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Radiative and hybrid cooling of infrared space telescopes
Authors:Timothy G. Hawarden  Robert Crane  Harley A. Thronson Jr.  Alan J. Penny  Anna H. Orlowska  Thomas W. Bradshaw
Affiliation:(1) Joint Astronomy Center, 660 North A'ohoku Place, University Park, 96720 Hilo, Hawaii, USA;(2) Dept. of Engineering, University of Wyoming, P O Box 3905, 82071 Laramie, Wyoming, USA;(3) Dept. of Physics and Astronomy, University of Wyoming, P O Box 3905, 82071 Laramie, Wyoming, USA;(4) Daresbury Rutherford Appleton Laboratory, Chilton, OX11 0QX Didcot, UK;(5) Present address: Ford Motor Company, Lansing, Mich., USA
Abstract:
The designs of cold space telescopes, cryogenic and radiatively cooled, are similar in most elements and both benefit from orbits distant from the Earth. In particular such orbits allow the anti-sunward side of radiatively-cooled spacecraft to be used to provide large cooling radiators for the individual radiation shields. Designs incorporating these features have predictedTtel near 20 K. The attainability of such temperatures is supported by limited practical experience (IRAS, COBE). Supplementary cooling systems (cryogens, mechanical coolers) can be advantageously combined with radiative cooling in hybrid designs to provide robustness against deterioration and yet lower temperatures for detectors, instruments, and even the whole telescope. The possibility of such major additional gains is illustrated by the Very Cold Telescope option under study forEdison, which should offerTtelle5 K for a little extra mechanical cooling capacity.
Keywords:Space Telescopes  Infrared  Radiative Cooling  Hybrid cooling
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