Self-consistent gyrokinetic modeling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas

Abstract

The effect of toroidal rotation on both turbulent and neoclassical transport tungsten (W) in tokamaks is investigated using the flux-driven, global, nonlinear 5D gyrokinetic code GYSELA. Nonlinear simulations are carried out with different levels momentum injection that drive W into supersonic regime, while velocity main ions remains subsonic regime. numerical demonstrate induces centrifugal forces cause to accumulate outboard region, generating an in–out poloidal asymmetry. This asymmetry enhances inward convection, which can lead central accumulation cases strong plasma rotation. core mainly driven by convection. However, as continues, roto-diffusion, proportional radial gradient velocity, becomes significant generates outward flux case ion temperature turbulence. Overall, results from GYSELA qualitative agreement theoretical predictions for impurity transport.

Publication
Physics of Plasmas