Simulation of Main-Chamber Recycling in DIII-D with the UEDGE Code

Conference · Wed Apr 26 04:00:00 EDT 2006

DOI:https://doi.org/10.1016/j.jnucmat.2007.01.252· OSTI ID:891056

Rensink, M; Groth, M; Porter, G; Rognlien, T; Watkins, J

This report demonstrates a computer simulation model for single-null diverted plasma configurations that include simultaneous interaction of the scrape-off layer (SOL) plasma with toroidally symmetric main-chamber limiter surfaces and divertor plate surfaces. The simulations use the UEDGE code which treats the SOL plasma and recycled neutrals as two-dimensional toroidally symmetric fluids. The spatial domain can include field lines that intersect main chamber surfaces in the far scrape-off layer, which allows the model to include simultaneous plasma contact with both divertor and main chamber targets. Steady-state simulation results for low-density L-mode plasma discharges in DIII-D show that total core fueling increases by about 70 percent when the separatrix-baffle gap is reduced from 6 cm to 3 cm. The additional core fueling is due to neutrals which originate from the ion particle flux incident on the upper outer divertor baffle.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 891056
• Report Number(s): UCRL-PROC-220897
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPUTERIZED SIMULATION
DIVERTORS
DOUBLET-3 DEVICE
PLASMA
PLATES
RECYCLING
SIMULATION
SOLS
TARGETS