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Suppression of turbulence in the drift-resistive plasma where zonal flow changes direction

Part of: Focus on Fusion

Published online by Cambridge University Press:  11 June 2020

Chang-Bae Kim Open the ORCID record for Chang-Bae Kim [Opens in a new window]
Chang-Bae Kim*
Affiliation:
Physics Department and Research Institute for Origin of Matter and Evolution of Galaxies, Soongsil University, Seoul06978, Korea
*
†Email address for correspondence: cbkim@ssu.ac.kr
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Abstract

The edge region of quasi-adiabatic plasma is pedagogically simulated by the dynamics between the electric potential $\unicode[STIX]{x1D711}$ and the electron density $n$ whose equilibrium density gradient is negative and held fixed. The zonal flow (ZF) $V$ is either enforced sinusoidally or generated self-consistently from the turbulence. Cross-phase $\unicode[STIX]{x1D6FF}$ between $\unicode[STIX]{x1D711}$ and $n$, which is important in the determination of the turbulence level and the transport, is strongly influenced by the ZF. In the region near $V=0$, $\unicode[STIX]{x1D6FF}$ becomes negative due to the large gradient of the ZF. It is found that the instabilities are quenched there, and the fluctuations decay. The ZF thus works as a transport barrier in the region where the ZF changes direction with large gradient.

Keywords

fusion plasmaplasma nonlinear phenomena
Type
Research Article
Information
Journal of Plasma Physics , Volume 86 , Issue 3 , June 2020 , 905860315
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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