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

  • Author(s): Dif-Pradalier, G
  • Diamond, PH
  • Grandgirard, V
  • Sarazin, Y
  • Abiteboul, J
  • Garbet, X
  • Ghendrih, Ph
  • Strugarek, A
  • Ku, S
  • Chang, CS
  • et al.

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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