Effects of the New Island Divertor on the Plasma Performance in the W7-AS Stellarator
- Grigull, P.
- McCormick, K.
- Baldzuhn, J.
- Burhenn, R.
- Brakel, R.
- Ehmler, H.
- Feng, Y.
- Gadelmeier, F.
- Giannone, L.
- Hartmann, D.
- Hildebrandt, D.
- Hirsch, M.
- Jaenicke, R.
- Kisslinger, J.
- Klinger, T.
- Knauer, J.
- König, R.
- Naujoks, D.
- Niedermeyer, H.
- Pasch, E.
- Ramasubramanian, N.
- Sardei, F.
- Wagner, F.
- Weller, A.
- W7-AS Team,
DOIAbstract
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 ñ<sub>e</sub> up to 4 10<sup>20</sup> m<sup>–3</sup>, edge radiation levels up to 90%, and partial plasma detachment at the divertor targets can be simultaneously realized
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