The island divertor has been proposed for power and particle exhaust in stellarators.It is investigated in the Wendelstein 7-X (W7-X) experiment.The divertor capabilities such as particle exhaust or radiative power dissipation scale with the divertor density.
However, significantly lower divertor density has been obtained in W7-X in comparison to tokamaks and Hockey Protective - Shoulder Pads - Youth no high-recycling scaling is observed.To alleviate the impact of the complicated geometry, a simplified geometry model COLLOIDAL SILICEA for the island divertor in EMC3-EIRENE is developed and used to investigate the effect of the divertor target geometry.We show that compared to the open divertor, a closed divertor geometry leads to higher achievable densities and in particular a much stronger scaling of the target density with respect to the separatrix density.