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Curvature effect on tearing modes in presence of neoclassical friction

Authors :
Nicolas Mellet
Xavier Garbet
Patrick Maget
Hinrich Lütjens
Dmytro Meshcheriakov
Institut de Recherche sur la Fusion par confinement Magnétique (IRFM)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Centre de Physique Théorique [Palaiseau] (CPHT)
Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)
École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)
Source :
Physics of Plasmas, Physics of Plasmas, American Institute of Physics, 2013, 20 (11), pp.112504. ⟨10.1063/1.4829038⟩, Physics of Plasmas, 2013, 20 (11), pp.112504. ⟨10.1063/1.4829038⟩
Publication Year :
2013
Publisher :
HAL CCSD, 2013.

Abstract

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.

Details

Language :
English
ISSN :
1070664X and 10897674
Database :
OpenAIRE
Journal :
Physics of Plasmas, Physics of Plasmas, American Institute of Physics, 2013, 20 (11), pp.112504. ⟨10.1063/1.4829038⟩, Physics of Plasmas, 2013, 20 (11), pp.112504. ⟨10.1063/1.4829038⟩
Accession number :
edsair.doi.dedup.....4e5d8d2556ebaead9abb5c49e2bb1428
Full Text :
https://doi.org/10.1063/1.4829038⟩