We are developing a cryogenic helium system to provide cooling to a scanning infrared telescope for the Spacelab 2 mission in 1982. The, infrared optical/detector system and related electronics are being developed by the Smithsonian Astrophysical Observatory and the University of Arizona. A superfluid helium dewar and porous plug phase separator permit gas cooling of the infrared focal plane assembly to about 2.5K, and of the two telescope sections to 8K and 60K respectively. In this paper the design of the cryogenic system, including a commandable vacuum cover, and the prelaunch liquid helium servicing and maintenance approach will be discussed. The system can be readily adapted to other types of cryogenic experiments on later Spacelab missions.
E. W. Urban,
J. B. Hendricks,
G. R. Karr,
"Spacelab 2 Infrared Telescope Cryogenic System", Proc. SPIE 0183, Space Optics II, (27 September 1979); doi: 10.1117/12.957395; https://doi.org/10.1117/12.957395