Island divertor experiments on the Wendelstein 7-AS stellarator

McCormick, K.; Grigull, P.; Burhenn, R.; Brakel, R.; Ehmler, H.; Feng, Y.; Fischer, R.; Gadelmeier, F.; Giannone, L.; Hildebrandt, D.; Hirsch, M.; Holzhauer, E.; Jaenicke, R.; Kisslinger, J.; Klinger, T.; Klose, S.; Knauer, J. P.; König, R.; Kühner, G.; Laqua, H. P.; Naujoks, D.; Niedermeyer, H.; Pasch, E.; Narayanan, R.; Rust, N.; Sardei, F.; Wagner, F.; Weller, A.; Wenzel, U.; Werner, A.

doi:10.1016/S0022-3115(02)01506-4

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Island divertor experiments on the Wendelstein 7-AS stellarator

MPS-Authors

/persons/resource/persons109914

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;

/persons/resource/persons109226

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

/persons/resource/persons108825

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

/persons/resource/persons108767

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

/persons/resource/persons109011

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;

/persons/resource/persons109074

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;

/persons/resource/persons109090

Fischer, R.
Centre for Interdisciplinary Plasma Science (CIPS), Max Planck Institute for Plasma Physics, Max Planck Society;
Surface Science (OP), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109170

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

/persons/resource/persons109390

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

/persons/resource/persons109397

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

/persons/resource/persons109491

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;

/persons/resource/persons109609

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

/persons/resource/persons109625

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;

/persons/resource/persons109629

Klose, S.
Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society;
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons109653

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

/persons/resource/persons109723

Kühner, G.
Computer Center Garching (RZG), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110035

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

/persons/resource/persons110054

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

/persons/resource/persons110111

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

/persons/resource/persons110034

Narayanan, R.
Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110298

Rust, N.
W7-X: Heating (HT), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110320

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

/persons/resource/persons110725

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

/persons/resource/persons110770

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

/persons/resource/persons110778

Wenzel, U.
Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society;

/persons/resource/persons110781

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

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Citation

McCormick, K., Grigull, P., Burhenn, R., Brakel, R., Ehmler, H., Feng, Y., et al. (2003). Island divertor experiments on the Wendelstein 7-AS stellarator. Journal of Nuclear Materials, 1131-1140. doi:10.1016/S0022-3115(02)01506-4.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-2361-1

Abstract

A promising new operational regime on the Wendelstein stellarator W7-AS has been discovered, fulfilling the conditions of optimal core behavior in combination with edge parameters suitable for successful divertor scenarios. This regime, the high density H-mode (HDH), displays no systematically evident mode activity, and is edge localized mode (ELM)-free. It is extant above a power-dependent 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-stationary discharges with line-averaged densities n_e to 4×10²⁰ m⁻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 predicted by a conventional scaling. HDH has been attained for both H⁺ and D⁺ plasmas. The development of plasma energy as a function of density shows an isotopic dependence.