CRYOPUMPING OF 77 K NITROGEN AND ARGON ON 10-25 DEGREES K SURFACES

Abstract

Results are presented on the first phase of an experimental program designed to study the effects of gas and cryosurface temperatures on the capture coefficient in cryopumping. Experimental pumping speeds and capture coefficients were obtained for 77 K nitrogen and argon on a spherical cryosurface with tem peratures ranging from 10 to 25 K. The capture coefficients for the two gases were found to follow exponential functions of the cryosurface temperature. These functions were found to be similar to the Boltzmann distribution law.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1963
Accession Number
AD0404174

Entities

People

  • J. A. Collins
  • J. P. Dawson

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Analyzers
  • Calibration
  • Coefficients
  • Cryopumping
  • Equations
  • Experimental Data
  • Government Procurement
  • Governments
  • Heat Of Sublimation
  • Measurement
  • Nitrogen
  • Partial Pressure
  • Pumping
  • Residuals
  • Vacuum Chambers
  • Vapor Pressure

Readers

  • Approximation Theory.
  • Nanoscale Plasmonic Nanotechnology
  • Plasma Physics.