A study of saturated magnetic island equilibria on the basis of the resistive magneto-hydro-dynamic model is presented. A bifurcation in the sequence of equilibria is found as the ratio of the width of the current layer in the initial (non-reconnected) configuration over the island periodicity length reaches a critical threshold. Below this threshold, spontaneous generation of zonal flows occurs. This result is suggestive of a possible evolution of current sheets in magnetically confined plasmas and may be relevant to the understanding of the suppression of drift-wave turbulence and the formation of internal transport barriers in tokamak experiments.
Magnetic islands and spontaneous generation of zonal flows / GRASSO D.; MARGHERITI L; TEBALDI C; PORCELLI F. - In: PLASMA PHYSICS AND CONTROLLED FUSION. - ISSN 0741-3335. - 48:(2006), pp. L87-L95.
Titolo: | Magnetic islands and spontaneous generation of zonal flows | |
Autori: | ||
Data di pubblicazione: | 2006 | |
Rivista: | ||
Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11583/1524887