A study of saturated magnetic island equilibria on the basis of the resistivemagneto-hydro-dynamic model is presented. A bifurcation in the sequence ofequilibria is found as the ratio of the width of the current layer in the initial(non-reconnected) configuration over the island periodicity length reaches acritical threshold. Below this threshold, spontaneous generation of zonal flowsoccurs. This result is suggestive of a possible evolution of current sheets inmagnetically confined plasmas and may be relevant to the understanding ofthe suppression of drift-wave turbulence and the formation of internal transportbarriers in tokamak experiments.
Magnetic islands and spontaneous generation of zonal flows
D Grasso;
2006
Abstract
A study of saturated magnetic island equilibria on the basis of the resistivemagneto-hydro-dynamic model is presented. A bifurcation in the sequence ofequilibria is found as the ratio of the width of the current layer in the initial(non-reconnected) configuration over the island periodicity length reaches acritical threshold. Below this threshold, spontaneous generation of zonal flowsoccurs. This result is suggestive of a possible evolution of current sheets inmagnetically confined plasmas and may be relevant to the understanding ofthe suppression of drift-wave turbulence and the formation of internal transportbarriers in tokamak experiments.| File | Dimensione | Formato | |
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