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Title: Curvature effect on tearing modes in presence of neoclassical friction

Neoclassical physics (here associated to the poloidal variation of the magnetic field strength along field lines in a tokamak) is well known for driving self-generated plasma current and nonlinear magnetic islands associated to it in high performance, ITER relevant plasma discharges. It is demonstrated that the neoclassical friction between a magnetic perturbation and plasma flow already impacts magnetic islands in the linear regime, by inducing a weakening of curvature stabilization for tearing modes. This conclusion holds in particular for regimes where convection is influencing the pressure dynamics, as shown using a simple analytical model and confirmed in full Magneto-Hydro-Dynamics simulations.
Authors:
; ; ;  [1] ;  [2]
  1. CEA, IRFM, F-13108 Saint Paul-lez-Durance (France)
  2. Centre de Physique Théorique, Ecole Polytechnique, CNRS (France)
Publication Date:
OSTI Identifier:
22218424
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 11; Other Information: (c) 2013 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; CONVECTION; DISTURBANCES; ELECTRIC CURRENTS; FRICTION; ITER TOKAMAK; MAGNETIC FIELDS; MAGNETIC ISLANDS; MAGNETOHYDRODYNAMICS; NEOCLASSICAL TRANSPORT THEORY; NONLINEAR PROBLEMS; PERFORMANCE; PLASMA; PLASMA CONFINEMENT; PLASMA SIMULATION; TEARING INSTABILITY