Nonlinear Stability of Drift Wave in a Sheared Magnetic Field

Abstract

A nonlinear eigenvalue equation for drift wave in a sheared magnetic field is derived by summing the most secular terms of nonlinear electron response. Restricting ourselves to the case where the wave is monochromatic and its amplitude is small, we numerically investigated amplitude dependence of the eigen-frequency. The drift wave is found to be destabilized as the fluctuation amplitude increases.