A Fully Noninductive, ELM-Suppressed Scenario for ITER

An attractive regime with beta, collisionality and plasma shape relevant to the ITER steady-state mission has been attained in DIII-D using the hybrid scenario, including complete ELM suppression using resonant magnetic perturbation (RMP) coils. Fully noninductive hybrids with simultaneous high beta ($\beta_N\leq3.1)$ and high confinement ($H_{98y2}\leq1.4)$ have achieved zero surface loop voltage for up to two current relaxation times using efficient central current drive from ECCD and NBCD. This steady-state regime has been successfully integrated with ELM suppression by applying an odd parity n=3 RMP, which has only a minor impact on the pedestal pressure $(\sim{{15}\%})$ and $H_{98y2}$ $(\sim{{10}\%})$ In radiating divertor experiments in hybrids, the combination of Argon seeding and strong Deuterium puffing more than doubles the plasma radiative power, up to 55$\%$ of the input power, with less than 10$\%$ increase in $Z_{eff}$. IR camera measurements find that the peak heat flux in the upper, outer divertor falls by a factor of 2 (from 4.6 to 2.3 $MW/m^2$).