Innovative cryogenic system for Japanese infrared astronomical mission "spica"

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

Research output: Contribution to conferencePaperpeer-review

Abstract

Since the next cryogenic infrared mission "JAXA-SPICA" employs advanced mechanical cryocoolers with effective radiant cooling in place of cryogen, the primary mirror, 3.5 m in diameter, and the optical bench can be maintained at 4.5 K for at least 5 years. First, the feasibility of the thermal design of the cryogenic system is presented. A 20K-class Stirling cryocooler was then improved in cooling capacity and reliability for the mission, and the effects of contaminated working gas or new regenerator materials on cooling performance were investigated. Development of a new 3He-JT (Joule-Thomson) cryocooler for use at 1.7 K is also described, along with the successful results of a cooling capacity higher than the required 10 mW. A 4K-class cryocooler was modified and developed for higher reliability over a five-year operational life and a higher cooling capacity exceeding the current 30 mW. Finally, we discuss a system for heat rejection from cryocoolers using thermal control devices.

Original languageEnglish
Pages633-641
Number of pages9
Publication statusPublished - 2005 Dec 1
EventInternational Astronautical Federation - 56th International Astronautical Congress 2005 - Fukuoka, Japan
Duration: 2005 Oct 172005 Oct 21

Other

OtherInternational Astronautical Federation - 56th International Astronautical Congress 2005
CountryJapan
CityFukuoka
Period05/10/1705/10/21

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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