Electron Diffusion in Sheared Magnetic Field Due to Electrostatic High n Ballooning Mode

Abstract

The electron diffusion rate due to electrostatic high n ballooning modes in a sheared magnetic field is investigated. The electron motion in a fluctuation having many wave numbers with the same frequency is described by a map. An analytic theory based on a scaling hypothesis for the map is proposed to calculate the diffusion coefficient. The resultant exponent of the diffusion rate is three-halves with respect to the wave amplitude. The result is compared with numerical calculations.