학술논문
MHD (magnetohydrodynamic) modes driven by anomalous electron viscosity and their role in fast sawtooth crashes
Document Type
Technical Report
Author
Source
Subject
Language
English
Abstract
We derive the dispersion relations for both small and large-{Delta}{prime} modes (m {ge} 2, and m = 1 modes, respectively) driven by anomalous electron viscosity. Under the assumption that the anomalous kinematic electron viscosity is comparable to the anomalous electron thermal diffusivity, we find that the viscous mode typically has a higher growth rate than the corresponding resistive mode. We compare computational results in cylindrical and toroidal geometries with theory and present some nonlinear results for viscous m = 1 modes in both circular and D-shaped boundaries and discuss their possible rile in fast sawtooth crashes. 30 ref., 5 figs., 1 tab.