OEDGE modeling of the DIII-D double null (CH4)-C-13 puffing experiment

Conference · Sat Jan 01 04:00:00 EST 2011

OSTI ID:1038502

Elder, J D ^[1]; Wampler, W R ^[2]; McLean, A G ^[3]; Stangeby, P C ^[4]; Allen, S L ^[5]; Bray, B D ^[6]; Brooks, N H ^[6]; Leonard, A W ^[7]; Unterberg, Ezekial A ^[8]; Watkins, J G ^[2]

---

1. University of Toronto, Toronto, ON, Canada
2. Sandia National Laboratories (SNL)
3. Oak Ridge National Laboratory (ORNL)
4. University of Toronto Institute for Aerospace Studies
5. Lawrence Livermore National Laboratory (LLNL)
6. General Atomics, San Diego
7. General Atomics
8. ORNL

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. (CH4)-C-13 was injected into the secondary outer divertor to simulate sputtering there. The majority of the C-13 found was in the secondary outer divertor. This material migration pattern is radically different than that observed for main wall (CH4)-C-13 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 degrees C, is incomplete. The principal features of the measured C-13 deposition pattern have been replicated by the OEDGE interpretive code.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1038502
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DEPOSITION
DIVERTORS
DOUBLET-3 DEVICE
PLASMA
SIMULATION
SPUTTERING
TRITIUM