HELIUM PUMPING BY 4.2K CRYODEPOSITS

Abstract

Studies of the trapping of helium by condensing argon on a 4.2K surface indicated that this is an effective method of removing helium from vacuum systems. Pumping speeds as high as 18.3 liters/sec-sq. cm. for 77K helium (converted to 300K helium) were obtained. Exploratory tests of nitrogen and oxygen as substrate gases for helium sorption were also carried out. During these tests the capture coefficients of argon, nitrogen, and oxygen were measured and found to be near one.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1967
Accession Number
AD0645511

Entities

People

  • J. D. Haygood
  • R. Dawbarn

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Advanced Electronics
  • Materials and Manufacturing Processes
  • Space

DTIC Thesaurus Topics

  • Adsorption
  • Air Force
  • Calibration
  • Classification
  • Coefficients
  • Contracts
  • Heat Energy
  • Heat Of Vaporization
  • Ionization Gages
  • Isotherms
  • Mass Spectrometers
  • Measurement
  • Partial Pressure
  • Sorption
  • Thermodynamics
  • Vacuum Chambers
  • Vapor Pressure

Fields of Study

  • Physics

Readers

  • Analytical Chemistry
  • Spectroscopy.
  • Thermal Physics or Thermal Science.