Nonlinear Landau effect in the case of an electron plasma wave spectrum
Abstract
A broad waveband spectrum of 'electronplasma' type interacting with an argon plasma column was investigated. The experimental conditions induce a relaxation dispersion preventing any phenomenon of three wave resonance coupling. The spectrum is shifted towards low frequencies; plasma noise waves, with frequencies below that of the injected spectrum, grow when the observation distance increases, or when the power injected in the spectrum becomes more important. A comparison of theoretical and experimental results is deduced from a numerical calculation of the terms of the equation of spectrum evolution (VlasovPoisson equation) which takes account for initial conditions. A good agreement is obtained except for a very restricted zone where a four wave coupling appears. The theory predicts the creation of beating waves with a phase velocity to the group velocity of the spectrum waves. The property of spatial conservation of the plasmon flux is experimentally verified.
 Publication:

Ph.D. Thesis
 Pub Date:
 December 1976
 Bibcode:
 1976PhDT........42G
 Keywords:

 Electron Plasma;
 Landau Damping;
 Plasma Interactions;
 Plasma Resonance;
 Plasma Waves;
 Wave Interaction;
 Plasma Physics