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This study investigates the design and performance of a 263 GHz continuous frequency-tunable gyrotron using a backward-wave component. The TE6,2 mode is selected for its broadband tuning capability and the cavity structure was optimized to enhance beam-wave interaction efficiency. Using self-consistent nonlinear theory, the mode competition and working conditions are analyzed, revealing that the TE6,2+ mode dominates within the magnetic field range of 9.55–10.29T. The results demonstrate a frequency tuning range of approximately 10 GHz (from 263.17 to 273 GHz) with the efficiency stabilizes at around 4%. This research provides valuable insights into the development of high-power, frequency-tunable gyrotrons for applications in fusion plasma heating and NMR spectroscopy.

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Design of a 263 GHz Broadband Frequency-Tunable Gyrotron

  • 会议论文

  • 发表日期：

    2026年

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  • Chenxi He,
  • Houxiu Xiao,
  • Xianfei Chen,
  • Weijian Liu,
  • Yuyang Sun

摘要

This study investigates the design and performance of a 263 GHz continuous frequency-tunable gyrotron using a backward-wave component. The TE6,2 mode is selected for its broadband tuning capability and the cavity structure was optimized to enhance beam-wave interaction efficiency. Using self-consistent nonlinear theory, the mode competition and working conditions are analyzed, revealing that the TE6,2+ mode dominates within the magnetic field range of 9.55–10.29T. The results demonstrate a frequency tuning range of approximately 10 GHz (from 263.17 to 273 GHz) with the efficiency stabilizes at around 4%. This research provides valuable insights into the development of high-power, frequency-tunable gyrotrons for applications in fusion plasma heating and NMR spectroscopy.