F L Waelbroeck et al 2009 Plasma Phys. Control. Fusion 51 015015 doi:10.1088/0741-3335/51/1/015015
F L Waelbroeck1, F Militello1,2, R Fitzpatrick1 and W Horton1
Show affiliationsA numerical analysis of the interaction of resistive drift wave and interchange turbulence with a magnetic island in a two-dimensional slab is presented. The time-scale for the evolution of the island is assumed to be much longer than that for the turbulence, allowing the use of an electrostatic model. The effects of the turbulence are isolated by choosing the parameters such that only even modes are unstable. This makes it possible to compare turbulent states with quiescent states in which turbulence is suppressed by enforcing odd parity. The turbulence is found to reduce the propagation velocity of the island. Its effect is destabilizing for thin islands but becomes stabilizing for islands greater than a few times the Larmor radius. Analysis of the quiescent solutions reveals the possibility of oscillations of the island amplitude and frequency through hysteretic transitions between bistable states.
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.25.Gj Fluctuation and chaos phenomena
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
Issue 1 (January 2009)
Received 30 July 2008, in final form 27 October 2008
Published 11 December 2008
F L Waelbroeck et al 2009 Plasma Phys. Control. Fusion 51 015015
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