Gyrokinetic modelling of light to heavy impurity transport in tokamaks

Abstract

Abstract Impurity transport is numerically investigated for different types of impurity, such as helium (He), argon (Ar), and tungsten (W). Both turbulent neoclassical transports are treated self-consistently using the full- f gyrokinetic software GYSELA. For a light impurity mainly controlled by turbulence, while found to be dominant in case heavy The impact poloidal asymmetry density also studied detail it strong high charge due its Boltzmann-type response. Such might lead core accumulation impurities reducing thermal screening factor transport. two main contributions transport—Pfirsch–Schlüter (PS) flux banana–plateau (BP) flux—are studied. Depending on their mass ( A ) Z ), magnitudes each determined accordingly. Tungsten shows PS compared other impurities, BP argon. An analytical model including effect with numerical simulation good agreement between them.

Publication
Nuclear Fusion