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OEDGE Modeling of C Deposition in the Inner Divertor of DIII-D.

DE200515011802

Publication Date	2005
Personal Author	Elder, J. D.; Stangeby, P. C.; Whyte, D. G.; Allen, S. L.; McLean, A.; Boedo, J. A.; Bray, B. D.; Brooks, N. H.; Fenstermacher, M. E.; Groth, M.; Lasnier, C. J.
Page Count	18
Abstract	Use of carbon in tokamaks leads to a major tritium retention issue due to co-deposition. To investigate this process a low power (no beams) L-mode experiment was performed on DIII-D in which (sup 13)CH(sub 4) was puffed into the main vessel through the toroidally-symmetric pumping plenum at the top of lower single-null discharges. Subsequently, the (sup 13)C content of tiles taken from the vessel wall was measured. The interpretive OEDGE code was used to model the results. It was found that the (sup 13)C deposition pattern is controlled by: (a) source strength of (sup 13)C(sup +), (b) radial location of the (sup 13)C(sup +) source, (c) D(sub (perpendicular)), (d) M(sub (parallel)), the scrape-off layer parallel Mach number. Best agreement was found for (a) (approx.) 50% conversion efficiency ((sup 13)CH(sub 4) (yields) (sup 13)C(sup +), (b) (sup 13)C(sup +) source (approx.) 3.5 cm outboard of separatrix near (sup 13)CH(sub 4) injection location, (c) D(sub (perpendicular)) (approx.) 0.3 m(sup 2)s(sup -1), (d) M(sub (parallel)) (approx.) 0.4 toward inside.
Keywords	Plasma Doublet-3 device Divertors Carbon Deposition Tokamak devices Efficiency Mach number Pumping Retention Simulation Tritium OEDGE(Osm Eirene Divimp edge)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200602

OEDGE Modeling of C Deposition in the Inner Divertor of DIII-D.

OEDGE Modeling of C Deposition in the Inner Divertor of DIII-D.
DE200515011802

Publication Date	2005
Personal Author	Elder, J. D.; Stangeby, P. C.; Whyte, D. G.; Allen, S. L.; McLean, A.; Boedo, J. A.; Bray, B. D.; Brooks, N. H.; Fenstermacher, M. E.; Groth, M.; Lasnier, C. J.
Page Count	18
Abstract	Use of carbon in tokamaks leads to a major tritium retention issue due to co-deposition. To investigate this process a low power (no beams) L-mode experiment was performed on DIII-D in which (sup 13)CH(sub 4) was puffed into the main vessel through the toroidally-symmetric pumping plenum at the top of lower single-null discharges. Subsequently, the (sup 13)C content of tiles taken from the vessel wall was measured. The interpretive OEDGE code was used to model the results. It was found that the (sup 13)C deposition pattern is controlled by: (a) source strength of (sup 13)C(sup +), (b) radial location of the (sup 13)C(sup +) source, (c) D(sub (perpendicular)), (d) M(sub (parallel)), the scrape-off layer parallel Mach number. Best agreement was found for (a) (approx.) 50% conversion efficiency ((sup 13)CH(sub 4) (yields) (sup 13)C(sup +), (b) (sup 13)C(sup +) source (approx.) 3.5 cm outboard of separatrix near (sup 13)CH(sub 4) injection location, (c) D(sub (perpendicular)) (approx.) 0.3 m(sup 2)s(sup -1), (d) M(sub (parallel)) (approx.) 0.4 toward inside.
Keywords	Plasma Doublet-3 device Divertors Carbon Deposition Tokamak devices Efficiency Mach number Pumping Retention Simulation Tritium OEDGE(Osm Eirene Divimp edge)
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200602