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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60019.0, MPI für Plasmaphysik / Conference Papers
Investigation of the beta-limit in the W7-AS stellarator
Authors:Weller, A.; Geiger, J.; Zarnstorff, M.; Sallander, E.; Klose, S.; Werner, A.; Baldzuhn, J.; Brakel, R.; Burhenn, R.; Ehmler, H.; Gadelmeier, F.; Giannone, L.; Hartmann, D.; Jaenicke, R.; Knauer, J.; Laqua, H. P.; Nührenberg, C.; Pasch, E.; Rust, N.; Speth, E.; Spong, D. A.; Wagner, F.; Wenzel, U.; W7-AS Team; NBI Group
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/S3-1
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:Investigations of the performance and stability of high-beta plasmas have been restarted in W7-AS utilizing higher heating powers and the new divertor system. The combination of beneficial effects resulted in a significant increase of the volume averaged β from 2 % up to 3.1 % and in MHD-quiescent, quasi-stationary discharges at low radiation levels. Experimental studies of equilibrium effects and of MHD mode activity have been performed with the X-ray tomography system. In addition results of computational MHD stability studies are presented, which show an increase of the stability with increasing β due to the pressure induced deepening of the magnetic well in combination with increasing magnetic shear, in qualitative agreement with the experimental data. The maximum achieved β is limited by the available heating power and not by stability effects. The equilibrium β-limit is approached in the case of low-iota configurations. Particularly with regard to current carrying stellarators and comparisons with tokamaks the modification of the stability of high-beta plasmas by significant OH-currents has been investigated.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E5
External Affiliations:Princeton Plasma Physics Laboratory, Princeton, NJ, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA
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