Factors affecting characterization of bulk high-temperature superconductors

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Three major factors affect the characterization of bulk high-temperature superconductors in terms of their levitation properties during interaction with permanent magnets. First, the appropriate parameter for the permanent magnet is internal magnetization, not the value of the magnetic field measured at the magnet`s surface. Second, although levitation force grows with superconductor thickness and surface area, for a given permanent magnet size, comparison of levitation force between samples is meaningful when minimum values are assigned to the superconductor size parameters. Finally, the effect of force creep must be considered when time-averaging the force measurements. In addition to levitational force, the coefficient ... continued below

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19 p.

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Hull, J.R. November 1, 1997.

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  • Hull, J.R. Argonne National Lab., IL (United States). Energy Technology Div.

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Description

Three major factors affect the characterization of bulk high-temperature superconductors in terms of their levitation properties during interaction with permanent magnets. First, the appropriate parameter for the permanent magnet is internal magnetization, not the value of the magnetic field measured at the magnet`s surface. Second, although levitation force grows with superconductor thickness and surface area, for a given permanent magnet size, comparison of levitation force between samples is meaningful when minimum values are assigned to the superconductor size parameters. Finally, the effect of force creep must be considered when time-averaging the force measurements. In addition to levitational force, the coefficient of friction of a levitated rotating permanent magnet may be used to characterize the superconductor.

Physical Description

19 p.

Notes

OSTI as DE98050524

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  • 10. international symposium on superconductivity, Gifu (Japan), 27-30 Oct 1997

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  • Other: DE98050524
  • Report No.: ANL/ET/CP--94021
  • Report No.: CONF-971021--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 554771
  • Archival Resource Key: ark:/67531/metadc695409

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  • November 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, noon

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Hull, J.R. Factors affecting characterization of bulk high-temperature superconductors, article, November 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc695409/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.