High-efficiency wideband gyro-TWTs and gyro-BWOs with helically corrugated waveguides

V.L. Bratman, G.G. Denisov, S.V. Samsonov, A.W. Cross, A.D.R. Phelps, W. Xe

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


We review the studies of gyrotron-type microwave devices whose electrodynamic system has the form of an oversized metal waveguide with a helically corrugated internal surface. For certain parameters, such a corrugation changes radically the waveguide dispersion ensuring an almost constant group velocity of the eigenmode for a small (close to zero) longitudinal wave number in a wide frequency band. The use of ``helical'' waveguides along with electron optical systems which form near-axis electron beams makes it possible to create high-efficiency amplifiers based on gyro-traveling-wave tubes (gyro-TWTs) with a wide instantaneous frequency band of amplification and gyro-backward-wave oscillators (gyro-BWOs) with continuous wideband tuning of the oscillation frequency. The studied devices are superior to the well-studied microwave sources of this type (gyroklystrons and gyrotrons) in frequency band, by more than an order of magnitude, and are not inferior to them in efficiency even for a wide spread of electron velocities.
Original languageEnglish
Pages (from-to)95-107
Number of pages13
JournalRadiophysics and Quantum Electronics
Issue number2
Publication statusPublished - 1 Feb 2007


  • gyrotron-type microwave devices
  • electron optical systems
  • gyro-traveling-wave tubes
  • gyro-backward-wave oscillators


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