Role of Neutrals in Core Fueling and Pedestal Structure in H-Mode DIII-D Discharges

摘要

The 2-D fluid code UEDGE was used to analyze DIII-D experiments to determine the role of neutrals in core fueling, core impurities, and also the H-mode pedestal structure. We compared the effects of divertor closure on the fueling rate and impurity density of high-triangularity, H-mode plasmas. UEDGE simulations indicate that the decrease in both deuterium core fueling and care carbon density with the closed divertor compared to the open divertor configuation is due to greater divertor screening of neutrals.