Abstract
A cooled infra-red telescope (IRTS) is planned to be launched in 1993, which will be accommodated to the Space Flyer Unit (SFU). It is cooled down to 1.8 K by 100 dm 3 of stored superfluid helium, being capable of photometric observation even in sub-millimetre regions. The cooled mission life time is required to be longer than several weeks. Minimization of heat leak to the lowest temperature level is one of the primary design goals for maximum life time. The liquid cryogen management in the zero-g situation is another key item. The ground operation at the launching site should also be well planned, especially in liquid helium treatment.
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