THE THEORY AND CONSTRUCTION OF A LIQUID HELIUM CRYOGENIC PUMP.

reportActive / Technical Report | Accession Number: AD0481222 | Need Help?

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

Author(s):
Lachance, George M.
Author Organization(s):
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Descriptive Note:
Master's thesis,
Annotation:
The theory and construction of a liquid helium cyrogenic pump. (Thesis)
Pagination:
0046

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*CRYOPUMPING, THEORY), LIQUEFIED GASES, HELIUM, PUMPS, DESIGN, CONSTRUCTION, ASSEMBLY, PERFORMANCE(ENGINEERING), INSTRUMENTATION, HEAT SHIELDS, VACUUM APPARATUS
Field(s)/Group(s):
Solid State Physics
Report Date:
1964 Jan 01