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Title: Quasi-linear analysis of the extraordinary electron wave destabilized by runaway electrons

Runaway electrons with strongly anisotropic distributions present in post-disruption tokamak plasmas can destabilize the extraordinary electron (EXEL) wave. The present work investigates the dynamics of the quasi-linear evolution of the EXEL instability for a range of different plasma parameters using a model runaway distribution function valid for highly relativistic runaway electron beams produced primarily by the avalanche process. Simulations show a rapid pitch-angle scattering of the runaway electrons in the high energy tail on the 100–1000 μs time scale. Due to the wave-particle interaction, a modification to the synchrotron radiation spectrum emitted by the runaway electron population is foreseen, exposing a possible experimental detection method for such an interaction.
Authors:
; ;  [1] ; ;  [2]
  1. Department of Nuclear Techniques, Budapest University of Technology and Economics, Budapest (Hungary)
  2. Department of Applied Physics, Chalmers University of Technology, Göteborg (Sweden)
Publication Date:
OSTI Identifier:
22299674
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 10; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DISTRIBUTION FUNCTIONS; PLASMA; PLASMA INSTABILITY; RELATIVISTIC RANGE; RUNAWAY ELECTRONS; SYNCHROTRON RADIATION; TOKAMAK DEVICES