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  Investigation of the beta-limit in the W7-AS stellarator

Weller, A., Geiger, J., Zarnstorff, M., Sallander, E., Klose, S., Werner, A., et al. (2003). Investigation of the beta-limit in the W7-AS stellarator. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3C27-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3C28-8
Genre: Conference Paper

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 Creators:
Weller, A.1, Author              
Geiger, J.2, Author              
Zarnstorff, M.3, Author
Sallander, E.1, Author              
Klose, S.4, 5, Author              
Werner, A.6, Author              
Baldzuhn, J.7, Author              
Brakel, R.2, Author              
Burhenn, R.8, 9, Author              
Ehmler, H.1, 8, Author              
Gadelmeier, F.7, Author              
Giannone, L.10, Author              
Hartmann, D.11, Author              
Jaenicke, R.2, 9, Author              
Knauer, J.7, Author              
Laqua, H. P.7, Author              
Nührenberg, C.12, Author              
Pasch, E.13, Author              
Rust, N.14, Author              
Speth, E.11, Author              
Spong, D. A.3, AuthorWagner, F.2, Author              Wenzel, U.4, Author              W7-AS Team15, AuthorNBI Group15, Author more..
Affiliations:
1Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
2Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
3Princeton Plasma Physics Laboratory, Princeton, NJ, USA; Oak Ridge National Laboratory, Oak Ridge, TN, USA, ou_persistent22              
4Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
5Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
6W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
7External Organizations, ou_persistent22              
8VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
9W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
10Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
11Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
12Stellarator Theory (ST), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856287              
13Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
14W7-X: Heating (HT), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856343              
15Max Planck Society, ou_persistent13              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Internal
 Degree: -

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Title: 19th Fusion Energy Conference
Place of Event: Lyon (FR)
Start-/End Date: 2002-10-14 - 2002-10-19

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Title: Fusion Energy 2002
Source Genre: Proceedings
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Publ. Info: Vienna : International Atomic Energy Agency
Pages: CD-ROM Volume / Issue: - Sequence Number: EX/S3-1 Start / End Page: - Identifier: -