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• W4294365712 endingPage "106024" @default.
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• W4294365712 abstract "Abstract Impurity transport modeling of the new tungsten (W)-coated, V-shaped small angle slot (SAS) divertor in the DIII-D tokamak was conducted using the SOLPS-ITER plasma edge code package and the DIVIMP impurity tracking code. The inboard baffle of the current SAS divertor will be shifted closer to the outboard baffle, creating a V-corner at the slot vertex. In addition, the outboard baffle will be coated with 10–15 μ m of W for experiments studying high-Z sourcing and leakage in a closed divertor. Modeling of the ‘SAS-VW’ divertor predicts that these changes to the inner baffle will reduce W gross erosion by 40× relative to the existing SAS divertor when the outer strike point (OSP) is at the V-corner and the ion B × ∇ B drift is towards the divertor, driven primarily by significant cooling near the slot vertex. Most W erosion in SAS-VW is expected to occur near the slot entrance, which may pose a higher risk to core contamination than W eroded deeper in the slot. Adding a new sheath-based prompt redeposition model outlined in Guterl et al (2021 Nucl. Mater. Energy 27 100948) increases the sensitivity of redeposition estimates to near-target plasma conditions and may provide more accurate predictions of net erosion. Moving the OSP outboard from the slot vertex ∼4 cm onto the W-coated region yields a 40× increase in the gross erosion rate and a 50% decrease in the core leakage fraction. Thus slight variations in strike point location may counteract the potential benefits of the tightly-baffled V slot on minimizing erosion. This impurity transport modeling provides useful guidance for future experiments on the SAS-VW divertor focused on high-Z erosion/redeposition, scrape-off layer transport, and core leakage." @default.
• W4294365712 created "2022-09-03" @default.
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• W4294365712 date "2022-09-13" @default.
• W4294365712 modified "2023-10-12" @default.
• W4294365712 title "Predicting tungsten erosion and leakage properties for the new V-shaped small angle slot divertor in DIII-D" @default.
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• W4294365712 doi "https://doi.org/10.1088/1741-4326/ac8b95" @default.
• W4294365712 hasPublicationYear "2022" @default.
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