Abstract
Flowing liquid walls have been proposed as the first wall and/or divertor plates for magnetic fusion energy devices because they may solve a number of technological problems for fusion power plants. A key question for their successful use is the edge-plasma shielding of wall-vapor impurities from the core plasma. A self-consistent analysis of the combined hydrogen/impurity edge plasmas for distributed wall impurity sources is performed using the two-dimension fluid transport code UEDGE for tokamak parameters. Three regimes of edge-plasma response are identified. Comparisons are made between previous results for lithium (from Li or SnLi walls) and fluorine (from the molten salt Flibe walls), and new results for Sn (from Sn walls). Owing to its lower vapor pressure, Sn is found to have the lowest impact on the edge and core plasma. For the Sn wall, the effects of toroidal versus slab geometries are studied, as well as the influence of spatial variations in evaporation fluxes.
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