Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000isass..14..315m&link_type=abstract
The Institute of Space and Astronautical Science Report SP No. 14, p.315-321.
Astronomy and Astrophysics
Astronomy
Onboard Cryogenic Cooling System, Cooled Infrared Telescope, Stirling Refrigerator, 3He Joule-Thomson Refrigerator, Helium Gas Compressor
Scientific paper
This paper describes the general considerations for the design of the cryogenic system for HII/L2 Mission (SPICA) operated at the baseline temperature of 4.5K and at the lowest temperature of 1.7K during the cold mission life of 5 years or longer. The characteristic feature of the system design lies in the He II-free cryogenic system to allow the elimination of a bulky vacuum-tight outer shell, which, in turn, makes it possible to give sufficient room for a large telescope mirror and a longer cold mission life. The cryogenic cooling capability relies on closed-cycle mechanical cryocoolers and radiator. A possible cryogenic design that fulfills the cryogenic requirement for the mission is presented here. In addition, the present status of available space cryogenic technology is reviewed and the required technical development plan is also discussed for the design consideration including the overview design and cryogenic components.
Murakami Masaaki
Narasaki A. K.
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