In the divertor of ITER, carbon and tungsten are employed as plasma facing materials. After the machine operation, these materials are mixed as a result of erosion and deposition. Then, both deuterium retention and chemical erosion differ from graphite or tungsten only.
In the present study, carbon tungsten mixed material with different composition was irradiated by deuterium ions, and followed by deuterium retention and chemical erosion were examined. Deuterium retention decreased with increase of tungsten concentration but the decreasing ratio was not so large as predicted. Chemical erosion was considerably reduced as increase of tungsten concentration.
