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Effects of the New Island Divertor on the Plasma Performance in the W7-AS Stellarator

MPS-Authors
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Grigull,  P.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

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McCormick,  K.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;

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Burhenn,  R.
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;

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Brakel,  R.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Ehmler,  H.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;

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Feng,  Y.
W7-X: Theory, Max Planck Institute for Plasma Physics, Max Planck Society;
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;

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Giannone,  L.
Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society;

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Hartmann,  D.
Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society;

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Hildebrandt,  D.
Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society;

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Hirsch,  M.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

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Jaenicke,  R.
W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society;
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Kisslinger,  J.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Klinger,  T.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;
VINETA, Max Planck Institute for Plasma Physics, Max Planck Society;

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König,  R.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

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Naujoks,  D.
Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society;

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Niedermeyer,  H.
W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society;

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Pasch,  E.
Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

Ramasubramanian,  N.
Max Planck Society;

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Sardei,  F.
W7-X: Theory, Max Planck Institute for Plasma Physics, Max Planck Society;

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Wagner,  F.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Weller,  A.
Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Grigull, P., McCormick, K., Baldzuhn, J., Burhenn, R., Brakel, R., Ehmler, H., et al. (2003). Effects of the New Island Divertor on the Plasma Performance in the W7-AS Stellarator. In I. Falconer Dewar R.L., & J. Khachan (Eds.), Plasma Physics. 11th International Congress on Plasma Physics: ICPP2002 (pp. 166-169). Melville,NY: American Institute of Physics.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-3DE5-5
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 ñe up to 4 1020 m–3, edge radiation levels up to 90%, and partial plasma detachment at the divertor targets can be simultaneously realized.