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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Port structure in the JT-60SA is designed to access vacuum vessel inside for vacuum exhausts, plasma heating
systems and diagnostics etc. from cryostat outside. The port consists of a rectangular pipe, bellows and additional
materials such as electrical insulations and connection parts for onsite assembly. The vacuum space as the
thermal insulation for superconducting coils is penetrated by the port as the vacuum interfaces between the
vacuum vessel and the cryostat so that port structure is required to be structurally integrated against plasma and
baking operations and accidental events. This structure must be installed in narrow space, and electrical insulation
is functionally designed to avoid the unexpected large eddy current loop. This paper reports the design
of port connection structure for the assembly. Port connection parts “Port Extension” and “adjustable plate” are
introduced to absorb vertical of 10 mm, toroidal of 8 mm, and port axial of 10mm error due to the manufacturing
and assembly. The bellows are expected to absorb relative displacement of 39mm only between the
vacuum vessel and the cryostat during the operation. The structure is confirmed to withstand the load conditions
because stress is estimated to be lower than allowable level by FEM analysis.
Design of port structure between vacuum vessel and cryostat in JT-60SA
