In practice, it is challenging to measure ,V,f, and ,V,r, precisely because of crosstalk between the forward and reflected channels (e.g., coupling between the cavity reflected and forward signals in a directional coupler with limited directivity). For DESY, a method based on the cavity differential equation was proposed to precisely calibrate the actual ,V,f, and ,V,r,. In this study, we verified the validity and practicability of this approach for the Chinese ADS front-end demo superconducting linac (CAFe) facility at the Institute of Modern Physics and a compact energy recovery linac (cERL) test machine at KEK. At the CAFe facility, we successfully calibrated the actual ,V,f, signal using this method. The result demonstrated that the directivity of directional couplers might seriously affect the accuracy of ,V,f, measurement. At the cERL facility, we calibrated the Lorentz force detuning (LFD) using the actual ,V,f,. Our study confirmed that the precise calibration of ,V,f, significantly improves the accuracy of the cavity LFD measurement.

关键词

Keywords

Forward and reflected signalsMeasurementCalibration

references

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