Nonlinear Dynamics of Magnetic Islands Imbedded in Small-Scale Turbulence

Details Nonlinear Dynamics of Magnetic Islands Imbedded in Small-Scale Turbulence Nonlinear Dynamics of Magnetic Islands Imbedded in Small-Scale Turbulence

2011-03-23

arxiv.org/abs/1103.4443v1

Physical Review Letters 103 (2009) 145001

Physics

Plasma Physics

Scientific paper

10.1103/PhysRevLett.103.145001

The nonlinear dynamics of magnetic tearing islands imbedded in a pressure gradient driven turbulence is investigated numerically in a reduced magnetohydrodynamic model. The study reveals regimes where the linear and nonlinear phases of the tearing instability are controlled by the properties of the pressure gradient. In these regimes, the interplay between the pressure and the magnetic flux determines the dynamics of the saturated state. A secondary instability can occur and strongly modify the magnetic island dynamics by triggering a poloidal rotation. It is shown that the complex nonlinear interaction between the islands and turbulence is nonlocal and involves small scales.

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