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Title: Convective amplification of a three-wave parametric instability in inhomogeneous plasma

The three-wave parametric instability in inhomogeneous plasma is revisited and the inconsistency of the convective amplification in previous literatures is resolved. By employing multiple methods, the amplification factor of the decay mode due to the inhomogeneity is confirmed as A=πγ{sub 0}{sup 2}/(v{sub g1x}v{sub g2x}κ{sup ′}), which is independent of the linear damping rate of the decay mode, where γ{sub 0} is the nonlinear growth rate in homogeneous plasma, v{sub g1x} and v{sub g2x} are the group velocities in the x direction of the two decay modes and κ{sup ′} is the derivative of the wavevector mismatch of the three coupled waves due to the plasma inhomogeneity.
Authors:
;  [1]
  1. Department of Engineering Physics, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
22218470
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; CONVECTION; DAMPING; HOMOGENEOUS PLASMA; INHOMOGENEOUS PLASMA; NONLINEAR PROBLEMS; PARAMETRIC INSTABILITIES; PLASMA WAVES; VELOCITY