We propose a phenomenological yet very general model in a form of generalizedcomplex Ginzburg-Landau equation to understand the dynamics of thequasi-periodic fluid instabilities (called edge-localized modes) in theboundary of toroidal magnetized high-temperature plasmas. The model reproduceskey dynamical features of the boundary instabilities observed in thehigh-confinement state plasmas on the KSTAR tokamak, including quasi-steadystates characterized by field-aligned filamentary eigenmodes, transitionsbetween different eigenmodes, and rapid transition to non-modal filamentarystructure prior to the relaxation. It is found that the inclusion oftime-varying perpendicular sheared flow is crucial for reproducing the observeddynamical features.
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