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Physics of Plasmas / Volume 15 / Issue 10 / ARTICLES / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 15, 103106 (2008); http://dx.doi.org/10.1063/1.2992134 (9 pages)

Effect of the transverse nonuniformity of the radiofrequency field on the start current and efficiency of gyrodevices with confocal mirrors

Gregory S. Nusinovich, Samir Chainani, and Victor L. Granatstein

Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742-3511, USA

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(Received 21 July 2008; accepted 10 September 2008; published online 7 October 2008)

The theory is developed for analyzing the effect of transverse nonuniformity of the radiofrequency (rf) field on the starting conditions and efficiency of such gyrotron oscillators as gyromonotrons and gyro-backward-wave oscillators (gyro-BWO). The formalism allows one to study this effect in oscillators operating in the regimes of soft and hard self-excitation. Results obtained for a device with a confocal waveguide (or resonator) are compared with the results for conventional gyrodevices where the rf field acting on electrons with different guiding centers is the same. It is shown how to use results of the classical small-signal theory of backward-wave oscillators driven by linear electron beams for calculating the start currents in gyro-BWOs. The effect of the wave attenuation in waveguide walls on the start current is analyzed, which is important for the design of frequency-tunable gyro-backward-wave oscillators in the THz (and sub THz) frequency range.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. GENERAL RELATIONS
    1. Polynomial approximation
    2. Linear theory of the gyrotron and the gyro-BWO
    3. Nonlinear theory
  3. COMPARISON OF TWO MODELS
    1. Coupling factors, coefficients a , b , and c , and the effect of nonuniformity on the orbital efficiency
    2. Start currents
  4. DISCUSSION
  5. SUMMARY

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KEYWORDS and PACS

Keywords

backward wave oscillators, electron beams, gyrotrons, microwave oscillators, waveguides

PACS

  • 84.40.Ik

    Masers; gyrotrons (cyclotron-resonance masers)

  • 84.40.Fe

    Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)

  • 84.40.Az

    Waveguides, transmission lines, striplines

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2992134

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    K. R. Chu, Rev. Mod. Phys. 76, 489 (2004).

    P. Sprangle, J. L. Vomvoridis, and W. M. Manheimer, Appl. Phys. Lett. 38, 310 (1981)APPLAB000038000005000310000001.

    J. R. Sirigiri, M. A. Shapiro, and R. J. Temkin, Phys. Rev. Lett. 90, 258302 (2003).

    T. M. Antonsen, Jr., B. Levush, and W. M. Manheimer, Phys. Fluids B 2, 419 (1990)PFBPEI000002000002000419000001.


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