THE THEORY AND CONSTRUCTION OF A LIQUID HELIUM CRYOGENIC PUMP
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Authors
LaChance, George M.
Subjects
Advisors
Pucci, Paul F.
Date of Issue
1964
Date
1964
Publisher
Monterey, California: U.S. Naval Postgraduate School
Language
en_US
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.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.