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4K/1K Cryocoolers

Heat exchanging part

The 4K cryocooler and the 1K cryocooler are the result of the technological union of the Joule Thomson (JT) cryocooler and the 20K Stirling cryocooler. The JT cryocooler comprises JT compressor, heat exchanger and JT orifice. This 4K cryocooler was adopted for the X-ray astronomical satellite Hitomi (ASTRO-H) launched in 2016.

Items 4K cryocooler (4He) 1K cryocooler (3He)
Cooling capacity 40mW at 4.5K 10mW at 1.7K
JT cryocooler
Power consumption ≤ 50W ≤ 80W
Two-stage Stirling cycle cryocooler
Cooling capacity 200mW at 20K, 1W at 100K 80mW at 15K, 1W at 100K
Power consumption ≤ 90W ≤ 90W
Actual applications on satellite orbits

SMILES (equipped on the International Space Station)

X-ray astronomy satellite Hitomi (ASTRO-H)

Planned launches

X-Ray Imaging and Spectroscopy Mission (XRISM)

Cosmic background radiation observation satellite LiteBIRD

Under development

4K cryocooler and 1K cryocooler for X-ray astronomy satellite Athena

4K cryocooler and 1K cryocooler for infrared astronomy satellite SPICA

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