We have constructed a magnetically insulated ion source in which deuterons are extracted from plasma generated by a deuterated titanium washer located within the field excluding anode. Peak beam parameters are 0.8 A/cm2at 140 kV for 0.4 &mgr;sec with a 14‐mm anode‐cathode gap. Faraday cup measurements show significantly fewer impurities in the deuteron beam than in proton beams extracted from surface flashover plasma.