Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (4): 50 doi: 10.1007/s41365-018-0383-3


Novel method to measure unloaded quality factor of resonant cavities at room temperature

Ping Wang 1,2  Jia-Ru Shi 1,2  Zheng-Feng Xiong Ze-Ning Liu 1,2  Cheng Cheng 1,2  Huai-Bi Chen 1,2   

  1. 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China
    2 Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Tsinghua University, Beijing 100084, China
    3 Northwest Institute of Nuclear Technology, Xi’an 710024, China
  • Contact: Ping Wang
  • Supported by:

    This work was supported by the National Key Research and Development Program of China (No. 2016YFA0401902).

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Ping Wang, Jia-Ru Shi, Zheng-Feng Xiong, Ze-Ning Liu, Cheng Cheng, Huai-Bi Chen. Novel method to measure unloaded quality factor of resonant cavities at room temperature.Nuclear Science and Techniques, 2018, 29(4): 50     doi: 10.1007/s41365-018-0383-3


We demonstrated a novel method to measure the unloaded quality factor (Q factor) of high-Q resonant cavities. This method was used to obtain data with low errors and calculate the unloaded Q factor. This procedure was more reliable than traditional methods. The data required for the method were near the resonant frequency, not at the half-power points of the reflection coefficient curve or Smith chart. We applied the new method to measure a resonant cavity with an unloaded Q factor of ~ 100,000, obtaining good agreement between the measured and theoretical results.

Key words: Resonant cavity, Q factor, LRC circuit, Coupling coefficient