CONSIDERATIONS IN THE MEASUREMENTS OF CRYOPUMPING CAPTURE COEFFICIENTS

Abstract

A survey is presented of the more important practical and theoretical relationships involved in the study of cryopumping. Starting with a rigorous definition of the capture coefficient, the effects of temperature on the measured values are derived. Several practical points in the design of a chamber for cryopumping measurements are given, including cryosurface and gage placement, calibration, effects of outgassing and impurities, and temperature measurements.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1965
Accession Number
AD0461132

Entities

People

  • J. D. Haygood
  • J. P. Dawson

Organizations

  • Arnold Engineering Development Complex

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Calibration
  • Coefficients
  • Contracts
  • Cryopumping
  • Energy
  • Energy Transfer
  • Ionization Gages
  • Mass Spectrometers
  • Measurement
  • Outgassing
  • Partial Pressure
  • Pressure Gages
  • Pressure Measurement
  • Sorption
  • Vapor Pressure

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Dynamics.
  • Systems Analysis and Design