Abstract
ASTRO-H is a Japanese X-ray astronomy satellite, scheduled to be launched in fiscal year 2015. The mission includes a soft X-ray spectrometer instrument (SXS), which contains an X-ray micro calorimeter operating at 50mK by using an adiabatic demagnetization refrigerator (ADR). The heat sink of the ADR is superfluid liquid helium below 1.3K. The required lifetime of the superfluid helium is 3years or more. In order to realize this lifetime, we have improved the thermal performance from the engineering model (EM) while maintaining the mechanical performance. Then, we have performed a thermal test of the flight model (FM). The results were that the heat load to the helium tank was reduced to below 0.8mW in the FM from 1.2mW in the EM. Therefore, the lifetime of the superfluid helium is more than 3years with 30L of liquid helium.In this paper, the thermal design and thermal test results are described.
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