dorsal/arxiv
View SchemaTwo-fluid magnetic island dynamics in slab geometry: II - Islands interacting with resistive walls or static external resonant magnetic perturbations
| Authors | Richard Fitzpatrick, Francois L Waelbroeck |
|---|---|
| Categories | |
| ArXiv ID | physics/0406133 |
| URL | https://arxiv.org/abs/physics/0406133 |
| DOI | 10.1063/1.1833391 |
Abstract
The dynamics of a propagating magnetic island interacting with a resistive wall or a static external magnetic perturbation is investigated using two-fluid, drift-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 separate 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 completely unaffected by 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. Finally, there is a hybrid of the other two polarization terms. The sign of this term depends on many factors. However, under normal conditions, it is stabilizing if the unperturbed island propagates in the ion diamagnetic direction (in the lab. frame), and destabilizing if it propagates in the electron diamagnetic direction.
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"abstract": "The dynamics of a propagating magnetic island interacting with a resistive\nwall or a static external magnetic perturbation is investigated using\ntwo-fluid, drift-MHD theory in slab geometry. In both cases, the island\nequation of motion is found to take exactly the same form as that predicted by\nsingle-fluid MHD theory. Three separate ion polarization terms are found in the\nRutherford island width evolution equation. The first is the drift-MHD\npolarization term for an isolated island, and is completely unaffected by\ninteraction with a wall or magnetic perturbation. Next, there is the\npolarization term due to interaction with a wall or magnetic perturbation which\nis predicted by single-fluid MHD theory. Finally, there is a hybrid of the\nother two polarization terms. The sign of this term depends on many factors.\nHowever, under normal conditions, it is stabilizing if the unperturbed island\npropagates in the ion diamagnetic direction (in the lab. frame), and\ndestabilizing if it propagates in the electron diamagnetic direction.",
"arxiv_id": "physics/0406133",
"authors": [
"Richard Fitzpatrick",
"Francois L Waelbroeck"
],
"categories": [
"physics.plasm-ph"
],
"doi": "10.1063/1.1833391",
"title": "Two-fluid magnetic island dynamics in slab geometry: II - Islands interacting with resistive walls or static external resonant magnetic perturbations",
"url": "https://arxiv.org/abs/physics/0406133"
},
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