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Okayama Astrophysical Observatory
The Encyclopedia of Astronomy and Astrophysics
A BSTRACT An advanced two-stage Stirling (2ST) cryocooler has been developed for the cryogenic systems of future astronomical and Earth-observation missions in JAXA. The key near-term focus, SPICA, is a Japanese infrared space telescope with a primary mirror of 3.5 m diameter and an optical bench to be maintained at 4.5 ¶K for over 5 years via radiant and mechanical cooling. The temperature of 4.5 ¶K is achieved using a Joule-Thomson (JT) circuit combined with the 2ST cryocooler for precoolingdoi:10.1888/0333750888/4288 fatcat:i2t6taycnzewxfs2xwff2bdpui