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Title: Parametric decay of an extraordinary electromagnetic wave in relativistic plasma

Parametric instability of an extraordinary electromagnetic wave in plasma preheated to a relativistic temperature is considered. A set of self-similar nonlinear differential equations taking into account the electron “thermal” mass is derived and investigated. Small perturbations of the parameters of the heated plasma are analyzed in the linear approximation by using the dispersion relation determining the phase velocities of the fast and slow extraordinary waves. In contrast to cold plasma, the evanescence zone in the frequency range above the electron upper hybrid frequency vanishes and the asymptotes of both branches converge. Theoretical analysis of the set of nonlinear equations shows that the growth rate of decay instability increases with increasing initial temperature of plasma electrons. This result is qualitatively confirmed by numerical simulations of plasma heating by a laser pulse injected from vacuum.
Authors:
 [1] ;  [2] ;  [3]
  1. Institute for Advanced Studies (Austria)
  2. Keldysh Institute of Applied Mathematics (Russian Federation)
  3. Peoples’ Friendship University of Russia (Russian Federation)
Publication Date:
OSTI Identifier:
22472418
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLD PLASMA; COMPUTERIZED SIMULATION; DECAY INSTABILITY; DIFFERENTIAL EQUATIONS; DISPERSION RELATIONS; DISTURBANCES; ELECTROMAGNETIC RADIATION; ELECTRONS; NONLINEAR PROBLEMS; PARAMETRIC INSTABILITIES; PHASE VELOCITY; PLASMA HEATING; RELATIVISTIC PLASMA