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CRITICAL CURRENT DENSITIES OF BULK, POLYCRYSTALLINE HIGH CRITICAL TEMPERATURE SUPERCONDUCTOR WIRES AND TUBES.

Author(s) : ALFORD N. M.

Type of article: Article

Summary

THE CRITICAL CURRENT DENSITY OF HIGH CRITICAL CURRENT WIRES IS SHOWN TO INCREASE AS THE DIAMETER IS REDUCED. TO DETERMINE WHETHER THIS EFFECT IS DUE TO SELF-FIELD LIMITATIONS OR SURFACE CURRENTS, EXPERIMENTS HAVE BEEN PERFORMED TO INVESTIGATE THE RELATIONSHIP BETWEEN CURRENT DENSITY, J, AND THE MAGNETIC FIELD, H. SUPERCONDUCTING YBCO TUBES HAVE BEEN FABRICATED AND THE CRITICAL CURRENT WAS MEASURED AS A FUNCTION OF THE MAGNETIC FIELD APPLIED BY PASSING A CURRENT I ALONG A COPPER WIRE LOCATED AT THE CENTRE OF THE TUBE ; CRITICAL CURRENT IS SHOWN TO REACH A MAXIMUM FOR SMALL NEGATIVE VALUES OF I. COMPARISON BETWEEN THE EXPERIMENTAL RELATIONSHIP OBTAINED BY THE AUTHORS AND THEORETICAL PREDICTIONS FROM MODELS OF J(H).

Details

  • Original title: CRITICAL CURRENT DENSITIES OF BULK, POLYCRYSTALLINE HIGH CRITICAL TEMPERATURE SUPERCONDUCTOR WIRES AND TUBES.
  • Record ID : 1991-1986
  • Languages: English
  • Source: Cryogenics - vol. 30 - n. 5
  • Publication date: 1990

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