The dynamics of a propagating magnetic island interacting with a resistive wall or an externally generated, resonant magnetic perturbation is investigated using two-fluid, drift-(magnetohydrodynamical) (MHD) theory in slab geometry. In both cases, the island equation of motion is found to take exactly the same form as that predicted by single-fluid MHD theory. Three ion polarization terms are found in the Rutherford island width evolution equation. The first is the drift-MHD polarization term for an isolated island, and is unaffected by the interaction with a wall or magnetic perturbation. Next, there is the polarization term due to interaction with a wall or magnetic perturbation which is predicted by single-fluid MHD theory. This term is always destabilizing. Finally, there is a hybrid of the other two polarization terms. The sign of this term depends on many factors. However, under normal circumstances, it is stabilizing if the noninteracting island propagates in the ion diamagnetic direction (with respect to the wall or magnetic perturbation) and destabilizing if it propagates in the electron diamagnetic direction.
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February 2005
Research Article|
January 12 2005
Two-fluid magnetic island dynamics in slab geometry. II. Islands interacting with resistive walls or resonant magnetic perturbations
Richard Fitzpatrick;
Richard Fitzpatrick
Institute for Fusion Studies, Department of Physics, University of Texas at Austin
, Austin, Texas 78712
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François L. Waelbroeck
François L. Waelbroeck
Institute for Fusion Studies, Department of Physics, University of Texas at Austin
, Austin, Texas 78712
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Phys. Plasmas 12, 022308 (2005)
Article history
Received:
July 19 2004
Accepted:
October 22 2004
Connected Content
A companion article has been published:
Two-fluid magnetic island dynamics in slab geometry. I. Isolated islands
Citation
Richard Fitzpatrick, François L. Waelbroeck; Two-fluid magnetic island dynamics in slab geometry. II. Islands interacting with resistive walls or resonant magnetic perturbations. Phys. Plasmas 1 February 2005; 12 (2): 022308. https://doi.org/10.1063/1.1833391
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