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- W1998744260 abstract "The survivability of dust being transported in the magnetized sheath near the divertor plate of a tokamak and its impact on the desired balance of erosion and redeposition for a steady-state reactor are investigated. Two different divertor scenarios are considered. The first is characterized by an energy flux perpendicular to the plate q0≃1 MW/m2 typical of current short-pulse tokamaks. The second has q0≃10 MW/m2 and is relevant to long-pulse machines like ITER or Demonstration Power Plant. It is shown that micrometer dust particles can survive rather easily near the plates of a divertor plasma with q0≃1 MW/m2 because thermal radiation provides adequate cooling for the dust particle. On the other hand, the survivability of micrometer dust particles near the divertor plates is drastically reduced when q0≃10 MW/m2. Micrometer dust particles redeposit their material non-locally, leading to a net poloidal mass migration across the divertor. Smaller particles (with radius ∼0.1 μm) cannot survive near the divertor and redeposit their material locally. Bigger particle (with radius ∼10 μm) can instead survive partially and move outside the divertor strike points, thus causing a net loss of divertor material to dust accumulation inside the chamber and some non-local redeposition. The implications of these results for ITER are discussed." @default.
- W1998744260 created "2016-06-24" @default.
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- W1998744260 date "2014-02-01" @default.
- W1998744260 modified "2023-10-09" @default.
- W1998744260 title "Survivability of dust in tokamaks: Dust transport in the divertor sheath" @default.
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- W1998744260 doi "https://doi.org/10.1063/1.4864190" @default.
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