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The sawtooth instability is one of the most fundamental dynamics of an inductive tokamak discharge such as will occur in ITER [R. Aymar et al., Plasma Phys. Controlled Fusion 44, 519 (2002)]. Sawtooth behavior is complex and remains incompletely explained. The Center for Extended MHD Modeling (CEMM) SciDAC project has undertaken an ambitious campaign to model this periodic motion in a small tokamak as accurately as possible using the extended MHD model. Both M3D [W. Park et al., Phys. Plasmas 6, 1796 (1999)] and NIMROD [C. R. Sovinec et al., Phys. Plasmas 10, 1727 (2003)] have been applied to this problem. Preliminary nonlinear MHD results show pronounced stochasticity in the magnetic field following the sawtooth crash but are not yet fully converged. Compared to the MHD model, extended MHD predicts plasma rotation, faster reconnection, and reduced field line stochasticity in the crash aftermath. The multiple time and space scales associated with the reconnection layer and growth time make this an extremely challenging computational problem. However, these calculations are providing useful guidelines to the numerical and physical requirements for more rigorous future studies.
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| Authors: |
Breslau, J. A.;
Jardin, S. C.;
Park, W. [Plasma Physics Laboratory, SciDAC Center for Extended MHD Modeling (CEMM), Princeton University, P.O. Box 451, Princeton, New Jersey 08543 (United States)]
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| Publication Date: | 2007 May 15 |
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| OSTI Identifier: | 20975044 |
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| Resource Type: | Journal Article |
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| Resource Relation: | Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2695868; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA) |
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| Country of Publication: | United States |
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| Language: | English |
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| Format: | Size: page(s) 056105-056105.7 |
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| Other Number(s): | Journal ID: ISSN 1070-664X; PHPAEN; TRN: US07A9375004525 |
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| Subject: | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ITER TOKAMAK; MAGNETIC FIELDS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; NONLINEAR PROBLEMS; PERIODICITY; PLASMA; PLASMA CONFINEMENT; PLASMA INSTABILITY; PLASMA SIMULATION; ROTATION; SAWTOOTH OSCILLATIONS; STOCHASTIC PROCESSES; THREE-DIMENSIONAL CALCULATIONS |
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| Update Date: | 2010 Jun 03 |
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