Dynamics of seed magnetic island formation due to geometrically coupled perturbations
- 1 January 1999
- journal article
- Published by AIP Publishing in Physics of Plasmas
- Vol. 6 (1) , 130-136
- https://doi.org/10.1063/1.873265
Abstract
Seed magnetic island formation due to a dynamically growing external source in toroidal confinement devices is modeled as an initial value, forced reconnection problem. For an external source whose amplitude grows on a time scale quickly compared to the Sweet–Parker time of resistive magnetohydrodynamics, the induced reconnection is characterized by a current sheet and a reconnected flux amplitude that lags in time the source amplitude. This suggests that neoclassical tearing modes, whose excitation requires a seed magnetic island, are more difficult to cause in high Lundquist number plasmas.Keywords
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