Development of divertor high heat flux components at JAERI

Recent progress on the development of new divertor high heat flux components in JAERI is presented in this paper. Small-scale divertor mock-up was tested in PBEF (Particle Beam Engineering Facility). The mock-up has armor tiles made of 3D carbon-fiber-reinforced carbon composite (CFC) brazed onto a cooling tube made of dispersion-strengthened copper (DSCu) with a silver-free material. In the thermal cycling experiment, the mock-up could survive from the cyclic thermal load of 20 MW/m². In addition, the divertor mock-up with CVD-W armors also could survive from the cyclic thermal load of 5 MW/m² for 1000 cycles. For the development of real-scale divertor mockups, the real-scale vertical target mock-ups were successfully developed and tested. The armor tiles were made of unidirectional CFC and the cooling tube was made of DSCu. At a heat flux of 20 MW/m², the mock-up with DSCu cooling tube could withstand 1,000 thermal cycles without any evidence of thermal fatigue of the cooling tube