Feasibility Study of the Mechanical Cooler System for LiteBIRD

LiteBIRD is the second strategic large-class mission of JAXA aiming to test inflation models. In this mission, cryogenic telescopes and low-temperature scientific instruments are needed to provide high-sensitivity. A mechanical cooler system will cool these telescopes to 5 K or lower, using the 4K-c...

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Bibliographic Details
Published in:Cryogenics (Guildford) Vol. 152; p. 104216
Main Authors: Shinozaki, Keisuke, Odagiri, Kimihide, Yoshihara, Keisuke, Sekimoto, Yutaro, Dotani, Tadayasu, Fujimoto, Ryuichi, Narasaki, Katsuhiro, Yoshida, Seiji, Tsunematsu, Shoji, Isshiki, Masahito, Kanao, Kenichi
Format: Journal Article
Language:English
Published: Elsevier Ltd 15.12.2025
Subjects:
Cryogenics
Joule Thomson
LiteBIRD
Mechanical cooler
Stirling
Joule Thomson
Stirling
Mechanical cooler
Cryogenics
LiteBIRD
ISSN:0011-2275
Online Access:Get full text
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Summary:LiteBIRD is the second strategic large-class mission of JAXA aiming to test inflation models. In this mission, cryogenic telescopes and low-temperature scientific instruments are needed to provide high-sensitivity. A mechanical cooler system will cool these telescopes to 5 K or lower, using the 4K-class Joule Thomson cooler (4K-JT) that provides 4.5 K and the 2K Joule Thomson cooler (2K-JT) that provides 1.7 K, which serve as the precoolers of the multistage adiabatic demagnetization refrigerator (ADR). The 20K-class double-stage Stirling coolers (2ST) are also used as precoolers for the JT coolers and shield coolers. This paper presents a feasibility study of the mechanical cooler system and the status of these cooler developments. •A cryogen-free mechanical cooler system is proposed for the LiteBIRD payload module.•The 4K-JT provides 4.5 K and the 2K-JT provides 1.7 K.•The heat exchanger length is proposed based on the cooling performance test.•The heater control is needed at the 2K-JT cold tip and the 1.75 K stage to satisfy a required temperature stability.•The 2ST compressor was upgraded to prevent a mechanical wear and reduce a vibration levels.
ISSN:0011-2275
DOI:10.1016/j.cryogenics.2025.104216