Continuous Flow Cryogen Sublimation Cooler

  • R. C. Longsworth
  • A. Khatri
Part of the A Cryogenic Engineering Conference Publication book series (ACRE, volume 41)


A new technique has been developed that permits temperatures below the triple point to be maintained continuously when liquid cryogen is fed to a special cold stage that vents to vacuum. The technology has been demonstrated using hydrogen which has been liquefied by a Displex GM refrigerator and fed to the cold stage at pressures ranging from 0.1 to 0.5 MPa. With no heat load applied the temperature remained constant at 9.7 K independent of pressure. The temperature and sublimation rate increased when heat was applied. This paper describes the device that was tested and presents a theoretical model which explains the results.


Capillary Tube Triple Point Heat Load Heat Flow Rate Cold Stage 
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  1. 1.
    J. J. Wu, S. Bard, W. Boulter, J. Rodriguez and R. C. Longsworth, “Experimental Demonstration of a 10 K Sorption Cryocooler Stage”, Advances In Cryogenic Engineering, Vol. 39, Plenum Press, New York, 1994Google Scholar
  2. 2.
    R. C. Longsworth and A. N. Khatri, “Continuous Flow Cryogen Sublimation Cooler”, U. S. Patent 5,385,027, Jan. 31, 1995Google Scholar

Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • R. C. Longsworth
    • 1
  • A. Khatri
    • 1
  1. 1.APD Cryogenics IncAllentownUSA

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