Accession Number:
ADA393879
Title:
Measurement of the Lowest Pressures in Space and the Laboratory
Descriptive Note:
Technical note
Corporate Author:
GEOPHYSICS CORP OF AMERICA BEDFORD MA
Personal Author(s):
Report Date:
1965-02-01
Pagination or Media Count:
188.0
Abstract:
A description is given of the design, construction and operational characteristics of two demountable, metal ultra high vacuum systems, a mercury diffusion pump system and a combination liquid helium cryopumpion pump system. The diffusion pump system attained pressures as low as 10exp -l3 torr and was used for low pressure vacuum gauge calibration. The liquid helium cryopump system reached pressures in the low 10exp -11 torr region with only limited bake outs and exhibited a clean residual gas mass spectrum. The two systems were studied to determine their low pressure limitations and sources of residual gas.
Descriptors:
Subject Categories:
- Inorganic Chemistry
- Pumps, Filters, Pipes, Tubing, Fittings and Valves