DIVIMP modeling of the toroidally-symmetrical injection of 13 CH4 into the upper SOL of DIII-D.
- General Atomics
- University of Toronto Institute for Aerospace Studies
- Lawrence Livermore National Laboratory
- University of Wisconsin - Madison
As part of a study of carbon-tritium co-deposition, we carried out an experiment on DIII-D involving a toroidally symmetric injection of {sup 13}CH{sub 4} at the top of a LSN discharge. A Monte Carlo code, DIVIMP-HC, which includes molecular breakup of hydrocarbons, was used to model the region near the puff. The interpretive analysis indicates a parallel flow in the SOL of M {parallel} {approx} 0.4 directed toward the inner divertor. The CH{sub 4} is ionized in the periphery of the SOL and so the particle confinement time, T{sub C}, is not high, only {approx} 5 ms, and about 4X lower than if the CH{sub 4} were ionized at the separatrix. For such a wall injection location, however, approximately 60-75% of the CH{sub 4} gets ionized to C{sup +}, C{sup 2+}, etc., and is efficiently transported along the SOL to the inner divertor, trapping hydrogen by co-deposition there.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 952803
- Report Number(s):
- SAND2004-2190C; TRN: US200914%%113
- Resource Relation:
- Conference: Proposed for presentation at the 16th International Conference on Plasma Surface Interactions in Controlled Fusion Devices held May 24, 2004 in Portland, ME.
- Country of Publication:
- United States
- Language:
- English
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