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.

Subject Categories:

  • Inorganic Chemistry
  • Pumps, Filters, Pipes, Tubing, Fittings and Valves

Distribution Statement:

APPROVED FOR PUBLIC RELEASE