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A promising new plasma operational regime on the Wendelstein stellarator W7-AS has been discovered. It 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 is avoided. Quasistationary discharges with line-averaged densities n₄ to 410^20m^-3, radiation levels to 90%, and partial plasma detachment at the divertor target plates can be simultaneously realized. Energy confinement is up to twice that of a standard scaling. At Bₓ0ex{0ex}=0ex{0ex}0. 9T, an average value of 3. 1% is achieved. The high n₄ values allow demonstration of electron Bernstein wave heating using linear mode conversion.
McCormick et al. (Tue,) studied this question.