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  The ASDEX Upgrade divertor IIb—a closed divertor for strongly shaped plasmas

Neu, R., Fuchs, J. C., Kallenbach, A., Maggi, C., Rohde, V., Ryter, F., et al. (2003). The ASDEX Upgrade divertor IIb—a closed divertor for strongly shaped plasmas. Nuclear Fusion, 43, 1191-1196. doi:10.1088/0029-5515/43/10/021.

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 Creators:
Neu, R.1, Author           
Fuchs, J. C.2, Author           
Kallenbach, A.1, Author           
Maggi, C.1, Author           
Rohde, V.2, Author           
Ryter, F.3, Author           
Eich, T.2, Author           
Gafert, J.4, Author           
Gruber, O.5, Author           
Haas, G.2, 6, Author           
Herrmann, A.2, Author           
Kaufmann, M.2, 7, Author           
Laux, M.8, Author           
Mertens, V.2, Author           
Müller, H. W.2, Author           
Neuhauser, J.4, Author           
Pütterich, T.1, Author           
Stober, J.2, Author           
Yoon, S. W.4, Author           
ASDEX Upgrade Team9, Author
Affiliations:
1Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
3Tokamak Edge and Divertor Physics (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856308              
4External Organizations, ou_persistent22              
5Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society
6Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
7Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
8W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
9Max Planck Society, ou_persistent13              

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 Abstract: A new divertor configuration (DIV-IIb) has been implemented in ASDEX Upgrade. In order to accommodate a large variety of plasma shapes with bottom triangularities (δbot) up to 0.48, the outer strikepoint region was modified and the roof baffle was lowered and diminished at its outer part in comparison with the previous divertor (DIV-II). The inner part of the divertor strikepoint module remains unchanged, but a smooth transition to the central column is provided at the divertor entrance to minimize local hydrogen recycling. An increase in power density is observed due to geometrical reasons at the outer target, whereas the divertor radiation for similar configurations and discharge conditions is unchanged. The pumping characteristics for D and He are almost retained, suggesting a large influence of the inner divertor leg, the configuration of which remains as before. Detachment in L-mode discharges fits well into a scaling deduced from JET data and earlier ASDEX Upgrade data. A significant reduction (20%) of the L–H threshold is observed compared with DIV-II. Its density dependence is weaker than in the previous DIV-II configuration and there are hints for an influence of triangularity on power threshold. Finally, clear evidence for a parasitic plasma below the divertor roof baffle is found.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
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Publ. Info: Copyright © Institute of Physics and IOP Publishing Limited 2003
Pages: - Volume / Issue: 43 Sequence Number: - Start / End Page: 1191 - 1196 Identifier: -