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Cross-scale Dynamo Action in Multiscale Plasma Turbulence

Jiquan LI and Yasuaki KISHIMOTO

Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan

(Received 12 July 2010 / Accepted 20 July 2010 / Published 27 August 2010)

Abstract

The interplay mechanism between electromagnetic (EM) and electrostatic (ES) turbulence is explored using direct gyrofluid simulations of mixed resistive magnetohydrodynamic (MHD) and ion-scale microinstability. With an elucidation based on a minimal model, we propose a new concept of cross-scale dynamo action induced by microturbulence as the mechanism responsible for the interaction between multiscale ES and EM turbulence. The dynamo appears as a novel magnetic island seesaw oscillation pivoting around the singular surface. This island seesaw mechanism may be applicable to relaxation of mode locking in tokamaks to mitigate major disruptions, suggesting a promising nonlinear approach to plasma control.

Copyright (c) 2010 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

multiscale interaction, direct simulation, microturbulence, MHD, dynamo, magnetic island

DOI: 10.1585/pfr.5.031

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This paper may be cited as follows:

Jiquan LI and Yasuaki KISHIMOTO, Plasma Fusion Res. 5, 031 (2010).