OEDGE modeling of 13C deposition in the inner divertor of DIII-D.
- General Atomics
- Lawrence Livermore National Laboratory
- University of Wisconsin - Madison
- University of Toronto Institute for Aerospace Studies
- University of California - San Diego
Use of carbon in tokamaks leads to a major tritium retention issue due to co-deposition. To investigate this process a low power 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) {Delta}r{sub s}, radial location of the {sup 13}C{sup +} source, (c) D{perpendicular}, (d) M{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) {delta}r{sub s}, {approx} +3.5 cm (outboard of separatrix) near {sup 13}CH{sub 4} injection location, (c) D {perpendicular} {approx} 0.3 m{sup 2}/s, (d) M {parallel} {approx} 0.4 toward inside.
- Research Organization:
- Sandia National Laboratories
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 952796
- Report Number(s):
- SAND2004-2193C
- Country of Publication:
- United States
- Language:
- English
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