AC Loss Measurements on Multifilamentary BSCCO 2223 High-Temperature Superconductors

  • D. Aized
  • E. C. Jones
  • G. Snitchler
  • J. Campbell
  • A. P. Malozemoff
  • R. E. Schwall
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

A calorimetric method for measuring AC loss in long lengths of high temperature superconductor (HTS) at 77 K has been developed. Complementary systems with resolution down to 1 mW/cc have been installed at Oak Ridge National Laboratory (ORNL) and American Superconductor Corporation (ASC) and give consistent results, confirming the reliability of the technique. AC excitation fields up to 0.25 T and at 5 to 60 Hz are supplied by a multifilament BSCCO solenoid which has been in operation for over a year; this is the world’s first HTS magnet system that performs a useful technical function in a cost-competitive manner. Results are presented on 85 filament BSCCO composite conductors showing dependence suggesting hysteretic losses.

Keywords

Nylon Calorimetry Grease Verse Metra 

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References

  1. 1.
    C.J. Christopherson and G.N. Riley Jr., “Development of Twisted High-Temperature Superconductor Composite Conductors,” Appl. Phys. Let., 66: 2277–79 (1995).CrossRefGoogle Scholar
  2. 2.
    CJ. Christopherson and G.N. Riley Jr., “The Development of Twisted High-Temperature Superconducting Composites,” Submitted to the ICMC/CEM Conference held in Columbus, OH on July 17–22, 1995.Google Scholar
  3. 3.
    S. Fleshier, L. Cronis, G. Conway, A.P. Malozemoff, J. McDonald, T. Pe, J.R. Clem, G. Vellego, and P. Metra, “Measurement of the true ac power loss of Bi-2223 composite tapes using the transport technique,” submitted J. Appl. Phys. (1995).Google Scholar
  4. 4.
    W. Carter, G.N. Riley Jr., A. Otto, D.R. Parker, C.J. Christopherson, and L.J. Masur, “ Advances in the development of silver sheathed (Bi,Pb) 2223 compoiste conductors,” IEEE Trans, on Applied Superconductivity, 5, 1145–1149(1995).CrossRefGoogle Scholar
  5. 5.
    Schmidt, C. “Calorimetric ac loss measurement in the microwatt range: a new simplified measuring technique”, Cryogenics 34, 3(1994)CrossRefGoogle Scholar
  6. 6.
    K. Kwasnitza and St. Clerc, “AC losses of superconducting high-Tc multifilamentary Bi-2223/Ag sheathed tapes in perpendicular magnetic fields,” Physica C 223: 423–435 (1994).CrossRefGoogle Scholar
  7. 7.
    M. N. Wilson, Superconducting Magnets, Oxford Press, (1983).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • D. Aized
    • 1
  • E. C. Jones
    • 2
  • G. Snitchler
    • 1
  • J. Campbell
    • 1
  • A. P. Malozemoff
    • 1
  • R. E. Schwall
    • 1
  1. 1.American Superconductor CorporationWestboroughUSA
  2. 2.Oak Ridge National LaboratoryOak RidgeUSA

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