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  Properties of the new divertor IIb in ASDEX Upgrade

Neu, R., Fuchs, J. C., Haas, G., Herrmann, A., Kallenbach, A., Laux, M., et al. (2002). Properties of the new divertor IIb in ASDEX Upgrade. Plasma Physics and Controlled Fusion, 44(6), 1021-1029.

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 Creators:
Neu, R.1, Author           
Fuchs, J. C.2, Author           
Haas, G.2, 3, Author           
Herrmann, A.2, Author           
Kallenbach, A.1, Author           
Laux, M.4, 5, Author           
Neuhauser, J.6, Author           
Ryter, F.7, Author           
Gafert, J.6, Author           
Gruber, O.8, Author           
Kaufmann, M.2, 9, Author           
Kurzan, B.10, Author           
Mertens, V.2, Author           
Müller, H. W.2, Author           
Rohde, V.2, Author           
Sips, A.2, Author           
Stober, J.2, Author           
Streibl, B.2, Author           
Treutterer, W.2, Author           
ASDEX Upgrade Team, 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              
3Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
4Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
5W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
6External Organizations, ou_persistent22              
7Tokamak Edge and Divertor Physics (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856308              
8Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society
9Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
10Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              

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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 (delta(bot)) up to 0.48, the outer strike point region was modified and the roof baffle was lowered and diminished at its outer part in comparison with the previous divertor (DIV 11). The inner part of the divertor strike point module remains unchanged, but at the divertor entrance a smooth transition to the central column is provided to minimize local hydrogen recycling. According to experiences with power handling in DIV 11, ordinary fine grain graphite has been chosen for the outer strike point and, as before the tiles are slightly tilted in toroidal direction to hide the leading edges. A first characterization of DIV IIb reveals that the beneficial behaviour of DIV 11 is essentially maintained. There is an increase of the power density due to geometrical reasons at the outer target, whereas the divertor radiation for similar magnetic configurations is unchanged. The pumping characteristics for D and He are almost retained, suggesting a large influence of the inner divertor log, the configuration of which remains unchanged. A significant reduction (20%) of the L-H threshold is observed consistent with larger temperature gradients inside the separatrix just before the transition.

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Language(s): eng - English
 Dates: 2002-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 21069
ISI: 000177105000027
 Degree: -

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Title: Plasma Physics and Controlled Fusion
  Alternative Title : Plasma Phys. Control. Fusion
Source Genre: Journal
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Pages: - Volume / Issue: 44 (6) Sequence Number: - Start / End Page: 1021 - 1029 Identifier: ISSN: 0741-3335