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Mechanical Cooler below 4.5K

4K-class cooler is combination of a JT cooler and a double-stage Stirling Cooler. The JT cooler consists of JT compressors, heat exchangers and JT orifice. 4K-class cooler is adopted to ASTRO-H/SXS to be launched in 2014.

ISS/Kibo(JEM)/SMILES

4K cooler system

ISS/Kibo(JEM)/SMILES(Courtesy of JAXA)

  
Specifications
Items 4K-class Cooler (4He) 1K-class Cooler (3He)
Cooling Capacity 20mW at 4.5K 10mW at 1.7K
JT Cooler
Power comsumption ≤50W ≤80W
Double-stage Stirling Cooler
Cooling Capacity

200mW at 20K,1W at 100K

80mW at15K,1W at 100K

Power comsumption ≤90W ≤90W
Heritage ISS/Kibo(JEM)/SMILES 2009/09～ in orbit Labo test of the bread board adopted to SPICA





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