Nonlinear Quenching of Diamagnetic and Gyroviscous Effects in Tearing Modes

摘要

The nonlinear behavior of the drift-tearing instability is investigated within the two fluid theory. It is shown analytically and verified in numerical computations that the diamagnetic effects and ion gyroviscosity which determine the frequency of the linear mode are quenched at magnetic island size of the order of the resitive layer width. For finite island width, growth and saturation of the mode depend only on resistivity and current profile, while its frequency is determined by the rotation of the plasma. (Atomindex citation 10:424465)