Diamagnetic thresholds for sawtooth cycling in tokamak plasmas

Federico D. Halpern; Hinrich Lütjens; Jean François Luciani

doi:10.1063/1.3646305

Diamagnetic thresholds for sawtooth cycling in tokamak plasmas

Federico D. Halpern
, Hinrich Lütjens
, Jean François Luciani

CNRS

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

Abstract

The cycling dynamics of the internal kink mode, which drives sawtooth oscillations in tokamak plasmas, is studied using the three dimensional, non-linear magnetohydrodynamic (MHD) code XTOR-2F H. Ltjens and J.-F. Luciani, J. Comput. Phys. 229, 8130 (2010). It is found that sawtooth cycling, which is characterized by quiescent ramps and fast crashes in the experiment, can be recovered in two-fluid MHD provided that a criterion of diamagnetic stabilization is fulfilled. The simulation results indicate that diamagnetic effects alone may be sufficient to drive sawteeth with complete magnetic reconnection in high temperature Ohmic plasmas.

Original language	English
Article number	102501
Journal	Physics of Plasmas
Volume	18
Issue number	10
DOIs	https://doi.org/10.1063/1.3646305
Publication status	Published - 1 Jan 2011

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title = "Diamagnetic thresholds for sawtooth cycling in tokamak plasmas",

abstract = "The cycling dynamics of the internal kink mode, which drives sawtooth oscillations in tokamak plasmas, is studied using the three dimensional, non-linear magnetohydrodynamic (MHD) code XTOR-2F H. Ltjens and J.-F. Luciani, J. Comput. Phys. 229, 8130 (2010). It is found that sawtooth cycling, which is characterized by quiescent ramps and fast crashes in the experiment, can be recovered in two-fluid MHD provided that a criterion of diamagnetic stabilization is fulfilled. The simulation results indicate that diamagnetic effects alone may be sufficient to drive sawteeth with complete magnetic reconnection in high temperature Ohmic plasmas.",

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AU - Halpern, Federico D.

AU - Lütjens, Hinrich

AU - Luciani, Jean François

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AB - The cycling dynamics of the internal kink mode, which drives sawtooth oscillations in tokamak plasmas, is studied using the three dimensional, non-linear magnetohydrodynamic (MHD) code XTOR-2F H. Ltjens and J.-F. Luciani, J. Comput. Phys. 229, 8130 (2010). It is found that sawtooth cycling, which is characterized by quiescent ramps and fast crashes in the experiment, can be recovered in two-fluid MHD provided that a criterion of diamagnetic stabilization is fulfilled. The simulation results indicate that diamagnetic effects alone may be sufficient to drive sawteeth with complete magnetic reconnection in high temperature Ohmic plasmas.

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Diamagnetic thresholds for sawtooth cycling in tokamak plasmas

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