Diamagnetic thresholds for sawtooth cycling in tokamak plasmas

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. Lütjens 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.


Published in:
Physics of Plasmas, 18, 10, 102501
Year:
2011
Publisher:
American Institute of Physics
ISSN:
1070-664X
Keywords:
Laboratories:
SPC
CRPP




 Record created 2011-10-25, last modified 2018-01-28

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