CRYOPUMP

Domain	Definition
Aerospace	1. An exposed surface refrigerated to cryogenic temperature for the purpose of pumping gases in a vacuum chamber by condensing the gas and maintaining the condensate at a temperature such that the equilibrium vapor pressure is equal to or less than the desired ultimate pressure in the chamber. 2. The act of removing gases from an enclosure by condensing the gases on surfaces at cryogenic temperature.Also referred to as a cryogenic pump and not to be confused with cryogenic fluid pump for circulating cryogenic propellants. (references)
Source: compiled by the editor from various references; see credits.

Specialty Definition: Cryopump

A vacuum cryopump typically consists of a vacuum-tight vessel with a valved inlet, containing a highly absorbent material such as a synthetic zeolite microporous on the scale of 1 to 10 Å (Angstrom units), and an enclosing cryogenic vessel. In industrial cryopumps, the vessel will typically be a Dewar flask, but homespun sorption pumps may be as simple as a labglass flask of zeolite in a styrofoam cooler filled with liquid nitrogen.

Sorption pumps are often used as roughing pumps to reduce pressures from the range of atmospheric to on the order of 10^-3 torr, while lower pressures are achieved using a finishing pump (q.v. vacuum). As the sorbent saturates, the effectiveness of a sorption pump decreases, but can be recharged by heating the zeolite material (preferrably under conditions of low pressure) to a temperature near but below the breakdown point of the zeolite material's porous structure.

Frequency of Internet Keywords: CRYOPUMP

Anagrams: CRYOPUMP

Scrabble® Enable2K-Verified Anagrams
	Words within the letters "c-m-o-p-p-r-u-y"
	-2 letters: croupy.
	-3 letters: coypu, croup, crump, cuppy, mucor, mucro, roupy.
	-4 letters: comp, copy, corm, cory, coup, crop, mopy, pomp, pour, prom, prop, pump, romp, ropy, roup, rump, your.
	-5 letters: cop, cor, coy, cry, cum, cup, cur, moc, mop, mor, orc, our, pom, pop, pro, pry, pup, pur, roc, rom, rum, ump, upo, yom, you, yum.
Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro.