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EXPERIMENTAL INVESTIGATIONS OF MULTILAYER INSULATION.

Author(s) : BAPAT S. L., NARAYANKHEDKAR K. G., LUKOSE T. P.

Type of article: Article

Summary

MULTILAYER INSULATION, USING ALTERNATE LAYERS OF SHIELD AND SPACER IN HIGH VACUUM, IS THE MOST EFFECTIVE CRYOGENIC INSULATION.DUE TO UNPREDICTABLE CHANGES IN PARAMETERS SUCH AS WINDING PRESSURE, UNIFORM CONTACT PRESSURE AND INTERSTITIAL PRESSURE, ACCURATE THEORETICAL PREDICTION OF MULTILAYER INSULATION PERFORMANCE IS VERY DIFFICULT. THUS, AN EXPERIMENTAL INVESTIGATION HAS BEEN CARRIED OUT CENTRED ON THE INFLUENCE OF THE NUMBER OF LAYERS AND LAYER DENSITY, WITH THE COLD BOUNDARY AT THE SAME TEMPERATURE AS LIQUID NITROGEN. THE INTERSTITIAL PRESSURE, WHICH DEPENDS ON CONDITIONS PERTAINING TO SPECIFIC PARAMETERS, SUCH AS OUTGASSING RATE OF MATERIALS, CRYOPUMPING SPEED AND TIME FOR EVACUATION, HAS ALSO BEEN MEASURED. THE RESULTS ARE COMPARED WITH THOSE OBTAINED FROM A THEORETICAL ANALYSIS CARRIED OUT FOR THE SAME COMBINATION OF SHIELD AND SPACER MATERIALS.

Details

  • Original title: EXPERIMENTAL INVESTIGATIONS OF MULTILAYER INSULATION.
  • Record ID : 1991-2379
  • Languages: English
  • Source: Cryogenics - vol. 30 - n. 8
  • Publication date: 1990

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