General Cryopumping Study

  • E. S. J. Wang
  • J. A. CollinsJr.
  • J. D. Haygood
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 7)

Abstract

A great deal of enthusiasm has been generated in recent years over the attainment of ultrahigh vacuums by immobilizing or freezing gas molecules onto a cold surface in a closed system. This interest is mainly the result of the pumping requirements for space environmental simulation chambers of large capacity, that is, in the pressure range of 10-7 to 10-13 mmHg. However, the problem of attaining a high vacuum in a reasonably short time and of maintaining such a vacuum, if obtained, is a serious one in view of the outgassing characteristics of the materials inside the system and of the metal retainer walls, as well as the inevitable in-leakage to the system from the atmosphere. The volume of gases which must be pumped to maintain a vacuum of the magnitude of 10-7 to 10-13 mm Hg is, in many cases, very great, and the necessary size of the mechanical pumping facilities must be correspondingly enormous. (For example, the pump load of the forthcoming Mark I space simulation chamber to be built at the Arnold Center is estimated to be 100,000,000 liters/sec at 10-7 mm Hg [1].) In order to design and fabricate vacuum chambers of such size, the use of cryopumping or the cryogenic pumping technique has been considered and, in most cases, adopted as a general design requirement. This cryogenic technique for vacuum pumping has been proved to be more practical and economical than the mechanical pumping methods, according to several studies [2, 3, 4, 5].

Keywords

Cold Trap Cold Surface Free Molecular Flow Capture Coefficient Trapping Phenomenon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    D.D. Carlson and R.H. Underwood, “Design of an Aero-space Systems Environmental Chamber” AEDC-TR-61–10 (July, 1961).Google Scholar
  2. 2.
    B. Bailey and R.L. Chuan, “Cryopumping for High Vacuum with Low Power,” Transactions of the 1958 Vacuum Symposium, Am. Vacuum Soc., October 22–24 (1958).Google Scholar
  3. 3.
    W. W. Balwanz, “Space Simulation with a High Pumping Rate System,” Naval Research Laboratory Progress Report, 00–14–20 (October, 1959),Google Scholar
  4. 4.
    E. K. Latvaia and E. S.J. Wang, “Vacuum Pumping Methods for Space Chambers,” presented at the Second Symposium on Rocket Testing in Simulated Space and High Altitude Environments, Arnold Eng. Development Center (June, 1961).Google Scholar
  5. 5.
    G. S. Hollister, R. T. Brackmann, and W. L. Fite, “The Use of Modulated Atomic-Beam Techniques for the Study of Space Flight Problems,” General Atomic Div., General Dynamics Corp., OSR-TN-59–1033 (October, 1959).Google Scholar
  6. 6.
    R.W. Moore Jr., “A Study of Cryopumping with Noncondensable Removal,” USCEC Rept. 83–205, AGOSR 561 (March, 1961).Google Scholar
  7. 7.
    W.F. Claussen, “Suggested Structures of Water in Inert Gas Hydrates,” J. Chem. Phys. Vol. 19, 259 (1951).CrossRefGoogle Scholar
  8. 7a.
    W.F. Claussen, “Suggested Structures of Water in Inert Gas Hydrates,” J. Chem. Phys. Vol. 19, 662 (1951).CrossRefGoogle Scholar
  9. 7b.
    W.F. Claussen, “Suggested Structures of Water in Inert Gas Hydrates,” J. Chem. Phys. Vol. 19, 1425 (1951).CrossRefGoogle Scholar
  10. 8.
    L. Pauling, “A Molecular Theory of General Anesthesia,” Science, Vol. 134, No. 3471, 15–21 (July 7, 1961).CrossRefGoogle Scholar
  11. 9.
    L. Pauling and R. E. Marsh, “The Structure of Chlorine Hydrate,” Proceedings of the National Academy of Science, U.S. 38, 112 (1952).Google Scholar
  12. 10.
    A.R. Miller, The Adsorption of Gases on Solids, Cambridge University Press, London (1949).Google Scholar

Copyright information

© Springer Science+Business Media New York 1962

Authors and Affiliations

  • E. S. J. Wang
    • 1
  • J. A. CollinsJr.
    • 1
  • J. D. Haygood
    • 1
  1. 1.ARO, Inc.Arnold Air Force StationUSA

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