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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. Nuclear Fusion, 43(7), 573-578. doi:10.1088/0029-5515/43/7/310.

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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: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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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 (7) Sequence Number: - Start / End Page: 573 - 578 Identifier: -