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(Courtesy of JAXA)
200mW at 20K,1W at 100K
80mW at15K,1W at 100K