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Updated: Jun 8, 2026

The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
On the validity of the local diffusive paradigm in turbulent plasma transport
G Dif-Pradalier1, P H Diamond, V Grandgirard
1Center for Astrophysics and Space Sciences, UCSD, La Jolla, CA 92093, USA. gdifpradalier@ucsd.edu
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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