Development of a magnetic cusp gun for a 1-THz harmonic gyrotron

Fan-Hong Li, Chao-Hai Du, Zi-Wen Zhang, Si-Qi Li, Zi-Chao Gao, Juan-Feng Zhu, Guo-Wu Ma, Qi-Li Huang, Hong-Ge Ma, Liang Zhang, Adrian W. Cross, Pu-Kun Liu

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High-quality axis-encircling electron beam is essential to drive a high-harmonic gyrotron. A magnetic cusp gun that can generate a low-spread axis-encircling electron beam at an extremely high magnetic-compression ratio was developed for a 1-THz 4th-harmonic gyrotron toward continuous-wave operation. The optimized gun could generate an axis-encircling electron beam with 80-kV voltage, 1-A current, and a nearly constant pitch factor of about 1.5 in a wide range of magnetic field strength. The transverse velocity spread was less than 2.1% and the guiding center radius was 26.6 µm. The design was verified by using MAGIC, EGUN, and CST simulations and good agreements were achieved.
Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalIEEE Transactions on Electron Devices
Publication statusAccepted/In press - 7 Oct 2021


  • magnetic cusp gun
  • axis-encircling beam
  • THz gyrotron


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