Simulation of inertial and beam-driven effects on impurities in Tokamak plasmas

Experiments on beam heated Tokamak plasmas in the Impurity Study Experiment (TSX-B) indicate that counterinjection leads to enhanced accumulation of impurities and coinjection leads to reduced accumulation of impurities relative to ohmically heated plasmas. According to neoclassical theory, both inertial and beam driven effects can modify impurity distributions in beam heated plasmas. We have implemented treatments of these effects in our basic impurity transport simulation code, IMPTAR, in order to investigate whether these effects could account for the observations in TSX-B. We briefly review the neoclassical theory of these effects and infer various consequences. We then present simulation results for model coinjected and counterinjected ISX-B plasma with inertial and beam driven effects treated both separately and together.