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Title: Harmonic gyrotrons operating in high-order symmetric modes

Abstract

It is shown that gyrotrons operating at cyclotron harmonics can be designed for operation in symmetric TE{sub 0,p}-modes. Such operation in fundamental harmonic gyrotrons is possible only at small radial indices (p≤3) because of the severe mode competition with TE{sub 2,p}-modes, which are equally coupled to annular beams as the symmetric modes. At cyclotron harmonics, however, this “degeneracy” of coupling is absent, and there is a region in the parameter space where harmonic gyrotrons can steadily operate in symmetric modes. This fact is especially important for sub-THz and THz-range gyrotrons where ohmic losses limit the power achievable in continuous-wave and high duty cycle regimes.

Authors:
; ;  [1]
  1. Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742-3511 (United States)
Publication Date:
OSTI Identifier:
22395676
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; CYCLOTRON HARMONICS; INDEXES; MICROWAVE AMPLIFIERS; OPERATION; SYMMETRY; THZ RANGE

Citation Formats

Nusinovich, Gregory S., Kashyn, Dmytro G., and Antonsen, T. M.. Harmonic gyrotrons operating in high-order symmetric modes. United States: N. p., 2015. Web. doi:10.1063/1.4905508.
Nusinovich, Gregory S., Kashyn, Dmytro G., & Antonsen, T. M.. Harmonic gyrotrons operating in high-order symmetric modes. United States. doi:10.1063/1.4905508.
Nusinovich, Gregory S., Kashyn, Dmytro G., and Antonsen, T. M.. Mon . "Harmonic gyrotrons operating in high-order symmetric modes". United States. doi:10.1063/1.4905508.
@article{osti_22395676,
title = {Harmonic gyrotrons operating in high-order symmetric modes},
author = {Nusinovich, Gregory S. and Kashyn, Dmytro G. and Antonsen, T. M.},
abstractNote = {It is shown that gyrotrons operating at cyclotron harmonics can be designed for operation in symmetric TE{sub 0,p}-modes. Such operation in fundamental harmonic gyrotrons is possible only at small radial indices (p≤3) because of the severe mode competition with TE{sub 2,p}-modes, which are equally coupled to annular beams as the symmetric modes. At cyclotron harmonics, however, this “degeneracy” of coupling is absent, and there is a region in the parameter space where harmonic gyrotrons can steadily operate in symmetric modes. This fact is especially important for sub-THz and THz-range gyrotrons where ohmic losses limit the power achievable in continuous-wave and high duty cycle regimes.},
doi = {10.1063/1.4905508},
journal = {Applied Physics Letters},
number = 1,
volume = 106,
place = {United States},
year = {Mon Jan 05 00:00:00 EST 2015},
month = {Mon Jan 05 00:00:00 EST 2015}
}