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  Transport into and across the scrape-off layer in the ASDEX Upgrade divertor tokamak

Neuhauser, J., Coster, D., Fahrbach, H. U., Fuchs, J. C., Haas, G., Herrmann, A., et al. (2002). Transport into and across the scrape-off layer in the ASDEX Upgrade divertor tokamak. Plasma Physics and Controlled Fusion, 44(6), 855-869.

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Neuhauser, J.1, Autor           
Coster, D.2, Autor           
Fahrbach, H. U.3, Autor           
Fuchs, J. C.3, Autor           
Haas, G.3, 4, Autor           
Herrmann, A.3, Autor           
Horton, L. D.3, Autor           
Jakobi, M.5, Autor           
Kallenbach, A.6, Autor           
Laux, M.7, 8, Autor           
Kim, J. W.9, Autor           
Kurzan, B.5, Autor           
Müller, H. W.3, Autor           
Murmann, H.1, Autor           
Neu, R.6, Autor           
Rohde, V.3, Autor           
Sandmann, W.3, Autor           
Suttrop, W.5, Autor           
Wolfrum, E.3, Autor           
ASDEX Upgrade Team, Autor  
Affiliations:
1External Organizations, ou_persistent22              
2Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
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              
6Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
7Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
8W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
9Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society

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 Zusammenfassung: The elements of transport into and across the scrape-off layer in the poloidal divertor tokamak ASDEX Upgrade are analysed for different operational regimes with emphasis on enhanced confinement regimes with an edge barrier. Utilizing the existing set of edge diagnostics, especially the high- resolution multi-pulse edge Thomson scattering system, in combination with long discharge plateaus, radial sweeps and advanced averaging techniques, detailed radial mid-plane profiles of diverted plasmas are obtained. Profiles are smooth across the separatrix, indicating strong radial correlation, and there is no remarkable variation across the second separatrix either. Together with measured input, recycling, pumping and bypass fluxes, a corrected separatrix position is determined and transport characteristics are derived in the different radial zones generally identified in the profile structure. Transport in the steep gradient region inside and across the separatrix shows typical ballooning-type critical electron pressure gradient scaling and, in parallel, even a clear correlation between radial electron density and temperature decay lengths (e.g. eta(e) = d(ln T)/d(ln n) similar to 2 for type-I ELMy H-modes). These findings indicate the importance of stiff profiles in this region, while diffusion coefficients are secondary parameters, determined essentially by the source distribution. The outer scrape-off layer wing exhibits a more filamentary structure with preferential outward drift especially in high-performance discharges, with formal diffusion coefficients far above the Bohm value in agreement with results on the old ASDEX experiment. A basic mechanism involved there seems to be partial loss of equilibrium and fast curvature-driven outward acceleration, in principle well known from theory, investigated decades ago in pinch experiments and utilized recently in high- field-side pellet fuelling.

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Sprache(n): eng - English
 Datum: 2002
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 21071
ISI: 000177105000017
 Art des Abschluß: -

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Titel: Plasma Physics and Controlled Fusion
  Alternativer Titel : Plasma Phys. Control. Fusion
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 44 (6) Artikelnummer: - Start- / Endseite: 855 - 869 Identifikator: ISSN: 0741-3335