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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60039.0, MPI für Plasmaphysik / Conference Papers
Major results from Wendelstein 7-AS stellarator
Authors:Wagner, F.; Burhenn, R.; Gadelmeier, F.; Geiger, J.; Hirsch, M.; Laqua, H. P.; Weller, A.; Werner, A.; Bäumel, S.; Baldzuhn, J.; Brakel, R.; Dinklage, A.; Grigull, P.; Endler, M.; Erckmann, V.; Ehmler, H.; Feng, Y.; Fischer, R.; Giannone, L.; Hartfuss, H.-J.; Hildebrandt, D.; Holzhauer, E.; Igitkhanov, Y.; Jaenicke, R.; Kick, M.; Kislyakov, A.; Kreter, A.; Kisslinger, J.; Klinger, T.; Klose, S.; Knauer, J. P.; König, R.; Kühner, G.; Maassberg, H.; McCormick, K.; Naujoks, D.; Niedermeyer, H.; Nührenberg, C.; Pasch, E.; Ramasubramanian, N.; Rust, N.; Sallander, E.; Sardei, F.; Wenzel, U.; Wobig, H.; Würsching, E.; Zarnstorff, M.; Zoletnik, S.; W7-AS Team
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:OV/2-4
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:W7-AS operates with an island divertor, which utilises the natural edge islands of the low-shear stellarator configuration to divert the plasma. High
densities (up to 4×1020m-3) and partly detached divertor conditions have been attained. The details of the divertor operation will be described along with the
3D-efforts to model the divertor observations. At a density beyond 1.5×1020m-3 another confinement bifurcation appears, which allows steady state operation at
good energy and low impurity confinement. The transition is possible from a state of normal confinement or from ELMy or quiescent H-modes. Starting with
normal confinement, bifurcation is initiated by a broadening of the density profile. This regime can easily be heated above cut-off by ECRH using
electron-bernstein-wave mode conversion. The highest beta-values (>3%) are achieved at high density. The relevance of the W7-AS data for Wendelstein 7-X
and the Helias-reactor will be discussed.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E3
External Affiliations:IOFFE-Institute, St. Petersburg, Russia; Forschungszentrum Jülich, EURATOM Association, Jülich, Germany; Princeton Plasma Physics Laboratory, Princeton, USA; KFKI-RMKI, EURATOM Association, Budapest, Hungaria
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