Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas
SCIE
SCOPUS
- Title
- Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas
- Authors
- Oh, Youngmin; HWANG, HYUNG JU; Leconte, Michael; Kim, Minwoo; YUN, GUNSU
- Date Issued
- 2018-02
- Publisher
- AIP Publishing
- 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.
- Keywords
- Magnetoplasma; Plasma diagnostics; Plasma stability; Tokamak devices; Complex Ginzburg-Landau equation; Dynamical features; Edge localized modes; Filamentary structures; High-temperature plasmas; Korea superconducting tokamak advanced researches; Non-linear stabilities; Quasi-steady state; Shear flow
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/41176
- DOI
- 10.1063/1.5006554
- ISSN
- 2158-3226
- Article Type
- Article
- Citation
- AIP Advances, vol. 8, no. 2, page. 025224, 2018-02
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- There are no files associated with this item.
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