Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier

Chan Wook Baik, Seok Gy Jeon, Dae Ho Kim, Nobuyuki Sato, Kuniyoshi Yokoo, Gun Sik Park

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signal induced by the third-harmonic component of the modulated beam current is chosen to be extracted from the output stage. Both interaction stages are linearly tapered to improve stability and bandwidth. The third-harmonic frequency multiplication is predicted theoretically and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation, which estimate a pure third-harmonic generation and a power-scaling law. In the experiment, X-band drive signals from 10.6-12 GHz are multiplied by a factor of three to produce Ka-band output frequencies from 31.8-36 GHz, showing reasonable agreement with theoretical predictions for a 30-kV, 160-mA axis-encircling electron beam.

Original languageEnglish
Pages (from-to)829-838
Number of pages10
JournalIEEE Transactions on Electron Devices
Issue number5
Publication statusPublished - 2005 May


  • Frequency multiplication
  • Gyrotron
  • Gyrotron traveling wave tube (gyro-TWT)
  • Harmonic frequency


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