Abstract
The multifluid plasma scrape-off layer transport code B2 coupled to the EIRENE Monte Carlo neutral gas transport code was applied to a prototypical island divertor configuration in W7-AS. The approach predicts the accessibility of stable, layer-like energy detachment within a relatively broad density range. The island geometry with typically small field line pitch has the beneficial effects of efficient shielding of the main plasma against neutrals, and of strong momentum losses from the power carrying layer due to momentum radial transport. The latter reduces the peak power load and eases detachment. The power exhaust properties and the onset of detachment can be positively affected by the choice of the field line pitch which can be varied in W7-AS by superimposed control fields.
Published Version
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