Nonlinear response of magnetic islands to localized electron cyclotron current injection

D. Borgogno, L. Comisso, D. Grasso, E. Lazzaro

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Abstract

The magnetic island evolution under the action of a current generated externally by electron cyclotron wave beams is studied using a reduced resistive magnetohydrodynamics plasma model. The use of a two-dimensional reconnection model shows novel features of the actual nonlinear evolution as compared to the zero-dimensional model of the generalized Rutherford equation. When the radio frequency control is applied to a small magnetic island, the complete annihilation of the island width is followed by a spatial phase shift of the island, referred as "flip" instability. On the other hand, a current-drive injection in a large nonlinear island can be accompanied by the occurrence of a Kelvin-Helmholtz instability. These effects need to be taken into account in designing tearing mode control systems based on radio frequency current-drive. © 2014 AIP Publishing LLC.
Original languageEnglish
Article number060704
Pages (from-to)-
JournalPhysics of Plasmas
Volume21
Issue number6
DOIs
Publication statusPublished - 2014
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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