Abstract
The island divertor in the W7‐AS stellarator enables access to a new NBI‐heated, high density operating regime with promising confinement properties. This regime — the High Density H‐Mode — displays no evident mode activity, is extant above a threshold density and characterized by flat density profiles, high energy‐ and low impurity‐confinement times and edge localized radiation. Impurity accumulation, normally associated with ELM‐free H‐modes, is avoided. Quasi steady‐state discharges with ne up to 4 1020 m−3, edge radiation levels up to 90%, and partial plasma detachment at the divertor targets can be simultaneously realized.
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