Chen, C-C, Diamond, PH, Singh, R et al. (1 more author) (2021) Potential Vorticity Transport in Weakly and Strongly Magnetized Plasmas. Physics of Plasmas, 28 (4). 042301. ISSN 1070-664X
Abstract
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 β-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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 Author(s). Published under license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Chang-Chun Chen, Patrick H. Diamond, Rameswar Singh, and Steven M. Tobias , "Potential vorticity transport in weakly and strongly magnetized plasmas", Physics of Plasmas 28, 042301 (2021) and may be found at (https://doi.org/10.1063/5.0041072). Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 18 Mar 2021 09:52 |
Last Modified: | 07 Aug 2021 03:42 |
Status: | Published |
Publisher: | American Institute of Physics |
Identification Number: | 10.1063/5.0041072 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:172269 |