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电信和无线电工程
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN 打印: 0040-2508
ISSN 在线: 1943-6009

卷:
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电信和无线电工程

DOI: 10.1615/TelecomRadEng.v77.i6.40
pages 513-523

AXIAL MAGNETIC FIELD EFFECTS IN WAVE AMPLIFICATION IN BEAM-PLASMA SUPERHETERODYNE FREE ELECTRON LASER OF THE DOPPLERTRON TYPE

A. V. Lysenko
Sumy State University, 2 Rymskogo-Korsakova St., 40007 Sumy, Ukraine
G. A. Oleksiienko
Sumy State University, 2 Rymskogo-Korsakova St., 40007 Sumy, Ukraine
A. V. Pavlov
Sumy State University, 2 Rymskogo-Korsakova St., 40007 Sumy, Ukraine

ABSTRACT

The research is devoted to the amplification characteristics of beam-plasma superheterodyne free-electron laser of the dopplertron type. The influence of an axial magnetic field on the wave amplification in such a device will be investigated to find the optimal operation mode.
The quasihydrodynamic equation, the continuity equation and Maxwell's equations were used as the initial ones. The motion and continuity problem was solved by means of an updated averaged characteristics approach. The slowly-varying amplitudes method was applied to solve the problem of electromagnetic self-fields excitation.
The influence of the axial guiding magnetic field on the wave dynamics in a plasma-beam superheterodyne free electron laser with dopplertron pumping was analyzed in terms of the cubic nonlinear approximation. It was revealed that the strength of electromagnetic radiation increased with the magnitude of the axial guiding magnetic field becoming critically low. The critical value of magnetic field strength and the saturation levels of electromagnetic waves were found.
The study proved the ability of the free electron laser in question to efficiently amplify electromagnetic radiation in the millimeter wave band.


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