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Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas

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Title
Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas
Author
Oh, YoungminHwang, Hyung JuLeconte, MichaelKim, MinwooYun, Gunsu S.
Issue Date
201802
Publisher
AMER INST PHYSICS
Citation
AIP ADVANCES, v.8, no.2, pp.025224 -
Abstract
We propose a phenomenological yet general model in a form of extended complex Ginzburg-Landau equation to understand edge-localized modes (ELMs), a class of quasi-periodic fluid instabilities in the boundary of toroidal magnetized high-temperature plasmas. The model reproduces key dynamical features of the ELMs (except the final explosive relaxation stage) observed in the high-confinement state plasmas on the Korea Superconducting Tokamak Advanced Research: quasi-steady states characterized by field-aligned filamentary eigenmodes, transitions between different quasi-steady eigenmodes, and rapid transition to non-modal filamentary structure prior to the relaxation. It is found that the inclusion of time-varying perpendicular sheared flow is crucial for reproducing all of the observed dynamical features.
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DOI
http://dx.doi.org/10.1063/1.5006554
ISSN
2158-3226
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