Plasma and Fusion Research

Volume 17, 1203077 (2022)

Rapid Communications

Impact of Geodesic Curvature on Zonal Flow Generation in Magnetically Confined Plasmas
Motoki NAKATA1,2,3) and Seikichi MATSUOKA1,2)
1)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
2)
The Graduate University for Advanced Studies, Toki 509-5292, Japan
3)
PRESTO, Japan Science and Technology Agency, 418 Honcho, Kawaguchishi, Saitama 332-0012, Japan
(Received 14 April 2022 / Accepted 8 May 2022 / Published 22 June 2022)

Abstract

The impact of magnetic geometry on zonal-flow generation in ion temperature gradient driven turbulence is investigated by means of linear and nonlinear gyrokinetic simulations. The modulation of geodesic curvature on various configurations has revealed amplification of the zonal-flow intensity in relatively smaller geodesic curvature. Based on these findings, a nonlinear proxy model for explorations of novel magnetic geometry to activate the zonal-flow dynamics is proposed.

Keywords

magnetic geometry, geodesic curvature, zonal flow, plasma turbulence, gyrokinetic simulation

DOI: 10.1585/pfr.17.1203077

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