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On the validity of the local diffusive paradigm in turbulent plasma transport.
Dif-Pradalier, G,Diamond, P H,Grandgirard, V,Sarazin, Y,Abiteboul, J,Garbet, X,Ghendrih, Ph,Strugarek, A,Ku, S,Chang, C S Published by the American Physical Society through 2010 Physical review. E, Statistical, nonlinear, and so Vol.82 No.2
<P>A systematic, constructive and self-consistent procedure to quantify nonlocal, nondiffusive action at a distance in plasma turbulence is exposed and applied to turbulent heat fluxes computed from the state-of-the-art full- f, flux-driven gyrokinetic GYSELA and XGC1 codes. A striking commonality is found: heat transport below a dynamically selected mesoscale has the structure of a Lévy distribution, is strongly nonlocal, nondiffusive, scale-free, and avalanche mediated; at larger scales, we report the observation of a self-organized flow structure which we call the ' E × B staircase' after its planetary analog.</P>