Small ELM high qmin experiment utilizing stronger shaping with the SVR divertor
2024 Research Campaign, Steady State and Pulsed Fusion Core
Purpose of Experiment
FPP steady-state designs such as CAT-DEMO propose operation at qmin > 2 and q95 ~ 5–6.5, but at higher βN (~3.5–4.5) than has been achieved in high qmin DIII-D plasmas. This experiment aims to utilize the larger machine volume enabled by the recent installation of the Shape and Volume Rise (SVR) stage 1 divertor, wherein predictions allow for high qmin scenario operation at higher values of βN, H-factor, and non-inductive fraction. This stronger shaping is also favorable for achieving small/grassy ELMs, whose character will be assessed during this experiment.