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Abstract

In addition to the well known H-mode, other types of discharges with enhanced core energy confinement can be observed in the stellarator W7-AS. In this contribution, the properties of some particular examples of those optimized confinement (OC) discharges are presented. These are characterized, besides improved core energy confinement, by strong radial electric fields and high ion temperatures in the gradient region, steep density profile gradients and a high penetration depth of neutrals, and small edge electron densities. The role of these plasma parameters for the OC discharges is investigated quantitatively by a numerical model.

Additional information

Authors: BALDZUHN J, Max-Plank Institut f³r Plamaphysik, EURATOM Association, Garching bei M³nchen (DE);GIANNONE L, Max-Plank Institut f³r Plamaphysik, EURATOM Association, Garching bei M³nchen (DE);KICK M, Max-Plank Institut f³r Plamaphysik, EURATOM Association, Garching bei M³nchen (DE);MCCORMICK K, Max-Plank Institut f³r Plamaphysik, EURATOM Association, Garching bei M³nchen (DE);W7-AS TEAM, Max-Plank Institut f³r Plamaphysik, EURATOM Association, Garching bei M³nchen (DE)
Bibliographic Reference: Article: Plasma Physical Control and Fusion Vol. 42 (2000) pp. 463-487
Availability: Plasma Physical Control and Fusion (Journal)
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