Development of a radiative divertor for DIII-D
Abstract
We have used experiments and modeling to develop a new radiative divertor configuration for DIII-D. Gas puffing experiments with the existing open divertor have shown the creation of a localized (approximately 10 cm diameter) radiation zone which results in substantial reduction (3-10) in the divertor heat flux while tau(sub E) remains approximately 2 times ITER-89P scaling. However, n(sub e) increases with D(sub 2) puffing, and Z(sub eff) increases with neon puffing. Divertor structures are required to minimize the effects on the core plasma. The UEDGE fluid code, benchmarked with DIII-D data, and the DEGAS neutrals transport code are used to estimate the effectiveness of divertor configurations; slots reduce the core ionization more than baffles. The overall divertor shape is set by confinement studies which indicate that high triangularity (delta approximately equal to 0.8) is important for high tau(sub E)VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.
- Publication:
-
Presented at the 11th International Conference on Plasma Surface Interactions in Controlled Fusion Devices
- Pub Date:
- July 1994
- Bibcode:
- 1994psic.conf...23A
- Keywords:
-
- Diverters;
- Heat Flux;
- Plasma Control;
- Plasma Physics;
- Tokamak Devices;
- Baffles;
- Computer Programs;
- Computerized Simulation;
- Ionization;
- Neon;
- Research And Development;
- Slots;
- Plasma Physics