Comparisons of physical and chemical sputtering in high density divertor plasmas with the Monte Carlo Impurity (MCI) transport model

Abstract

AbstractThe MCI transport model was used to compare chemical and physical sputtering for a DIII‐D divertor plasma near detachment. With physical sputtering alone the integrated carbon influx was 8.4 × 1019 neutrals/s while physical plus chemical sputtering produced an integrated carbon influx of 1.7 × 1021 neutrals/s. The average carbon concentration in the computational volume increased from 0.012% with only physical sputtering to 0.182% with both chemical and physical sputtering. This increase in the carbon inventory produced more radiated power which is in better agreement with experimental measurements.