High heat flux test of actively cooled tungsten-coated carbon divertor mock-ups

CX-2002U and IG-43OU coated by VPS-W were developed to be as a light high-Z plasma-facing material. After brazing them on OFHC blocks using a Ti foil, their thermal response and thermal fatigue properties were examined with a ctive cooling. No cracks and no exfoliation occurred on the W surface and t he braze interface even after 160 cycles of heat load for 20 s at 10 MW/m(2 ). This result indicates that the Ti-brazing is a possible alternative to A g-brazing for joining carbon to Cu. Heat load resistance of the VPS-W coate d CX-2002U/OFHC was much better than the VPS-W coated IG-430U/OFHC due to t he excellent thermal conductivity of CX-2002U. VPS-W coated CFC/OFHC is a p otential candidate for a high heat resistance armor material on plasma faci ng components. (C) 2000 Elsevier Science B.V. All rights reserved.