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(THP2/02) Electromagnetic $\eta_{i}^{}$ mode turbulence at the plasma edge

(This paper was rapporteured in lecture TH1/7)

A. Zeiler, K. Hallatschek, D. Biskamp

Max-Planck-Institut für Plasmaphysik, EURATOM Association, 85748 Garching, Germany

J. F. Drake, B. N. Rogers
Institute for Plasma Research, University of Maryland, College Park, MD 20742, USA

Abstract.  Electromagnetic toroidal $\eta_{i}^{}$ mode turbulence is investigated linearly and nonlinearly for parameters typical for the plasma edge. The linear eigenmodes are shifted to longer wavelength while the growth rate remains unchanged, thus a mixing length estimate would predict an increase of the transport rates. Nonlinear simulations, however, exhibit a strong drop of the transport rates, when electromagnetic effects are taken into account. This reduction of the transport rates is associated with a fundamental change in the dominant scale lengths and saturation of the underlying turbulence. Specifically, magnetic reconnection plays a dominant role in the nonlinear evolution. Therefore magnetic fluctuations should generally be included in simulations of $\eta_{i}^{}$ mode turbulence.

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