4.3 Article

The Nonlinear Designs on a Frequency-Tunable THz Gyrotron With Three Frequency Regimes at 140, 250, and 263 GHz

期刊

IEEE TRANSACTIONS ON PLASMA SCIENCE
卷 49, 期 3, 页码 1247-1252

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2021.3057888

关键词

Gyrotrons; Tuning; Iris; Oscillators; Power generation; Q-factor; Nuclear magnetic resonance; Dynamic nuclear polarization (DNP); frequency-tunable gyrotron; nuclear magnetic resonance (NMR); terahertz (THz)

资金

  1. Dean Project of Guangxi Key Laboratory of Wireless Broadband Communication and Signal Processing [GXKL06190102]
  2. Guangxi Natural Science Foundation [AD19245042, 2019GXNSFBA245066]
  3. National Natural Science Foundation of China [62001131]

向作者/读者索取更多资源

A frequency-tunable THz gyrotron with a high-quality factor iris cavity is designed in this article, allowing for tuning at different frequency ranges with specific parameters adjustments for different output power and frequency tuning ranges. Comparison with 3D particle software confirmed the designed frequency and power tuning ranges.
Gyrotron, as a most likely practical high-power terahertz (THz) radiation source, has been widely applied to THz dynamic nuclear polarization-enhanced nuclear magnetic resonance (DNP-NMR) spectroscopy. In this article, an iris cavity with high-quality factor is theoretically designed for a frequency-tunable THz gyrotron, which could be tuned at three frequency regimes: 140, 250, and 263 GHz, respectively. Based on the self-developed nonlinear code, the beam wave interactions in the designed cavity are studied in detail when the corresponding high-order axial modes (HOAMs) are TE-6.1.q, TE0.4.q', and TE8.2.q ''. By tuning the applied magnetic field under the condition that the beam voltage U-0 is 20 kV and beam current I-0 is 0.10 A, the output power and frequency tuning ranges could achieve 0.75 kW and 1.15 GHz, 0.63 kW and 3.10 GHz, and 0.59 kW and 2.54 GHz. Meanwhile the calculation results are compared with the 3-D particle software CST, which have confirmed that the frequency and power tuning ranges of TE-6.1.q, TE0.4.q', and TE8.2.q '' could reach 0.46 kW and 1.07 GHz, 0.37 kW and 2.24 GHz, and 0.34 kW and 1.96 GHz. These results could be beneficial for the development of frequency-tunable gyrotron toward some up-and-coming novel THz applications.

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