Effects of Collisional Zonal Flow Damping on Turbulent Transport
Z. Lin, T.S. Hahm, W.W. Lee, W.M. Tang, and P.H. Diamond
Date of PPPL Report: October 14, 1999
Results from 3D global gyrokinetic particle simulations of ion temperature gradient driven microturbulence in a toroidal plasma show that the ion thermal transport level in the interior region exhibits significant dependence on the ion-ion collision frequency even in regimes where the instabilities are collisionless. This is identified as arising from the Coulomb collisional damping of turbulence-generated zonal flows.