5.ITER用高熱流束機器(<小特集>熱粒子制御のためのプラズマ対向壁工学)

概要

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This paper presents the latest activities in the development of plasma facing components of ITER, and in particular development of a new divertor plate at JAERI. An ITER divertor plate must be capable of withstanding heat flux of more than 15 MW/m^2 for 10 s in a slow transient period. This requirement had previously met in small-scale divertor mock-ups with unidirectional carbon-fiber-reinforced carbon composite (UD-CFC) armors. In a thermal cycling experiment, however, the pure copper cooling tube proved to be highly vulnerable to thermal fatigue. To increase its fatigue strength, the cooling tube developed for the new divertor plate features a duplex structure, with an outer skin made of pure copper for a better braze performance and an inner core of dispersion strengthened copper (DS-Cu) for a higher strength. In addition, 3D-CFC material having a high thermal conductivity of 500 W/m/K at room temperature and a higher strength than UD-CFC has also been developed to prevent armor materials from cracking due to the high thermal stress during heating period. 3D-CFC armor tiles were bonded onto the DS-Cu tube with silver-free braze material, which meets ITER material requirements. In addition, a real-scale divertor mock-up for a vertical target application has been successfully developed and has withstood ITER slow transient heat loads.
社団法人プラズマ・核融合学会の論文
1997-06-25