Accession Number : AD0481222
Title : THE THEORY AND CONSTRUCTION OF A LIQUID HELIUM CRYOGENIC PUMP.
Descriptive Note : Master's thesis,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : LaChance, George M.
Report Date : 1964
Pagination or Media Count : 46
Abstract : 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 well below the freezing point of the gas. A liquid helium filled batch process cryogenic pumping system was constructed and instrumented. The vacuum chamber and roughing system were obtained by the modification and redesign of an existing vacuum furnace. The theory of cryogenic pumping is presented and an approach developed for the evaluation of the cryopump performance. (Author)
Descriptors : (*CRYOPUMPING, THEORY), LIQUEFIED GASES, HELIUM, PUMPS, DESIGN, CONSTRUCTION, ASSEMBLY, PERFORMANCE(ENGINEERING), INSTRUMENTATION, HEAT SHIELDS, VACUUM APPARATUS.
Subject Categories : Solid State Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE