Role of Device Size on Island Divertor Performance of W7-X-like Configurations
To examine how the island divertor performs in future low-shear stellarator reactors, we simulate (using EMC3-Eirene [1]) 3 different scales of W7-X: its current size, increased by a factor 2, and increased by a factor 4, where 4 times W7-X corresponds roughly to a reactor-scale device. For a single magnetic configuration, the standard magnetic configuration in W7-X, we examine how increasing the size of W7-X alters the divertor performance of the island divertor. We analyze how device scale shifts the location of the ionization source and the downstream density and temperature trends in the island divertor for achieving detachment. Local field line analysis shows that factor 2 and factor 4 size scalings achieve target densities $>10^{21} \ \mathrm{m}^{-3}$ via plasma ``self-baffling" within the open island divertor geometry. Finally, the heat and particle flux deposition on the scaled-up island divertor configurations are calculated. We observe a separation in the target heat and particle flux distribution with increased machine size in agreement with [2]. The target heat fluxes are $<5 \ \mathrm{MW}/\mathrm{m}^2$ at high separatrix densities. This shows that the separation of the heat and particle flux channels remains to be largely unproblematic. This analysis helps guide how to improve the open island divertor geometries for future stellarator reactors.