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          Institute: MPI für Plasmaphysik     Collection: Articles, Books, Inbooks     Display Documents



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ID: 56318.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Edge transport and its interconnection with main chamber recycling in ASDEX Upgrade
Authors:Kallenbach, A.; Dux, R.; Gafert, J.; Haas, G.; Horton, L. D.; Jakobi, M.; Kurzan, B.; Müller, H. W.; Neu, R.; Neuhauser, J.; Pugno, R.; Pütterich, T.; Rohde, V.; Sandmann, W.; 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
Issue / Number:7
Start Page:573
End Page:578
Copyright:Copyright © Institute of Physics and IOP Publishing Limited 2003
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Edge profiles of electron temperature and density are measured in ASDEX Upgrade with a high spatial resolution of 2–3 mm with Thomson scattering. In the region of the edge transport barrier in ELMy H-mode, the gradient lengths of Te and ne are found closely coupled, with the temperature decay length two times shorter than the density decay length corresponding to ηe ≈ 2. The ηe constraint allows us to calculate the electron temperature and density profiles from the pressure profile if the density and temperature values are known at one spatial position. The edge density in the region of the barrier foot is closely coupled to the main chamber recycling, with no strong dependence on other parameters. In contrast, the density rise from the outer barrier foot to the pedestal exhibits pronounced dependence on plasma current and shaping, indicating quite different mechanisms determining the absolute density and its gradient.
Free Keywords:H-MODE PEDESTAL, SCRAPE-OFF LAYER, PLASMA SHAPE, DIII-D, NEUTRALS, PHYSICS, ELMS, JET
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E4
Identifiers:DOI:10.1088/0029-5515/43/7/310
URL:http://stacks.iop.org/0029-5515/43/573
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