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9 October 2019 Optimization of cryogenic architecture for LiteBIRD satellite using radiative cooling
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Abstract

Radiative cooling with thermal isolation shields can provide a reliable cooling system for instruments onboard satellites in orbit. We report the optimization study for the cryogenic architecture of the LiteBIRD satellite using radiative cooling. A trade study that changed the number of thermal shields and shield emissivity were conducted. The heat flow from 300 to 4.5 K, including active cooling by mechanical cryocoolers, was evaluated among the trade designs. We found that the design that consists of low-emissivity four-layer thermal shields is optimum in terms of thermal performance and system design. The optimum design achieved a heat load of 29.9 mW for the 4.5-K cooling stage, whereas the requirement was 30 mW with the assumed cryogenic system.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 2329-4124/2019/$28.00 © 2019 SPIE
Takashi Hasebe, Yutaro Sekimoto, Tadayasu Dotani, Kazuhisa Mitsuda, Keisuke Shinozaki, and Seiji Yoshida "Optimization of cryogenic architecture for LiteBIRD satellite using radiative cooling," Journal of Astronomical Telescopes, Instruments, and Systems 5(4), 044002 (9 October 2019). https://doi.org/10.1117/1.JATIS.5.4.044002
Received: 15 April 2019; Accepted: 16 September 2019; Published: 9 October 2019
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