ELM flushing and impurity transport in the H-mode edge barrier in ASDEX Upgrade

ELM flushing and impurity transport in the H-mode edge barrier in ASDEX Upgrade

Density profiles of He2+, C6+, Ne10+ and Ar16+ are measured at ASDEX Upgrade with high temporal (1.9ms) and radial resolution (>3mm) using CXRS. This allows the transport coefficients at the edge transport barrier to be analyzed in between type-I ELMs during H-mode. All measurements resemble the...

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Bibliographic Details
Published in:Journal of nuclear materials Vol. 415; no. 1; pp. S334 - S339
Main Authors: Pütterich, T., Dux, R., Janzer, M.A., McDermott, R.M.
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 01-08-2011
Elsevier
Subjects:
Applied sciences
Consistency
Controled nuclear fusion plants
Density
Elm
Energy
Energy. Thermal use of fuels
Erosion
Exact sciences and technology
Fission nuclear power plants
Fluxes
Fuels
Impurities
Installations for energy generation and conversion: thermal and electrical energy
Mathematical models
Nuclear fuels
Transport
Tokamak
Plasma
Scrape-off layer
Impurity
Concentration effect
Edge localized modes
Diffusion coefficient
Deposition
Erosion
Nuclear reactor
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Summary:Density profiles of He2+, C6+, Ne10+ and Ar16+ are measured at ASDEX Upgrade with high temporal (1.9ms) and radial resolution (>3mm) using CXRS. This allows the transport coefficients at the edge transport barrier to be analyzed in between type-I ELMs during H-mode. All measurements resemble the neoclassical transport coefficients, which means that the diffusion coefficient ranges from 0.15 to 0.35m2/s and the maximum of the inward convection velocity is Z-dependent increasing from 15m/s (He2+) to 90m/s (Ar16+). These results are combined into a simplified transport-erosion model for W which calculates the neoclassical transport coefficients self-consistently while taking several impurity species into account. The model also calculates erosion fluxes at the wall, prompt re-deposition of W and loss terms due to parallel flows in the scrape-off layer. While several free parameters exist in the model, it demonstrates that a quantitative consistency between the measured erosion fluxes of W and the observed W concentration inside the plasma is obtainable.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2010.09.052