Apparatus to measure liquid helium boil-off from low-loss superconducting current leads

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Description

A low-loss liquid helium dewar was constructed to measure the liquid helium boil-off rate from high-temperature superconducting current leads. The dewar has a measured background heat leakage rate of 12 mW. Equations calculating the heat leakage rate from the measured vapor mass flow rate in liquid helium boil-off experiments are derived. Parameters that affect the experiments, such as density ratio, absolute pressure, and rate of pressure variation, are discussed. This study is important as superconducting current leads may be used in superconducting magnetic energy storage systems.

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23 p.

Creation Information

Cha, Y.S.; Niemann, R.C. & Hull, J.R. June 1, 1995.

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Description

A low-loss liquid helium dewar was constructed to measure the liquid helium boil-off rate from high-temperature superconducting current leads. The dewar has a measured background heat leakage rate of 12 mW. Equations calculating the heat leakage rate from the measured vapor mass flow rate in liquid helium boil-off experiments are derived. Parameters that affect the experiments, such as density ratio, absolute pressure, and rate of pressure variation, are discussed. This study is important as superconducting current leads may be used in superconducting magnetic energy storage systems.

Physical Description

23 p.

Notes

OSTI as DE97008115

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  • Other Information: PBD: Jun 1995

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  • Other: DE97008115
  • Report No.: ANL/ET/PP--87068
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/510388 | External Link
  • Office of Scientific & Technical Information Report Number: 510388
  • Archival Resource Key: ark:/67531/metadc697117

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Creation Date

  • June 1, 1995

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 12:06 p.m.

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Cha, Y.S.; Niemann, R.C. & Hull, J.R. Apparatus to measure liquid helium boil-off from low-loss superconducting current leads, report, June 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc697117/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.