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Title: Impurity behavior during sawtooth activity in tokamak plasmas

The transport of impurities by a sawtooth crash is simulated with the XTOR-2F code. Impurities are modeled as passive scalars, evolving in the compressible MHD flow inferred from the main MHD plasma. For a peaked impurity density profile, the non-linear kink flow of the sawtooth crash redistributes the profile efficiently and most of the particles in the peak inside the q = 1 surface are expelled. For an initially hollow impurity density profile, the crash leads to a significant penetration up to the magnetic axis. The results are compared with Kadomtsev's model. Despite essentially different mechanisms, the evolution of the particle content inside the q = 1 surface for Kadomtsev's model and for the non-linear case are virtually identical for the peaked profile, while the model slightly overestimates penetration for the hollow case.
Authors:
; ;  [1] ; ;  [2]
  1. CEA, IRFM, F-13108 Saint-Paul-Lez-Durance (France)
  2. Centre de Physique Théorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau Cedex (France)
Publication Date:
OSTI Identifier:
22252161
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 1; Other Information: (c) 2014 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; IMPURITIES; MAGNETOHYDRODYNAMICS; PEAKS; PLASMA; PLASMA INSTABILITY; SAWTOOTH OSCILLATIONS; TOKAMAK DEVICES