Ion beam analysis of C-13 and deuterium deposition in DIII-D and their removal by in-situ oxygen baking
- Sandia National Laboratories (SNL)
- Lawrence Livermore National Laboratory (LLNL)
- General Atomics, San Diego
- Univ Toronto, Inst Aerosp Studies, Toronto, ON M3H 5T6, Canada
- Oak Ridge National Laboratory (ORNL)
An experiment was conducted in DIII-D to examine carbon deposition when a secondary separatrix is near the wall. The magnetic configuration for this experiment was a biased double-null, similar to that foreseen for ITER. C-13 methane was injected toroidally symmetrically near the secondary separatrix into ELMy H-mode deuterium plasmas. The resulting deposition of C-13 was determined by nuclear reaction analysis. These results show that very little of the injected C-13 was deposited at the primary separatrix, whereas a large fraction of injected C-13 was deposited close to the point of injection near the secondary separatrix. Six of the tiles were put back into DIII-D, where they were baked at 350-360 degrees C for 2 h at similar to 1 kPa in a 20% O-2/80% He gas mixture. Subsequent ion beam analysis of these tiles showed that about 21% of the C-13 and 54% of the deuterium were removed by the bake.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1047659
- Resource Relation:
- Conference: 13th International Workshop on Plasma-Facing Materials and Components for Fusion Applications (PFMC)/1st International Conference on Fusion Energy Materials Science (FEMaS), Rosenheim, Germany, 20110509, 20110513
- Country of Publication:
- United States
- Language:
- English
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