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On the validity of the local diffusive paradigm in turbulent plasma transport

Abstract : 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.
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Submitted on : Wednesday, February 15, 2017 - 1:48:17 PM
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Guilhem Dif-Pradalier, P.H Diamond, Virginie Grandgirard, Yanick Sarazin, C Abiteboul, et al.. On the validity of the local diffusive paradigm in turbulent plasma transport. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2010, 82, pp.025401. ⟨10.1103/PhysRevE.82.025401⟩. ⟨cea-01468369⟩



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