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Measurement of AC Penetration Depth in Superconducting Wires with Fine Filaments

  • T. Matsushita
  • E. S. Otabe
  • M. Iwakuma
  • K. Funaki
  • K. Yamafuji
  • O. Miura
  • K. Matsumoto
  • Y. Tanaka
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

The critical state model of the Bean-London type predicts that the AC hysteresis loss energy density in the superconducting filaments of the diameter d f is given by W = 4μoH/3J c d f for the AC field amplitude H m smaller than the penetration field, H p = J c d f/2. However, this prediction does not agree with experimental results for multifilamentary wires with fine superconducting filaments for AC use. That is, the AC loss energy density is much smaller than the above prediction and the region of H m in which W is proportional to H m 3 extends up to much larger value than H p. This deviation was found to be caused by the reversible fluxoid motion inside the pinning potential well.1

Keywords

Critical Current Density Magnetization Hysteresis Magnetic Field Dependence Critical State Model Filament Diameter 
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

  • T. Matsushita
    • 1
  • E. S. Otabe
    • 1
  • M. Iwakuma
    • 2
  • K. Funaki
    • 2
  • K. Yamafuji
    • 2
  • O. Miura
    • 3
  • K. Matsumoto
    • 4
  • Y. Tanaka
    • 4
  1. 1.Faculty of Computer Science and Systems EngineeringKyushu Institute of TechnologyIizuka 820Japan
  2. 2.Faculty of EngineeringKyushu UniversityHigashiku, Fukuoka 812Japan
  3. 3.Superconducting Products DepartmentThe Furukawa Electric Co. Ltd.NikkoJapan
  4. 4.Yokohama R and D LaboratoriesThe Furukawa Electric Co. Ltd.Nishi-ku, Yokohama 220Japan

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