@inproceedings{ab49f8d016ba44278fc96b45e91516bc,
title = "Thermal design utilizing radiative cooling for the payload module of LiteBIRD",
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.",
keywords = "CMB, LiteBIRD, Radiative cooling, Thermal design, V-grooves",
author = "Takashi Hasebe and Shingo Kashima and Satoru Uozumi and Hirokazu Ishino and Shin Utsunomiya and Hirofumi Noda and Kazuhisa Mitsuda and Yutaro Sekimoto and Tadayasu Dotani and Tomotake Matsumura and Hajime Sugai and Masahiro Tsujimoto and Hiroaki Imada and Masashi Hazumi",
note = "Funding Information: We thank Mike DiPirro, Thierry Tirolien, Lucile Desjonqueres, Hiroyuki Ogawa, and Keisuke Shinozaki for valuable discussions related to this study. This work was supported by ISAS/JAXA phase A1 program and acceleration program of JAXA research and development directorate. This work was partially JSPS/MEXT KAKENHI Grant Numbers JP17H01115 and JP15H05891. Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave ; Conference date: 10-06-2018 Through 15-06-2018",
year = "2018",
doi = "10.1117/12.2313034",
language = "English",
isbn = "9781510619494",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Fazio, {Giovanni G.} and MacEwen, {Howard A.} and Makenzie Lystrup",
booktitle = "Space Telescopes and Instrumentation 2018",
}