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Title: Synchrotron radiation from a runaway electron distribution in tokamaks

The synchrotron radiation emitted by runaway electrons in a fusion plasma provides information regarding the particle momenta and pitch-angles of the runaway electron population through the strong dependence of the synchrotron spectrum on these parameters. Information about the runaway density and its spatial distribution, as well as the time evolution of the above quantities, can also be deduced. In this paper, we present the synchrotron radiation spectra for typical avalanching runaway electron distributions. Spectra obtained for a distribution of electrons are compared with the emission of mono-energetic electrons with a prescribed pitch-angle. We also examine the effects of magnetic field curvature and analyse the sensitivity of the resulting spectrum to perturbations to the runaway distribution. The implications for the deduced runaway electron parameters are discussed. We compare our calculations to experimental data from DIII-D and estimate the maximum observed runaway energy.
Authors:
;  [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Department of Applied Physics, Nuclear Engineering, Chalmers University of Technology and Euratom-VR Association, SE-412 96 Göteborg (Sweden)
  2. Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts 02139 (United States)
  3. (Hungary)
  4. Center for Energy Research, University of California, San Diego, La Jolla, California 92093-0417 (United States)
Publication Date:
OSTI Identifier:
22220633
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 9; Other Information: (c) 2013 Euratom; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPARATIVE EVALUATIONS; DOUBLET-3 DEVICE; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; PERTURBATION THEORY; PLASMA; PLASMA CONFINEMENT; RUNAWAY ELECTRONS; SPATIAL DISTRIBUTION; SPECTRA; SYNCHROTRON RADIATION; SYNCHROTRONS; TAIL ELECTRONS; THERMONUCLEAR REACTORS