Nonlinear gyrokinetic simulation of saturated turbulence produced by fast ion precession driven drift instability in reversed shear plasmas

Highlights: • Fast ion driven drift instability is investigated from nonlinear simulation. • Saturated spectrum suggests ion Compton scattering as nonlinear saturation mechanism. • Transport rate with the level of gyroBohm diffusivity is observed for fast ions. Transport caused by a fast ion precession driven drift instability in reversed shear plasmas Kang and Hahm (2019) [10] is investigated from nonlinear gyrokinetic simulation using the GKW code. Nonlinearly saturated spectrum of fluctuation intensity decays as $k_{\theta }^{-3}$ and considerable transport rate roughly with the level of gyroBohm diffusivity is observed for fast ions.