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  Impurity transport model for the normal confinement and high density H-mode discharges in Wendelstein 7-AS

Ida, K., Burhenn, R., McCormick, K., Pasch, E., Yamada, H., Yoshinuma, M., et al. (2003). Impurity transport model for the normal confinement and high density H-mode discharges in Wendelstein 7-AS. Plasma Physics and Controlled Fusion, 45, 1931-1938. doi:10.1088/0741-3335/45/10/006.

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 Creators:
Ida, K.1, Author
Burhenn, R.2, 3, Author              
McCormick, K.3, 4, Author              
Pasch, E.5, Author              
Yamada, H.1, Author
Yoshinuma, M.1, Author
Inagaki, S.1, Author
Murakami, S.1, Author
Osakabe, M.1, Author
Liang, Y.1, Author
Brakel, R.6, Author              
Ehmler, H.2, 4, Author              
Giannone, L.7, Author              
Grigull, P.8, Author              
Knauer, J. P.9, Author              
Maassberg, H.6, Author              
Weller, A.4, Author              
Affiliations:
1National Institute for Fusion Sciences, Toki, Gifu 509-5292, Japan, ou_persistent22              
2VINETA, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856311              
3W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
4Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
5Stellarator Optimisation (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856329              
6Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856291              
7Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
8W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
9External Organizations, ou_persistent22              

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 Abstract: An impurity transport model based on diffusivity and the radial convective velocity is proposed as a first approach to explain the differences in the time evolution of Al XII (0.776 nm), Al XI (55 nm) and Al X (33.3 nm) lines following Al-injection by laser blow-off between normal confinement discharges and high density H-mode (HDH) discharges. Both discharge types are in the collisional regime for impurities (central electron temperature is 0.4 keV and central density exceeds 1020m-3). In this model, the radial convective velocity is assumed to be determined by the radial electric field, as derived from the pressure gradient. The diffusivity coefficient is chosen to be constant in the plasma core but is significantly larger in the edge region, where it counteracts the high local values of the inward convective velocity. Under these conditions, the faster decay of aluminium in HDH discharges can be explained by the smaller negative electric field in the bulk plasma, and correspondingly smaller inward convective velocity, due to flattening of the density profiles.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
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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: 45 Sequence Number: - Start / End Page: 1931 - 1938 Identifier: -