POWER BALANCE IN DIII-D DURING SINGLE-NULL ELMING H-MODE PLASMAS

We account for greater than or equal to 85% of the injected power in DIII-D during single-null diverted ELMing H-mode discharges. Core plasma radiation accounts for less than or equal to 18% with the rest flowing through the scrape-off layer to the inboard and outboard divertors. The total power roughly splits in an in:out ratio of 1:1.3, Of the power entering the outboard divertor 75% leaves as direct heat flux to the divertor target plates with the rest in the form of radiation. In the inboard divertor, however, 75% of the power leaves as radiation with the rest as divertor target plate heat flux and charge exchange losses. The in:out ratio remains constant over a range of injected power and plasma current and even as divertor conditions change due to gas puffing.