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Author Girka, I. O. ♦ Girka, V. O. ♦ Sydora, R. D. ♦ Thumm, M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ BOLTZMANN EQUATION ♦ BOUNDARY CONDITIONS ♦ CYCLOTRON FREQUENCY ♦ CYCLOTRON HARMONICS ♦ CYCLOTRONS ♦ ELECTRIC FIELDS ♦ ELECTRONS ♦ EXCITATION ♦ INTERFACES ♦ MAGNETIC FIELDS ♦ MAXWELL EQUATIONS ♦ METALS ♦ MONOCHROMATIC RADIATION ♦ NONLINEAR PROBLEMS ♦ NUMERICAL ANALYSIS ♦ PARAMETRIC INSTABILITIES ♦ PLASMA ♦ SURFACES ♦ WAVE PACKETS ♦ WAVEGUIDES
Abstract The influence of non-monochromaticity of an external alternating electric field on excitation of TM eigenmodes at harmonics of the electron cyclotron frequency is considered here. These TM-modes propagate along the plasma interface in a metal waveguide. An external static constant magnetic field is oriented perpendicularly to the plasma interface. The problem is solved theoretically using the kinetic Vlasov-Boltzmann equation for description of plasma particles motion and the Maxwell equations for description of the electromagnetic mode fields. The external alternating electric field is supposed to be a superposition of two waves, whose amplitudes are different and their frequencies correlate as 2:1. An infinite set of equations for electric field harmonics of these modes is derived with the aid of nonlinear boundary conditions. This set is solved using the wave packet approach consisting of the main harmonic frequency and two nearest satellite temporal harmonics. Analytical studies of the obtained set of equations allow one to find two different regimes of parametric instability, namely, enhancement and suppression of the instability. Numerical analysis of the instability is carried out for the three first electron cyclotron harmonics.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 6


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