High power wideband gyrotron backward wave oscillator operating towards the terahertz region

Wenlong He, Craig Donaldson, Liang Zhang, Kevin Ronald, Paul McElhinney, Adrian Cross

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Experimental results are presented of the first successful gyrotron backward wave oscillator (gyro-BWO) in the low terahertz region. A helically corrugated interaction region (HCIR) was used to allow efficient interaction over a wide frequency band at the second harmonic of the electron cyclotron frequency without parasitic output. The gyro-BWO was measured to generate a maximum output power of 12 kW in a continuous frequency tuning band of 88-102.5 GHz when driven by a 40 kV, 1.5 A, annular-shaped large-orbit electron beam. The performance of the gyro-BWO is consistent with 3D particle-in-cell (PIC) numerical simulations.
Original languageEnglish
Article number165101
Number of pages5
JournalPhysical Review Letters
Issue number16
Early online date15 Apr 2013
Publication statusPublished - 15 Apr 2013


  • gyrotron backward wave oscillator
  • wideband
  • oscillator
  • terahertz region

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