OEDGE modeling of the DIII-D double null 13CH4 puffing experiment.
- General Atomics, San Diego, CA
- Oak Ridge National Laboratory, Oak Ridge, TN
- University of Toronto Institute for Aerospace Studies, Toronto, Canada
- Lawrence Livermore National Laboratory, Livermore, CA
Unbalanced double null ELMy H-mode configurations in DIII-D are used to simulate the situation in ITER high triangularity, burning plasma magnetic equilibria, where the second X-point lies close to the top of the vacuum vessel, creating a secondary divertor region at the upper blanket modules. The measured plasma conditions in the outer secondary divertor closely duplicated those projected for ITER. {sup 13}CH{sub 4} was injected into the secondary outer divertor to simulate sputtering there. The majority of the {sup 13}C found was in the secondary outer divertor. This material migration pattern is radically different than that observed for main wall {sup 13}CH{sub 4} injections into single null configurations where the deposition is primarily at the inner divertor. The implications for tritium codeposition resulting from sputtering at the secondary divertor in ITER are significant since release of tritium from Be co-deposits at the main wall bake temperature for ITER, 240 C, is incomplete. The principal features of the measured {sup 13}C deposition pattern have been replicated by the OEDGE interpretive code.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1000281
- Report Number(s):
- SAND2010-3841C; TRN: US1008209
- Resource Relation:
- Conference: Proposed for presentation at the 19th International Conference on Plasma-Surface Interactions held May 24-28, 2010 in San Diego, CA.
- Country of Publication:
- United States
- Language:
- English
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