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Low temperature detectors are useful for sensitive astronomical observation. We have developed various space-borne cryocoolers for low temperature detectors. In 1995, a new detector was invented, which was made of superconducting thin film and required temperatures below 1K. It is planed that the detector will be equipped in the next X-ray telescope satellite. Mechanical cryocoolers can not reach such temperatures. Therefore, We have developed an adiabatic demagnetization refrigerator that utilizes the magnetic interaction. The refrigerator consists of a superfluid helium tank, a gas gap heat switch, a salt pill and a superconductive magnet assembly. Under the adiabatic demagnetization test of the device, the salt pill was cooled down to 1.3 K by superfluid helium under a magnetic field of 2T. 47mK was achieved in experiments as the lowest temperature.
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