Characterization of the radiated power operational space in negative triangularity plasmas at DIII-D

We report on the first experiments and related edge modeling performed to assess the integration of core performance with power exhaust in diverted negative triangularity plasmas. A database with a wide parameter range in terms of radiated fraction, Greenwald fraction, power, density, and current has been collected, indicating a core radiated power fraction up to 0.85 obtained through the injecting of mantle radiators such as Kr, Ar, Ne. Kr-seeded discharges exhibit an increase in β_N with increases in both radiation fraction and Greenwald fraction, while Ne seeding leads to a reduction of β_N for f_rad > 0.5. Scoping studies with SOLPS-ITER modeling guided the location choice of seeding during the experiments, and interpretive SOLPS-ITER modeling with multiple impurity species will be presented showing the effects of the experimental scanned parameters, edge impurity transport, and divertor characteristics.