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Simulation des plasmas de tokamak avec XTOR : régimes des dents de scie et évolution vers une modélisation cinétique des ions.

Abstract : We present a numerical study of sawtooth in ohmic tokamak plasmas with the XTOR-2F code. This study is, to our knowledge, the first to explore the long-term dynamics of the internal kink. Resistive MHD gives two regimes : stable oscillations or a saturated helicoidal state. Stabilizing diamagnetic drifts enable us to find sawteeth for pertinent experimental parameters. We also present the contributions made for the transition of the code toward the hybrid MHD-kinetic code XTOR-K, to include both kinetic and fluid effects. We chose a full-f, full-orbit kinetic model, coupled to the fluid part through a Newton-Krylov/Picard algorithm which is stable for the fundamental MHD modes. Orbit integration is done by the Boris algorithm, adapted in toroidal geometry. Invariants of motion do not accumulate numerically. Several methods, including a numerical temporal filter, are considered to reduce the noise on the particular pressure tensor.
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https://pastel.archives-ouvertes.fr/pastel-00618453
Contributor : David Leblond <>
Submitted on : Thursday, September 1, 2011 - 7:08:00 PM
Last modification on : Friday, October 23, 2020 - 4:41:41 PM
Long-term archiving on: : Friday, December 2, 2011 - 2:37:29 AM

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Leblond David. Simulation des plasmas de tokamak avec XTOR : régimes des dents de scie et évolution vers une modélisation cinétique des ions.. Physique des plasmas [physics.plasm-ph]. Ecole Polytechnique X, 2011. Français. ⟨pastel-00618453⟩

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