Influence of magnetic field configurations on divertor plasma parameters in the 
W7-AS stellarator

Grigull, P.; McCormick, K.; Feng, Y.; Werner, A.; Brakel, R.; Ehmler, H.; Gadelmeier, F.; Hartmann, D.; Hildebrandt, D.; Jaenicke, R.; Kisslinger, J.; Klinger, T.; König, R.; Naujoks, D.; Niedermeyer, H.; Ramasubramanian, N.; Sardei, F.; Wagner, F.; Wenzel, U.; W7-AS Team,

doi:10.1016/S0022-3115(02)01499-X

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Influence of magnetic field configurations on divertor plasma parameters in the W7-AS stellarator

MPG-Autoren

/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/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/persons110781

Werner, A.
W7-X: Physics (PH), 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/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/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/persons109653

König, R.
W7-X: Physics (PH), 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;

Ramasubramanian, N.
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/persons110778

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

W7-AS Team,
Max Planck Institute for Plasma Physics, Max Planck Society;

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Zitation

Grigull, P., McCormick, K., Feng, Y., Werner, A., Brakel, R., Ehmler, H., et al. (2003). Influence of magnetic field configurations on divertor plasma parameters in the W7-AS stellarator. Journal of Nuclear Materials, 313-316, 1287-1291. doi:10.1016/S0022-3115(02)01499-X.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0027-2F86-2

Zusammenfassung

The new island divertor in W7-AS enables quasi steady-state operation with NBI at very high density including scenarios with stable detachment from the targets. Experiments with reversed B-field indicate that the interaction zones on the targets are affected in first order by E×B drifts. Stable detachment is restricted to magnetic field configurations with sufficiently large separation between x-points and targets and not too small field line pitch inside the islands. It is always partial in the sense that it does not extend over the full target area. This inhomogeneity is ascribed to an in/out asymmetry of the electron temperature at the upstream separatrix position.