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  Divertor operation in stellarators: results from W7-AS and implications for future devices

Grigull, P., McCormick, K., Renner, H., Masuzaki, S., König, R., Baldzuhn, J., et al. (2003). Divertor operation in stellarators: results from W7-AS and implications for future devices. Fusion Engineering and Design, 66-68, 49-58. doi:10.1016/S0920-3796(03)00121-2.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-2385-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-239A-3
Genre: Journal Article

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 Creators:
Grigull, P.1, Author              
McCormick, K.2, 3, Author              
Renner, H.4, Author              
Masuzaki, S.5, Author
König, R.1, Author              
Baldzuhn, J.6, Author              
Bäumel, S.7, Author              
Burhenn, R.3, 8, Author              
Brakel, R.7, Author              
Ehmler, H.2, 8, Author              
Feng, Y.3, 9, Author              
Gadelmeier, F.6, Author              
Giannone, L.10, Author              
Hartmann, D.11, Author              
Hildebrandt, D.12, Author              
Hirsch, M.1, Author              
Jaenicke, R.3, 7, Author              
Kisslinger, J.7, Author              
Klinger, T.2, 8, Author              
Knauer, J.6, Author              
Naujoks, D.12, Author              Niedermeyer, H.4, Author              Pasch, E.13, Author              Ramasubramanian, N.14, AuthorSardei, F.9, Author              Wagner, F.7, Author              Wenzel, U.12, Author              Werner, A.1, Author              W7-AS Team14, Author more..
Affiliations:
1W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
2Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
3W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
4W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856314              
5National Institute for Fusion Science, Toki-shi, Gifu-ken 509-5292, Japan, ou_persistent22              
6External Organizations, ou_persistent22              
7Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
8VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
9W7-X: Theory, Max Planck Institute for Plasma Physics, Max Planck Society
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              
12Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
13Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
14Max Planck Society, ou_persistent13              

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Free keywords: 22nd Symposium on Fusion Technology (SOFT 2002), Helsinki, 2002-09-09 to 2002-09-13
 Abstract: The research on divertors for stellarators is at the beginning. Extensive studies are being prepared on large helical device (LHD) and W7-X. W7-AS is now being operated with an open island divertor (ID) which serves as a test bed for the W7-X divertor. The divertor enables access to a new NBI-heated, high-density operating regime with improved confinement properties. This regime––the high-density H-mode (HDH)––displays no evident mode activity, is extant above a threshold density and characterized by flat density profiles, high-energy- and low-impurity-confinement times and edge-localized radiation. Impurity accumulation, normally associated with ELM-free H-modes, is avoided. Quasi-steady-state discharges with ne up to 4×10²⁰ m⁻³, edge radiation levels up to 90% and plasma partial detachment at the divertor targets can be simultaneously realized. The accessibility to other improved confinement modes in W7-AS (conventional H-mode and OC-mode) is not restricted by the divertor. The results provide a promising basis for future experiments, in particular on W7-X, and recommend the ID as a serious candidate for solving the plasma exhaust problem in stellarators.

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

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Title: Fusion Engineering and Design
  Alternative Title : Fusion Eng. Des.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier B.V. All rights reserved
Pages: - Volume / Issue: 66-68 Sequence Number: - Start / End Page: 49 - 58 Identifier: -