Role of the zonal flow in multi-scale multi-mode turbulence with small-scale shear flow in tokamak plasmas

doi:10.1088/1674-1056/ac6011

Abstract The structural characteristics of zonal flows and their roles in the nonlinear interaction of multi-scale multi-mode turbulence are investigated numerically via a self-consistent Landau-fluid model. The multi-mode turbulence here is composed of a shorter wavelength electromagnetic (EM) ion temperature gradient (ITG) mode and a Kelvin-Helmholtz (KH) instability with long wavelengths excited by externally imposed small-scale shear flows. For strong shear flow, a prominent periodic intermittency of fluctuation intensity except for dominant ITG component is revealed in turbulence evolution, which onset time depends on the ion temperature gradient and the shear flow amplitudes corresponding to different KH instabilities. It is identified that the intermittency phenomenon results from the zonal flow dynamics, which is mainly generated by the KH mode and back-reacts on it. It is demonstrated that the odd symmetric components of zonal flow (same symmetry as the external flow) make the radial parity of the KH mode alteration through adjusting the drift velocities at two sides of the resonant surface so that the KH mode becomes bursty first. Afterwards, the ITG intermittency follows due to nonlinear mode coupling. Parametric dependences of the features of the intermittency are elaborated. Finally, associated turbulent heat transport is evaluated.

Keywords: drift waves turbulence nonlinear phenomena plasma simulation

Received: 23 December 2021
Revised: 14 March 2022
Accepted manuscript online: 23 March 2022

PACS:	52.35.Kt	(Drift waves)
	52.35.Ra	(Plasma turbulence)
	52.35.Mw	(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
	52.65.-y	(Plasma simulation)

Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFE0301200 and 2017YFE0301201), partially by the National Natural Science Foundation of China (Grant Nos. 11775069 and 11925501), and the Liaoning Revitalization Talents Program (Grant No. XLYC1802009).

Corresponding Authors: Jiquan Li, Zhengxiong Wang
E-mail: lijq@swip.ac.cn;zxwang@dlut.edu.cn

Cite this article:

Hui Li(李慧), Jiquan Li(李继全), Zhengxiong Wang(王正汹), Lai Wei(魏来), and Zhaoqing Hu(胡朝清) Role of the zonal flow in multi-scale multi-mode turbulence with small-scale shear flow in tokamak plasmas 2022 Chin. Phys. B 31 065207

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Role of the zonal flow in multi-scale multi-mode turbulence with small-scale shear flow in tokamak plasmas

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