Potential vorticity transport in weakly and strongly magnetized plasmas

被引：14

作者：

Chen, Chang-Chun ^{[1
]}

Diamond, Patrick H. ^{[1
]}

Singh, Rameswar ^{[1
]}

Tobias, Steven M. ^{[2
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Univ Leeds, Dept Appl Math, Leeds LS2 9JT, W Yorkshire, England

来源：

PHYSICS OF PLASMAS | 2021年 / 28卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/5.0041072

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Tangled magnetic fields, often coexisting with an ordered mean field, have a major impact on turbulence and momentum transport in many plasmas, including those found in the solar tachocline and magnetic confinement devices. We present a novel mean field theory of potential vorticity mixing in beta -plane magnetohydrodynamic (MHD) and drift wave turbulence. Our results show that mean square stochastic fields strongly reduce Reynolds stress coherence. This decoherence of potential vorticity flux due to stochastic field scattering leads to suppression of momentum transport and zonal flow formation. A simple calculation suggests that the breaking of the shear-eddy tilting feedback loop by stochastic fields is the key underlying physics mechanism. A dimensionless parameter that quantifies the increment in power threshold is identified and used to assess the impact of stochastic field on the L-H transition. We discuss a model of stochastic fields as a resisto-elastic network.

引用

页数：12

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