Wilczynski, F, Hughes, DW orcid.org/0000-0002-8004-8631, Arter, W et al. (1 more author) (2020) Onset of interchange instability in a coupled core–SOL plasma. Physics of Plasmas, 27 (7). 072508. ISSN 1070-664X
Abstract
The dynamics at the edge of fusion confinement devices is driven by interchange instabilities and involves the motion of plasma across two regions—the “core region” and the scrape-off layer (SOL)—distinguished by whether field lines are, respectively, closed or connected to the wall. Motivated by this phenomenon, we present an extensive linear stability analysis of a two-layer plasma model encompassing the coupled interactions between the region with closed field lines and the SOL. We focus on the effect of varying the particle diffusivity and ion viscosity, revealing the significant variation in the spatial structure of the critical modes. In addition, we have investigated the dependence of the stability threshold on the ratio of the width of the region with closed field lines to that of the SOL; this dependence is strong when the ratio is sufficiently small, but becomes insignificant once the ratio is of order unity.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Author(s). This is an author produced version of an article published in Physics of Plasmas. 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: | 22 Jul 2020 11:32 |
Last Modified: | 22 Jul 2020 11:32 |
Status: | Published |
Publisher: | American Institute of Physics |
Identification Number: | 10.1063/5.0010114 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:163564 |