Space cryogenic system for SPICA mission

Hiroyuki Sugita, Hiroki Nagai, Takao Nakagawa, Hiroshi Murakami, Toshio Matsumoto, Masahide Murakami, Katsuhiro Narasaki, Masayuki Hirabayashi

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


This paper describes that the feasibility of the next Japanese infrared astronomical SPICA mission is verified in thermal design by numerical analyses and developed technologies. In this advanced cryogenic mission, in order to cool the large primary mirror and focal plane instruments down to 4.5 K for 5 years or longer without cryogen, the mechanical cooling is employed with effective radiant cooling, which compensates the limited cooling capacity of the JT cryocooler for 4.5 K upgraded from that developed for the "JEM/SMILES" mission on the International Space Station. First, thermal design of the telescope is numerically discussed with thermal mathematical models. Some configurations of radiators, shields and solar-array paddles are investigated and compared in technical and mission feasibilities. Next, the development status of the 3He-JT circuit with the Stirling cryocooler for one detector operated at the lowest temperature of 1.7 K is reported. The recent results of experiments give that the breadboard model of the 1.7 K cryocooler successfully exceeds the required cooling capacity of 10mW at 1.7K with small power consumption. Finally, the heat rejection system from those cryocoolers is discussed. As a promising candidate, the loop heat pipe is chosen and suitably designed.

Original languageEnglish
Pages (from-to)1625-1633
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 3
Publication statusPublished - 2004 Dec 20
Externally publishedYes
EventOptical, Infrared, and Millimeter Space Telecopes - Glasgow, United Kingdom
Duration: 2004 Jun 212004 Jun 25


  • 1.7K
  • 2-stage Stirling cooler
  • 4.5 K
  • He-JT circuit
  • Loop heat pipe
  • Radiant cooling
  • Space IR telescope

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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