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Outgas analysis of mechanical cryocoolers for long lifetime

Nakagawa, Takao; Mitsuda, Kazuhisa; Kanao, Kenichi +9 more

Mechanical cryocoolers for space applications are required to have high reliability to achieve long-term operation in orbit. ASTRO-H (Hitomi), the 6th Japanese X-ray astronomy mission, has a major scientific instrument onboard-the Soft X-ray Spectrometer (SXS) with several 20K-class two-stage Stirling (2ST) coolers and a 4K-class Joule Thomson (JT…