The National Astronomical Observatory of Japan (NAOJ) is building a superlative 8.2 meter optical-infrared telescope at the summit of Mauna Kea in Hawaii. This SUBARU telescope has seen first-light early in 1999. Observational instruments are mounted at the foci of the Subaru Telescope and analyze the light collected by the primary mirror. We developed three kinds of cooling systems for the infrared observational instruments, in cooperation with the National Astronomical Observatory. The cooling system of COMICS (Cooled Mid Infrared Camera and Spectrometer) needs to cool an infrared detector to very low temperature. We applied the technology used for the space infrared telescope, and developed the very low temperature cooling system with large-sized and very high stiffness.
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