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A Cryogenic Stabilization Scheme for Radio Astronomy Applications

[+] Author Affiliations
Michael J. Smith, Raymond Blundell

Harvard-Smithsonian Center for Astrophysics, Cambridge, MA

Paper No. IMECE2009-11193, pp. 549-552; 4 pages
doi:10.1115/IMECE2009-11193
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

We report on a scheme to stabilize short term cryogenic temperature variations in equipment used for high frequency radio telescope receivers. A 45.9 cm3 copper helium pot is affixed to a Sumitomo/Daikin 308, GM/JT cold head. 5.7×103 cm3 of helium gas is introduced at the end of the cooling cycle and condensation until zero kPaa is reached. Short term temperature stabilization is achieved through the specific heat of the liquefied helium diminishing thermal deviations up to 46%.

Copyright © 2009 by ASME

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