The effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas
arXiv:1708.04031 · doi:10.1063/1.5006554
Abstract
We propose a phenomenological yet very general model in a form of generalized complex Ginzburg-Landau equation to understand the dynamics of the quasi-periodic fluid instabilities (called edge-localized modes) in the boundary of toroidal magnetized high-temperature plasmas. The model reproduces key dynamical features of the boundary instabilities observed in the high-confinement state plasmas on the KSTAR tokamak, including quasi-steady states characterized by field-aligned filamentary eigenmodes, transitions between different 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 the observed dynamical features.
References in corpus (4)
- Nonlinear excitation of low-n harmonics in reduced magnetohydrodynamic simulations of edge-localized modes
- Solitary magnetic perturbations at the ELM onset
- Explosive Instability and Erupting Flux Tubes in a Magnetised Plasma Atmosphere
- Mathematical analysis of long-time behavior of magnetized fluid instabilities with shear flow