Measurement of the Lowest Pressures in Space and the Laboratory

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 10(exp -l3) torr and was used for low pressure vacuum gauge calibration. The liquid helium cryopump system reached pressures in the low 10(exp -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.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1965
Accession Number
ADA393879

Entities

People

  • Wallace Kreisman

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Carbon Monoxide
  • Chambers
  • Chemical Reactions
  • Construction
  • Dielectric Gases
  • Diffusion Pumps
  • Elements
  • High Pressure
  • High Vacuum
  • Ion Pumps
  • Ionization
  • Mass Spectra
  • Mass Spectrometers
  • Measurement
  • Measuring Instruments
  • Pressure Measurement
  • Pumping

Fields of Study

  • Physics

Readers

  • Aerospace Test and Evaluation
  • Combustion and Flow Dynamics.
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster