At Wendelstein 7-X, the island divertor has been successful in stabilizing detached plasma scenarios and reducing the heat fluxes on divertor targets. This topology has multiple adjacent counter-streaming flow regions that can reduce the flow speed parallel to magnetic field lines, leading to substantial heat flux mitigation. Radiative power exhaust by impurity seeding has been demonstrated in island divertor configurations, resulting in stable plasma operation and reduced divertor heat loads. This makes the island divertor a promising solution for future detachment control in high-performance scenarios and upgrades towards a metal divertor. The edge magnetic structure in quasi-omnigenous and helically symmetric stellarators, like W7-X and HSX, has a significant impact on particle fueling and exhaust. It has been shown that the magnetic island chain can be used to control plasma fueling from the recycling source and active gas injection.
At Wendelstein 7-X, the island divertor has been successful in stabilizing detached plasma scenarios and reducing the heat fluxes on divertor targets. This topology has multiple adjacent counter-streaming flow regions that can reduce the flow speed parallel to magnetic field lines, leading to substantial heat flux mitigation. Radiative power exhaust by impurity seeding has been demonstrated in island divertor configurations, resulting in stable plasma operation and reduced divertor heat loads. This makes the island divertor a promising solution for future detachment control in high-performance scenarios and upgrades towards a metal divertor. The edge magnetic structure in quasi-omnigenous and helically symmetric stellarators, like W7-X and HSX, has a significant impact on particle fueling and exhaust. It has been shown that the magnetic island chain can be used to control plasma fueling from the recycling source and active gas injection.