Gyrokinetic simulations of electrostatic drift modes with statistic neoclassical islands

Statistic neoclassical islands have been added to he gyrokinetic toroidal code (GTC). And the influence of neoclassical islands on the stability of electrostatic drift modes is studied in toroidal geometry. The main effect of islands on equilibrium is the modification on the density and temperature gradients, which induces the new equilibrium particle distribution function. Linear and nonlinear gyrokinetic simulations are used to clarify the influence of the new equilibrium on electrostatic drift modes.