Mechanical cooler system for the next-generation infrared space telescope SPICA

Keisuke Shinozaki; Hiroyuki Ogawa; Takao Nakagawa; Yoichi Sato; Hiroyuki Sugita; Toshihiko Yamawaki; Tadahito Mizutani; Hideo Matsuhara; Mitsunobu Kawada; Akinobu Okabayashi; Shoji Tsunematsu; Katsuhiro Narasaki; Hiroshi Shibai

doi:10.1117/12.2232602

29 July 2016 Mechanical cooler system for the next-generation infrared space telescope SPICA

Keisuke Shinozaki, Hiroyuki Ogawa, Takao Nakagawa, Yoichi Sato, Hiroyuki Sugita, Toshihiko Yamawaki, Tadahito Mizutani, Hideo Matsuhara, Mitsunobu Kawada, Akinobu Okabayashi, Shoji Tsunematsu, Katsuhiro Narasaki, Hiroshi Shibai

Author Affiliations +

Proceedings Volume 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave; 99043W (2016) https://doi.org/10.1117/12.2232602
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

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.

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Keisuke Shinozaki, Hiroyuki Ogawa, Takao Nakagawa, Yoichi Sato, Hiroyuki Sugita, Toshihiko Yamawaki, Tadahito Mizutani, Hideo Matsuhara, Mitsunobu Kawada, Akinobu Okabayashi, Shoji Tsunematsu, Katsuhiro Narasaki, and 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); https://doi.org/10.1117/12.2232602

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