Divertor operation in stellarators: results from W7-AS and implications for 
future devices

Grigull, P.; McCormick, K.; Renner, H.; Masuzaki, S.; König, R.; Baldzuhn, J.; Bäumel, S.; 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.; Naujoks, D.; Niedermeyer, H.; Pasch, E.; Ramasubramanian, N.; Sardei, F.; Wagner, F.; Wenzel, U.; Werner, A.; W7-AS Team,

doi:10.1016/S0920-3796(03)00121-2

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Journal Article

Divertor operation in stellarators: results from W7-AS and implications for future devices

MPS-Authors

/persons/resource/persons109226

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

/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/persons110247

Renner, H.
W7-X: Construction, 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/persons108602

Bäumel, S.
Experimental Plasma Physics 3 (E3), 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/persons109170

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

/persons/resource/persons109312

Hartmann, D.
Technology (TE), 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/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;

Ramasubramanian, N.
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/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;

W7-AS Team,
Max Planck Society;

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Citation

Grigull, P., McCormick, K., Renner, H., Masuzaki, S., König, R., Baldzuhn, J., et al. (2003). Divertor operation in stellarators: results from W7-AS and implications for future devices. Fusion Engineering and Design, 66-68, 49-58. doi:10.1016/S0920-3796(03)00121-2.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-2385-2

Abstract

The research on divertors for stellarators is at the beginning. Extensive studies are being prepared on large helical device (LHD) and W7-X. W7-AS is now being operated with an open island divertor (ID) which serves as a test bed for the W7-X divertor. The divertor enables access to a new NBI-heated, high-density operating regime with improved confinement properties. This regime––the high-density H-mode (HDH)––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 ne up to 4×10²⁰ m⁻³, edge radiation levels up to 90% and plasma partial detachment at the divertor targets can be simultaneously realized. The accessibility to other improved confinement modes in W7-AS (conventional H-mode and OC-mode) is not restricted by the divertor. The results provide a promising basis for future experiments, in particular on W7-X, and recommend the ID as a serious candidate for solving the plasma exhaust problem in stellarators.