Electric fields and currents in an island divertor configuration

One candidate for an optimized particle and energy exhaust concept in stellarators is the island divertor. Due to the special topology of such a design, its physics characteristics can be quite different from standard tokamak divertors or Limited Stellarator Plasmas. We have extended the capabilities of the two-dimensional B2-solps5.0 multifluid Scrape-Off layer plasma simulation code to handle diverted island geometries, including all relevant physics, in particular drifts and currents. We focus here on the structure of the electric potential and electric field in this island configuration. We show the establishment of potential and current flow patterns favoring density accumulation inside the island. This electric potential distribution is non-trivial and quite different from the φ=3kT ansatz used in previous studies.