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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LaChance, George M. (Monterey, California: U.S. Naval Postgraduate School, 1964);Cryogenic pumping is a means of maintaining a high vacuum with large gas in-leakage rates. This is accomplished by the condensation and freezing of the gas molecules onto a surface that is maintained at a temperature ...