Mechanical design of experimental apparatus for FIREX cryo-target cooling

9th International Conference on Inertial Fusion Sciences and Applications

Iwamoto, A.^1 ; Norimatsu, T.^2 ; Nakai, M.^2 ; Sakagami, H.^1 ; Fujioka, S.^2 ; Shiraga, H.^2 ; Azechi, H.^2

National Institute for Fusion Science, Toki, Gifu, Japan^1

Institute of Laser Engineering, Osaka University, Suita, Osaka, Japan^2

关键词: Cryogenic environment;    Experimental apparatus;    Gaseous helium;    Laser fusion experiments;    Loading system;    Mechanical design;    Sealing performance;    Sealing system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012098/pdf
DOI  :  10.1088/1742-6596/717/1/012098

来源: IOP

【 摘 要 】

Mechanical design of an experimental apparatus for FIREX cryo-target cooling is described. Gaseous helium (GHe) sealing system at a cryogenic environment is an important issue for laser fusion experiments. The dedicated loading system was designed for a metal gasket. We take U-TIGHTSEAL® (Usui Kokusai Sangyo Kaisha. Ltd.) with an indium plated copper jacket as an example. According to its specification, a linear load of 110 N/m along its circumference is the optimum compression; however a lower load would still maintain helium (He) leak below the required level. Its sealing performance was investigated systematically. Our system demanded 27 N/mm of the load to keep He leak tightness in a cryogenic environment. Once leak tightness was obtained, it could be reduced to 9.5 N/mm.