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Modelling and Comparison with Experiment of Radial Profiles in a Tokamak with Magnetic Field Stochastization
Author(s) -
Loozen X.,
Kalupin D.,
Tokar M. Z.,
Marchuk O.,
Jakubowski M.
Publication year - 2006
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200610067
Subject(s) - tokamak , divertor , physics , diamagnetism , magnetic field , plasma , field line , mechanics , computational physics , nuclear physics , quantum mechanics
A deliberate stochastization of the magnetic field in tokamaks with Ergodic Divertors (ED) modi.es essentially the transport properties at the plasma edge by permitting a radial transfer of particles and heat along stochastic field lines and affecting anomalous transport perpendicular to them. A model for the effective transport coefficients in a stochastic magnetic field, taking into account both parallel flows and perpendicular transfer of anomalous nature, has been incorporated into the 1.5D transport code RITM for self‐consistent calculations of the radial profiles of plasma parameters. Computations have been performed for the tokamak TEXTOR to simulate phases in an ohmic shot without and with the Dynamic Ergodic Divertor (DED). Results show that the increase of the outward convective transport in the stochastic boundary layer leads to a drop of the line average density. The experimentally observed density variation is reproduced by adjusting the amplitude of the stochastization characteristics with their radial dependence predicted by the field line mapping. The decrease of the diamagnetic energy after DED activation is in qualitative agreement with the experimental data from the diamagnetic loop measurements. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)