Thermal design utilizing radiative cooling for the payload module of LiteBIRD

Takashi Hasebe; Shingo Kashima; Satoru Uozumi; Hirokazu Ishino; Shin Utsunomiya; Hirofumi Noda; Kazuhisa Mitsuda; Yutaro Sekimoto; Tadayasu Dotani; Tomotake Matsumura; Hajime Sugai; Masahiro Tsujimoto; Hiroaki Imada; Masashi Hazumi

doi:10.1117/12.2313034

12 July 2018 Thermal design utilizing radiative cooling for the payload module of LiteBIRD

Takashi Hasebe, Shingo Kashima, Satoru Uozumi, Hirokazu Ishino, Shin Utsunomiya, Hirofumi Noda, Kazuhisa Mitsuda, Yutaro Sekimoto, Tadayasu Dotani, Tomotake Matsumura, Hajime Sugai, Masahiro Tsujimoto, Hiroaki Imada, Masashi Hazumi

Author Affiliations +

Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 1069864 (2018) https://doi.org/10.1117/12.2313034
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The conceptual thermal design of the payload module (PLM) of LiteBIRD utilizing radiative cooling is studied. The thermal environment and structure design of the PLM strongly depend on the precession angle α of the spacecraft. In this study, the geometrical models of the PLM that consist of the sunshield, three layers of Vgrooves, and 5 K shield were designed in the cases of α = 45° , 30° , and 5° . The mission instruments of LiteBIRD are cooled down below 5 K. Therefore, heat transfers down to the 5 K cryogenic part were estimated in each case of α. The radiative heat transfers were calculated by using geometrical models of the PLM. The conductive heat transfers and the active cooling with cryocoolers were considered. We also studied the case that the inner surface of the V-groove is coated by a high-emissivity material.

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Takashi Hasebe, Shingo Kashima, Satoru Uozumi, Hirokazu Ishino, Shin Utsunomiya, Hirofumi Noda, Kazuhisa Mitsuda, Yutaro Sekimoto, Tadayasu Dotani, Tomotake Matsumura, Hajime Sugai, Masahiro Tsujimoto, Hiroaki Imada, and Masashi Hazumi "Thermal design utilizing radiative cooling for the payload module of LiteBIRD", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 1069864 (12 July 2018); https://doi.org/10.1117/12.2313034

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