Impact of Toroidal Rotation on Ion Turbulent Transport in Tokamaks

Full text: An impact of toroidal rotation on avalanche-like heat transport and momentum transport in the ion temperature gradient driven (ITG) turbulence is studied in rotation scan numerical experiments using a gyrokinetic full-f Vlasov simulation GT5D. It is found that indirect influences of toroidal rotation through the mean radial electric field Er, which is connected to parallel flows by a neoclassical force balance relation, significantly affect avalanche-like or non-local heat transport, and show asymmetric effects between co- and counter-current rotation due to a cancellation of parallel flow shear and profile shear effects. Momentum transport is analyzed for different rotation profiles, and an effective Prandtl number is estimated. The results show non-diffusive momentum transport due to Er shear stress. (author)