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  Edge transport and its interconnection with main chamber recycling in ASDEX Upgrade

Kallenbach, A., Dux, R., Gafert, J., Haas, G., Horton, L. D., Jakobi, M., et al. (2003). Edge transport and its interconnection with main chamber recycling in ASDEX Upgrade. In 19th Fusion Energy Conference (pp. EX/P4-05).

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 Creators:
Kallenbach, A.1, Author              
Dux, R.1, Author              
Gafert, J.2, Author              
Haas, G.3, 4, Author              
Horton, L. D.3, Author              
Jakobi, M.5, Author              
Kurzan, B.5, Author              
Müller, H. W.3, Author              
Neu, R.1, Author              
Neuhauser, J.2, Author              
Pugno, R.2, Author              
Pütterich, T.1, Author              
Rohde, V.3, Author              
Sandmann, W.3, Author              
Yoon, S.-W.2, Author              
ASDEX Upgrade Team6, Author
Affiliations:
1Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
2External Organizations, ou_persistent22              
3Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
4Technology (TE), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856318              
5Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              
6Max Planck Society, ou_persistent13              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/0029-5515/43/7/310
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Title: 19th Fusion Energy Conference
Place of Event: Lyon (FR)
Start-/End Date: 2002 - 2002

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Title: 19th Fusion Energy Conference
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: EX/P4-05 Identifier: -