Mechanical cooler system for the infrared space mission SPICA

Keisuke Shinozaki; Yoichi Sato; Chihiro Tokoku; Masaru Saijo; Hiroyuki Ogawa; Takao Nakagawa; Kenichiro Sawada; Hiroyuki Sugita; Tadahito Mizutani; Hideo Matsuhara; Shoji Tsunematsu; Seiji Yoshida; Kenichi Kanao; Akinobu Okabayashi; Katsuhiro Narasaki; Hiroshi Shibai

doi:10.1117/12.2562175

15 December 2020 Mechanical cooler system for the infrared space mission SPICA

Keisuke Shinozaki, Yoichi Sato, Chihiro Tokoku, Masaru Saijo, Hiroyuki Ogawa, Takao Nakagawa, Kenichiro Sawada, Hiroyuki Sugita, Tadahito Mizutani, Hideo Matsuhara, Shoji Tsunematsu, Seiji Yoshida, Kenichi Kanao, Akinobu Okabayashi, Katsuhiro Narasaki, Hiroshi Shibai

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 1144329 (2020) https://doi.org/10.1117/12.2562175
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The Space Infrared Telescope for Cosmology and Astrophysics (SPICA) mission is to be launched into orbit around the second Lagrangian point (L2) in the Sun-Earth system. Taking advantage of the thermal environment in L2, a 2.5m-class large IR telescope is cooled below 8K in combination with effective radiant cooling and a mechanical cooling system. SPICA adopts a cryogen-free system to prevent the mission operation lifetime being limited by the amount of cryogen as a refrigerant. Currently, the mechanical cooler system with the feasible solution giving a proper margin is proposed. As a baseline design, 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 stage 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. In this paper, current baseline configuration of the mechanical cooler system and current status of mechanical coolers developments which need to satisfy the specific requirements of SPICA cryogenic system are presented.

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Keisuke Shinozaki, Yoichi Sato, Chihiro Tokoku, Masaru Saijo, Hiroyuki Ogawa, Takao Nakagawa, Kenichiro Sawada, Hiroyuki Sugita, Tadahito Mizutani, Hideo Matsuhara, Shoji Tsunematsu, Seiji Yoshida, Kenichi Kanao, Akinobu Okabayashi, Katsuhiro Narasaki, and Hiroshi Shibai "Mechanical cooler system for the infrared space mission SPICA", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 1144329 (15 December 2020); https://doi.org/10.1117/12.2562175

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