Design and development of cryogenic pumping evaluation facility
Albero, Carl M.
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A cryogenic pump is a cold surface employed to remove large volumes of gases from a vacuum system by condensing and freezing the gas molecules. Experimental results are presented for the cryopumping rate of carbon dioxide gas on a surface cooled by liquid nitrogen, and for nitrogen gas on a surface cooled by liquid helium. The nature of the problems encountered in the design and construction of a cryogenic pumping system are also discussed.
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Everly, Vernon Richard (Monterey, California. Naval Postgraduate School, 1967-09);Capture coefficients were measured for nitrogen, carbon dioxide and argon as a function of gas flow time in order to determine whether a bare surface effect existed. The effect was observed only with 300K nitrogen on a 20K ...
Dougherty, Charles E. (Monterey, California: U.S. Naval Postgraduate School, 1963);Concepts drawn from the kinetic theory of gases have been utilized to examine basic phenomena associated with cryopumping and low density flow. Relationships based on conductance have been used to examine the significance ...
Tedeschi, Louis Carmelo (1966-05);Capture coefficients of CO- and N were measured on a flat cryopanel. The cryopumping of 300°K CO ©a an 85 °K surface resulted in a capture coefficient of 0.58 while for 300°K N_ on a 33°K surface a coefficient of 0.65 ...