Thermal Design and Test of IRTS Cryostat
Design study of a small, cooled infrared telescope (IRTS) has been made, which will be launched in 1994 as a payload of the Space Flyer Unit (SFU). It is cooled down to 1.8 K by stored superfluid helium of 100 dm3 for about one month, being capable of IR astrophysical observation even in far infrared region. Minimization of heat leak to the lowest temperature level is one of the primary design goal under various constraints. The application of the reflecting, Winston cone type, forebarrel and the black baffle system composed of the mirrors and the aftbarrel is considered for this purpose as well as for extremely low background. A BBM has been manufactured on the basis of the design study, which is primarily dedicated to a thermal test. The test is under way to obtain the design data for the PFM.
KeywordsSuperfluid Helium Simple Cone Heat Leak Porous Plug Lower Temperature Level
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