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Title: Saturation of the fan instability: Nonlinear merging of resonances

Abstract

A Hamiltonian self-consistent wave-particle model has been built in order to study the nonlinear interaction of a packet of waves with a nonequilibrium electron distribution in a magnetized background plasma. In particular, this model and the corresponding numerical code allow us to study in detail the excitation by the fan instability of lower hybrid waves interacting resonantly with a strongly anisotropic electron velocity distribution. This paper points out the essential role played by the process of ''dynamical merging of resonances,'' which results from an instability of the trapped particles' motion, leading, in its explosive stage, to the amplification of the waves' amplitudes. Moreover the relaxation phase of the fan instability is shown to lead to a universal distribution of the particles' velocities, which does not depend on the number of waves and on their distribution in the k space.

Authors:
; ;  [1];  [2];  [3]
  1. Laboratoire de Physique des Gaz et des Plasmas, Universite Paris Sud, 91405 Orsay Cedex (France)
  2. (Russian Federation)
  3. (France)
Publication Date:
OSTI Identifier:
20782338
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 12; Journal Issue: 11; Other Information: DOI: 10.1063/1.2118727; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; AMPLITUDES; ANISOTROPY; DISTRIBUTION; ELECTRONS; EXCITATION; HAMILTONIANS; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; NONLINEAR PROBLEMS; PLASMA; PLASMA INSTABILITY; RELAXATION; RESONANCE; TRAPPING; VELOCITY

Citation Formats

Krafft, C., Volokitin, A., Zaslavsky, A., Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Academy of Sciences, Troitsk, Moscow Region, 142190, and Laboratoire de Physique des Gaz et des Plasmas, Universite Paris Sud, 91405 Orsay Cedex. Saturation of the fan instability: Nonlinear merging of resonances. United States: N. p., 2005. Web. doi:10.1063/1.2118727.
Krafft, C., Volokitin, A., Zaslavsky, A., Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Academy of Sciences, Troitsk, Moscow Region, 142190, & Laboratoire de Physique des Gaz et des Plasmas, Universite Paris Sud, 91405 Orsay Cedex. Saturation of the fan instability: Nonlinear merging of resonances. United States. doi:10.1063/1.2118727.
Krafft, C., Volokitin, A., Zaslavsky, A., Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Academy of Sciences, Troitsk, Moscow Region, 142190, and Laboratoire de Physique des Gaz et des Plasmas, Universite Paris Sud, 91405 Orsay Cedex. Tue . "Saturation of the fan instability: Nonlinear merging of resonances". United States. doi:10.1063/1.2118727.
@article{osti_20782338,
title = {Saturation of the fan instability: Nonlinear merging of resonances},
author = {Krafft, C. and Volokitin, A. and Zaslavsky, A. and Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Academy of Sciences, Troitsk, Moscow Region, 142190 and Laboratoire de Physique des Gaz et des Plasmas, Universite Paris Sud, 91405 Orsay Cedex},
abstractNote = {A Hamiltonian self-consistent wave-particle model has been built in order to study the nonlinear interaction of a packet of waves with a nonequilibrium electron distribution in a magnetized background plasma. In particular, this model and the corresponding numerical code allow us to study in detail the excitation by the fan instability of lower hybrid waves interacting resonantly with a strongly anisotropic electron velocity distribution. This paper points out the essential role played by the process of ''dynamical merging of resonances,'' which results from an instability of the trapped particles' motion, leading, in its explosive stage, to the amplification of the waves' amplitudes. Moreover the relaxation phase of the fan instability is shown to lead to a universal distribution of the particles' velocities, which does not depend on the number of waves and on their distribution in the k space.},
doi = {10.1063/1.2118727},
journal = {Physics of Plasmas},
number = 11,
volume = 12,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2005},
month = {Tue Nov 15 00:00:00 EST 2005}
}