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Article Dans Une Revue Nuclear Materials and Energy Année : 2021

3D modeling of boron transport in DIII-D L-mode wall conditioning experiments

Résumé

DIII-D L-mode experiments with local boron powder injection for real-time wall conditioning have been interpreted for the first time with the 3D plasma edge transport Monte Carlo code EMC3-EIRENE. Local B sourcing in plasma scenarios with upstream densities 1.5 ⋅ 10^19 m −3 and 2.2 MW heating results in a nonaxisymmetric B distribution in the scrape-off layer (SOL) and on the divertor. The SOL frictional flows at high plasma density cause a strong inboard drag of injected impurities (≈ 90%), while lower background plasma densities tend to result in a more uniform distribution. The thermal forces prevent B deposition in the near SOL while the frictional force causes B fluxes to cover the divertor plasma-facing components in a region 7-10 cm beyond the strike line. Radiative dissipation occurs for B influxes above 1 ⋅ 10^20 s −1 and causes a moderate, non-axisymmetric reduction of the far SOL divertor heat fluxes. A comparison of top and midplane B injection shows no substantial difference in inboard vs. outboard asymmetries of the B distribution. On the other hand, erosion or recycling at the strike line may distribute the boron more uniformly in the SOL.
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Dates et versions

hal-03741021 , version 1 (31-07-2022)

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Florian Effenberg, A. Bortolon, H. Frerichs, B. Grierson, J.D. Lore, et al.. 3D modeling of boron transport in DIII-D L-mode wall conditioning experiments. Nuclear Materials and Energy, 2021, 26, pp.100900. ⟨10.1016/j.nme.2021.100900⟩. ⟨hal-03741021⟩
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