Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Home
Search
Quick Search
Advanced
Fulltext
Browse
Collections
Persons
My eDoc
Session History
Login
Name:
Password:
Documentation
Help
Support Wiki
Direct access to
document ID:


          Display Documents



  history
ID: 60376.0, MPI für Plasmaphysik / Articles, Books, Inbooks
The ASDEX Upgrade divertor IIb—a closed divertor for strongly shaped plasmas
Authors:Neu, R.; Fuchs, J. C.; Kallenbach, A.; Maggi, C.; Rohde, V.; Ryter, F.; Eich, T.; Gafert, J.; Gruber, O.; Haas, G.; Herrmann, A.; Kaufmann, M.; Laux, M.; Mertens, V.; Müller, H. W.; Neuhauser, J.; Pütterich, T.; Stober, J.; Yoon, S. W.; ASDEX Upgrade Team
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Volume:43
Start Page:1191
End Page:1196
Copyright:Copyright © Institute of Physics and IOP Publishing Limited 2003
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:TRANSPORT, CONFINEMENT, TOKAMAK, JET
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E4
Identifiers:DOI:10.1088/0029-5515/43/10/021
URL:http://stacks.iop.org/0029-5515/43/1191
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.