Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas
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- Effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas
- Oh, Youngmin; Hwang, Hyung Ju; Leconte, Michael; Kim, Minwoo; Yun, Gunsu S.
- Issue Date
- AMER INST PHYSICS
- AIP ADVANCES, v.8, no.2, pp.025224
- 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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