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A 2-dimensional numerical simulation of interchange instability in the scrape off layer (SOL) has already shown the existence of particle avalanches moving inward and outward. These avalanches result from the onset of long lived and radially extended convective cells. In the present study, we investigate the transport properties of a passive scalar in the presence of such avalanche events. Our statistical analysis shows that the predominant transport which results from interchange instability call be super-diffusive or even ballistic both inwards and outwards. So the large electric convection cells generated by plasma turbulence can lead to strong impurity influx even in regimes where avalanche transport is weak.

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Authors: GRANDGIRARD V, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH);AGULLO O, Equipe de Dynamique des Systemes Complexes, CNRS-Universite de Provence (FR);BENKADDA S, Equipe de Dynamique des Systemes Complexes, CNRS-Universite de Provence (FR);BEIHLER B, Association EURATOM-CEA, DRFC-CEA, Cadarache (FR);GARBET X, Association EURATOM-CEA, DRFC-CEA, Cadarache (FR);GHENDRIH P, Association EURATOM-CEA, DRFC-CEA, Cadarache (FR);SARAZIN Y, Association EURATOM-CEA, DRFC-CEA, Cadarache (FR)
Bibliographic Reference: An article published in: Theory of Fusion Plasmas (2000), pp.427-432
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