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Self-consistent model of electron drift mode turbulence

Published online by Cambridge University Press:  01 February 2008

ZHANNA N. ANDRUSHCHENKO
Affiliation:
Swedish University of Agricultural Sciences, SE-750 07 Uppsala, Sweden
MARTIN JUCKER
Affiliation:
École Polytechnique Fédérale de Lausanne, Association EURATOM-Confédération Suisse, CH-1015 Lausanne, Switzerland
VLADIMIR P. PAVLENKO
Affiliation:
Uppsala University and EURATOM-VR Fusion Association, SE-751 20 Uppsala, Sweden (vladimir.pavlenko@astro.uu.se)

Abstract

The nonlinear dynamics of magnetic electron drift mode turbulence are outlined and the generation of large-scale magnetic structures in a non-uniform magnetized plasma by turbulent Reynolds stress is demonstrated. The loop-back of large-scale flows on the microturbulence is elucidated and the modulation of the electron drift mode turbulence spectrum in a medium with slowly varying parameters is presented. The wave kinetic equation in the presence of large-scale flows is derived and it can be seen that the small-scale turbulence and the large-scale structures form a self-regulating system. Finally, it is shown by the use of quasilinear theory that the shearing of microturbulence by the flows can be described by a diffusion equation in k-space and the corresponding diffusion coefficients are calculated.

Type
Papers
Copyright
Copyright © Cambridge University Press 2007

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