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Test Results of Two Small, High-Temperature Superconducting Coils

  • J. W. Lue
  • S. W. Schwenterly
  • M. S. Lubell
  • J. N. Luton
  • M. D. Manlief
  • C. H. Joshi
  • E. R. Podtburg
  • L. J. Masur
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

Electrical Measurements were performed on two high-temperature superconducting coils made by American Superconductor Corporation. One coil measured 24-mm i.d., 59-mm o.d, 50-mm long, and used 85-m long Y-124 tape conductor. The other coil measured 29-mm i.d., 44-mm o.d., 43-mm long, and used 35-m long Bi-2223 tape conductor. We obtained V-I curves from room to helium temperature by using a variable temperature cryostat cooled by helium gas in external fields up to 4 T. Without an external field, the better performing Bi-2223 coil had a critical current, I c , of 14.1 A (2,820 A/cm2 over the conductor) at 4.2 K and 1.8 A (360 A/cm2) at 77 K. At 4 T, the I c was 4.9 A (980 A/cm2) at 4.2 K and 2.0 A (400 A/cm2) at 50 K. Reduced critical current, I c (B)/I c (0) vs. field plots indicated that a single smooth curve could fit all the data up to 50 K. The reduction in critical currents with external fields for the Y-124 coil was more than 80% at i T. For the Bi-2223 coil, it was about 42% at 1 T and about 61% at 4 T.

Keywords

Critical Current Critical Current Density Solenoid Coil Final Heat Treatment Composite Wire 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • J. W. Lue
    • 1
  • S. W. Schwenterly
    • 1
  • M. S. Lubell
    • 1
  • J. N. Luton
    • 1
  • M. D. Manlief
    • 2
  • C. H. Joshi
    • 2
  • E. R. Podtburg
    • 2
  • L. J. Masur
    • 2
  1. 1.Oak Ridge National LaboratoryOak RidgeUSA
  2. 2.American Superconductor CorporationWestboroughUSA

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