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Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..613.1061s&link_type=abstract
ADVANCES IN CRYOGENIC ENGINEERING: Proceedings of the Cryogenic Engineering Conference - CEC. AIP Conference Proceedings, Volum
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Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment, Spaceborne And Space Research Instruments, Apparatus, And Components, Space-Based Ultraviolet, Optical, And Infrared Telescopes
Scientific paper
Large, advanced space telescopes are being planned by NASA to extend the exploration of the universe into far infrared and X-ray wavelengths. The detectors for these telescopes will require active, long-life, vibration free refrigeration at temperatures of 10 K and below. Smaller, more efficient, lower temperature mechanical cryocoolers will be needed to support these missions. Technology is being developed to reduce the size and power for turbo-Brayton cryocoolers in order to address the unique requirements of these advanced instruments. Key features in a turbo-Brayton cooler include miniature, gas-bearing turbomachines and very high effectiveness heat exchangers. At reduced temperatures, these components must incorporate increasingly smaller geometric features in order to achieve the needed levels of efficiency. Developmental plans include radical reductions in the sizes of some of these machines, the development of a miniature cryogenic compressor, and interfacing a turbo-Brayton cooler with lower temperature cooling stages to achieve temperatures in the millikelvin range. This paper discusses several system arrangements that are being considered to address these new applications. Key cryocooler developments will be described, and the results from recent tests will be presented. .
McCormick John A.
Swift Walter L.
Zagarola Mark V.
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