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  Improved Performance of the W7-AS Stellarator with the New Island Divertor

Brakel, R., Grigull, P., McCormick, K., Burhenn, R., Feng, Y., Sardei, F., et al. (2003). Improved Performance of the W7-AS Stellarator with the New Island Divertor. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3F45-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-3F46-A
Genre: Conference Paper

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 Creators:
Brakel, R.1, Author              
Grigull, P.2, Author              
McCormick, K.3, 4, Author              
Burhenn, R.4, 5, Author              
Feng, Y.4, 6, Author              
Sardei, F.6, Author              
Baldzuhn, J.7, Author              
Ehmler, H.3, 5, Author              
Gadelmeier, F.7, Author              
Giannone, L.8, Author              
Hildebrandt, D.9, Author              
Ida, K.10, Author
Jaenicke, R.1, 4, Author              
Kisslinger, J.1, Author              
Klinger, T.3, 5, Author              
Knauer, J. P.7, Author              
König, R.2, Author              
Kühner, G.11, Author              
Laqua, H. P.7, Author              
Naujoks, D.9, Author              
Niedermeyer, H.12, Author              Pasch, E.13, Author              Ramasubramanian, N.14, AuthorRust, N.15, Author              Wagner, F.1, Author              Weller, A.3, Author              Wenzel, U.9, Author              Werner, A.2, Author              W7-AS Team14, Author more..
Affiliations:
1Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
2W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
3Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
4W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
5VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
6W7-X: Theory, Max Planck Institute for Plasma Physics, Max Planck Society
7External Organizations, ou_persistent22              
8Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
9Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
10National Institute of Fusion Science, Toki, Japan, ou_persistent22              
11Computer Center Garching (RZG), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856297              
12W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856314              
13Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
14Max Planck Society, ou_persistent13              
15W7-X: Heating (HT), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856343              

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 Abstract: The island divertor concept has successfully been realized at W7-AS. The divertor gives access to a new NBI-heated high density regime with densities up to 4×10²⁰m-3 and energy confinement well above customary scalings. This regime appears promising with respect to the requirements of both confinement and exhaust. Many features are reminiscent of a quiescent H-mode, but plasma particle transport behaves differently. Beyond a threshold density energy confinement approximately doubles whereas particle confinement dramatically decreases. The density profile flattens and the inward impurity pinch is reduced. This eases density control, prevents impurity accumulation, and allows for quasi-stationary conditions with radiation profiles peaked at the edge. At the highest densities partial detachment occurs with a radiated power fraction up to 90% at a tolerable expense of plasma energy. The sub-divertor pressure is sufficient for pumping. Major experimental results, such as the lack of a high recycling phase preceding detachment, are also predicted by the EMC3/EIRENE code.

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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/C5-4 Start / End Page: - Identifier: -