  Gyrokinetic simulations in the collisionless limit demonstrate the physical
mechanisms and the amplitude of the current driven by turbulence. Simulation
results show the spatio-temporal variation of the turbulence driven current and
its connection to the divergence of the Reynolds stress and the turbulence
acceleration. Fine structures (a few ion Larmor radii) of the turbulence
induced current are observed near the rational surfaces with the arbitrary
wavelength solver of the quasi-neutrality equation. The divergence of the
Reynolds stress plays a major role in the generation of these fine structures.
The so-called "spontaneous" current is featured with large local magnitude near
the rational surfaces.
