Finite frequency zonal flows in multi-scale plasma turbulence including resistive MHD and drift wave instabilities

Jiquan Li, Y. Kishimoto, Y. Kouduki, Z. X. Wang, M. Janvier

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    The evolution of multi-scale plasma turbulence including resistive MHD and micro-instabilities is studied based on a 5-field slab gyrofluid simulation aiming to understand complex nonlinear interactions and turbulent transport. It is observed that the spatial structure of the mixed-scale electromagnetic turbulence is characterized by a power-law scaling spectrum typical of MHD perturbations, but the spectral amplitude is enhanced by the micro-instability at all scales. A robust oscillatory zonal flow (ZF) with finite frequency is created in slab geometry for the first time due to the multi-scale interaction so that the ion heat transport is not efficiently suppressed. It is identified that the finite frequency ZF results from a net oscillatory electromagnetic torque, which is sustained by micro-instability through multi-scale nonlinear interaction.

    Original languageEnglish
    Article number095007
    Number of pages8
    JournalNuclear Fusion
    Issue number9
    Publication statusPublished - Sep 2009


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