29 July 2016 Mechanical cooler system for the next-generation infrared space telescope SPICA
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The Space Infrared Telescope for Cosmology and Astrophysics (SPICA) is a pre-project of JAXA in collaboration with ESA to be launched in the 2020s. The SPICA mission is to be launched into a halo orbit around the second Lagrangian point in the Sun-Earth system, which allows us to use effective radiant cooling in combination with a mechanical cooling system in order to cool a 2.5m-class large IR telescope below 8K. Recently, a new system design in particular thermal structure of the payload module has been studied by considering the technical feasibility of a cryogenic cooled telescope within current constraints of the mission in the CDF (Concurrent Design Facility) study of ESA/ESTEC. Then, the thermal design of the mechanical cooler system, for which the Japanese side is responsible, has been examined based on the CDF study and the feasible solution giving a proper margin has been obtained. As a baseline, 4K / 1K-class Joule-Thomson coolers are used to cool the telescope and thermal interface for Focal Plane Instruments (FPIs). Additionally, two sets of double stirling coolers (2STs) are used to cool the Telescope shield. In this design, nominal operation of FPIs can be kept when one mechanical cooler is in failure.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Keisuke Shinozaki, Keisuke Shinozaki, Hiroyuki Ogawa, Hiroyuki Ogawa, Takao Nakagawa, Takao Nakagawa, Yoichi Sato, Yoichi Sato, Hiroyuki Sugita, Hiroyuki Sugita, Toshihiko Yamawaki, Toshihiko Yamawaki, Tadahito Mizutani, Tadahito Mizutani, Hideo Matsuhara, Hideo Matsuhara, Mitsunobu Kawada, Mitsunobu Kawada, Akinobu Okabayashi, Akinobu Okabayashi, Shoji Tsunematsu, Shoji Tsunematsu, Katsuhiro Narasaki, Katsuhiro Narasaki, Hiroshi Shibai, Hiroshi Shibai, } "Mechanical cooler system for the next-generation infrared space telescope SPICA", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99043W (29 July 2016); doi: 10.1117/12.2232602; https://doi.org/10.1117/12.2232602


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