Plasma and Fusion Research
Volume 5, 031 (2010)
Rapid Communications
- Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan
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.
Keywords
multiscale interaction, direct simulation, microturbulence, MHD, dynamo, magnetic island
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This paper may be cited as follows:
Jiquan LI and Yasuaki KISHIMOTO, Plasma Fusion Res. 5, 031 (2010).