Study of 1-THz 4th-harmonic gyrotron

Chao-Hai Du, Fan-Hong Li, Shi Pan, Pu-Kun Liu, Liang Zhang, Wen-Long He, Hua-Bi Yin, K. Ronald, Adrian W. Cross

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A preliminary design of a 1-THz gyrotron based on the fourth harmonic operation is presented. The cylindrical-waveguide TE4,8 mode is selected as the operating mode. Considering the weak beam-wave coupling strength in a 4th-harmonic open-cavity interaction circuit at the frequency of 1 THz, this paper proposes applying low-temperature cooling, for example applying liquid nitrogen, to increase the limit of the Q factor and extend the effective length of the cavity resulting in a significant enhancement of the interaction efficiency and suppression of ohmic losses. Applying multi-mode time-domain theory in the simulation, it was found that although the competing third-harmonic TE3,6 mode was excited first, the fourth-harmonic TE4,8 mode finally dominates in the steady state regime.
Original languageEnglish
Number of pages3
Publication statusPublished - 20 Aug 2019
Event12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019) - Queen Mary University of London, London, United Kingdom
Duration: 20 Aug 201922 Aug 2019


Conference12th UK-Europe-China Workshop on Millimetre Waves and THz Technologies (UCMMT 2019)
Abbreviated titleUCMMT 2019
Country/TerritoryUnited Kingdom
Internet address


  • electron cyclotron maser
  • gyrotron
  • ohmic loss
  • quality factor
  • sectioned cavity
  • terahertz


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