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Oscillation regimes of the internal kink mode in tokamak plasmas

Authors :
Federico David Halpern
D. Leblond
Hinrich Lütjens
Jean-François Luciani
Centre de Physique Théorique [Palaiseau] (CPHT)
Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)
Source :
Plasma Physics and Controlled Fusion, Plasma Physics and Controlled Fusion, IOP Publishing, 2011, 53 (1), pp.015011. ⟨10.1088/0741-3335/53/1/015011⟩
Publication Year :
2011
Publisher :
HAL CCSD, 2011.

Abstract

The long-term dynamics of the internal kink mode are studied using the non-linear, two-fluid magnetohydrodynamics (MHD) code XTOR-2F (Lutjens et al 2010 J. Comput. Phys. 229 8130). The dynamics of the internal kink are studied in resistive MHD plus transport, and, in addition, also including some two-fluid effects. The simulation results yield a pattern of kink cycles or stationary states with m/n = 1/1 helicity. The threshold for sustained (non-decaying) kink cycles, which characterize sawtooth oscillations, is shown to depend on the plasma pressure, the current and energy diffusion times, and the ion and electron diamagnetic drifts. In particular, the diamagnetic flow stabilization extends the cyclic kink regime into a parameter space that is adequate to carry out studies of sawtooth oscillations in ohmic tokamak discharges.

Details

Language :
English
ISSN :
07413335 and 13616587
Database :
OpenAIRE
Journal :
Plasma Physics and Controlled Fusion, Plasma Physics and Controlled Fusion, IOP Publishing, 2011, 53 (1), pp.015011. ⟨10.1088/0741-3335/53/1/015011⟩
Accession number :
edsair.doi.dedup.....d7a05a52a75de82e623796bf4d76994b
Full Text :
https://doi.org/10.1088/0741-3335/53/1/015011⟩