Intermediate non-Gaussian transport in plasma core turbulence

Test particle transport in realistic plasma core turbulence (as described by nonlinear gyrokinetics) is investigated, focusing on the question whether and under what conditions the transport may become “anomalous”; i.e. super- or subdiffusive. While in the presence of stochastic fluctuations, the tr...

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Bibliographic Details
Published in:Physics of plasmas 2007-10, Vol.14 (10), p.102316-102316-8
Main Authors: Hauff, T., Jenko, F., Eule, S.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPLEMENT
FLUCTUATIONS
FOCUSING
NONLINEAR PROBLEMS
PLASMA
PLASMA SIMULATION
STOCHASTIC PROCESSES
TEST PARTICLES
TURBULENCE
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Summary:Test particle transport in realistic plasma core turbulence (as described by nonlinear gyrokinetics) is investigated, focusing on the question whether and under what conditions the transport may become “anomalous”; i.e. super- or subdiffusive. While in the presence of stochastic fluctuations, the transport always becomes diffusive for large times, coherent flow components such as zonal flows or poloidal drifts can induce non-Gaussian transport over large intermediate time spans. In order to understand the origin of these phenomena, a simple model employing stochastic potentials is used to complement the analysis based on gyrokinetic turbulence simulations.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2794322