量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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National Institutes for Quantum and Radiological Science and Technology (QST) reports progress of research and development of a full-tungsten (W) Divertor Outer Vertical Target (OVT) for ITER. Under a framework of a W divertor qualification program, QST manufactured 7 full-scale plasma-facing units (PFUs) as prototypes. Through the manufacturing, (i) all joint surfaces in four PFUs with a casted Cu interlayer successfully passed the ultrasonic testing (UT) and (ii) the profile tolerance of surface in target part of PFUs stayed within ± 0.25 mm. (iii) Moreover QST succeeded in demonstrating a durability for high heat flux (HHF) testing of the repetitive heat load of 10 MW/m2 × 5000 cycles and 20 MW/m2 × 1000 cycles in close collaboration with the ITER organization (IO-CT) and the Russian Domestic Agency (RFDA). These results demonstrated the capability of Japanese industry to produce the PFU of full-W ITER divertor to meet the technical requirements.
Progress of Qualification Testing for Full-Scale Plasma-Facing Unit Prototype of Full Tungsten ITER Divertor in Japan
