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 (∼ 10 cm diameter) radiation zone which results in substantial reduction (3–10) in the divertor heat flux while τE remains ∼ 2 times ITER-89P scaling. However, ne increases with D2 puffing, and Zeff 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 (δ ≈ 0.8) is important for high τE VH-modes. Results from engineering feasibility studies, including diagnostic access, will be presented.
Original language | English |
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Pages (from-to) | 336-341 |
Number of pages | 6 |
Journal | Journal of Nuclear Materials |
Volume | 220-222 |
DOIs | |
State | Published - 1995 |
Externally published | Yes |
Funding
We would like to acknowledge the work of the whole Radiative Divertor design team, which is a collaborative effort between several institutions. Work supported by the US Department of Energy under contract nos. W-7405-ENG-48 at LLNL, DE-AC093-89ERS5114 at General Atomics, DE-AC05-84OR21400 at ORNL, DE-AC04-76DP00789 at SNL, and DE-AC07-76ID01570 at INEL.
Funders | Funder number |
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US Department of Energy |