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Strong Nonlinear Effects in the Dynamics of Tearing Modes Controlled by Electron Cyclotron Current Drive

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1 Author(s)
Lazzaro, E. ; Ist. di Fis. del Plasma P. Caldirola, CNR, Milan, Italy

The 2-D time-dependent response of a tearing mode magnetic island to a radio frequency (RF)-driven current may lead to strong nonlinear effects. An extended magnetohydrodynamics model shows first the prompt appearance of current sheets tending to shield the RF current effect and, subsequently, a nonlinear filamentation of the island structure that eventually proceeds in the coalescence of secondary islands.

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Plasma Science, IEEE Transactions on  (Volume:39 ,  Issue: 11 )