Filament Area Variations and Critical Current in Nb-Ti Superconducting Composites

  • Girish Narang
  • William H. Warnes
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)


Image analysis techniques have been used to see the variation in the filament area along the edge of a Nb-Ti/Cu multifilamentary superconductor. This is important because the edge filaments were found to have a greater variation in their area as compared to the filaments on the inner layers and could have a considerable effect on the critical current properties of multifilamentary superconductors.

Also, the second derivative of the V(I) transition in a monofilament composite has been studied to get a better understanding of the dependence of critical current distributions on the variation in the critical current along the length of the wire. This can prove to be an effective tool for measuring conductor quality more precisely.


Image Analysis Technique Inside Edge Wire Sample Derivative Versus Filament Area 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    W.H. Warnes. “The Resistive Critical Current Transition in Composite Superconductors”, PhD thesis, University of Wisconsin, Madison (1986).Google Scholar
  2. 2.
    W.H. Warnes, D.C. Larbalestier, Critical current distributions in superconducting composites, Cryogenics, vol. 26 (12), pp 643 (1986).CrossRefGoogle Scholar
  3. 3.
    W.H. Warnes. A model for the resistive critical current transition in composite superconductors, Journal of Applied Physics, vol. 63 (5), pp 1651 (1988).CrossRefGoogle Scholar
  4. 4.
    Y.E. High, P J Lee, J.C. McKinnel, D.C. Larbalestier, Quantitative analysis of sausaging in Nb Hamer clad filaments of Nb-46.5wt% Ti as a function of filament diameter and heat treatment. Advances in Cryogenic Engineering (Materials), vol 38 (1992).Google Scholar
  5. 5.
    G. Narang, W.H. Warnes, Extended measurements of the resistive critical current transition, IEEE Trans. on Appl. Supercond., vol 3, no. 1, (March1993).Google Scholar
  6. 6.
    Z. Guo, W.H. Warnes, Mechanics of Nb-Ti superconducting composites. Paper # CS-11, to be presented at CEC/ICMC 93, Albuquerque, New Mexico.Google Scholar
  7. 7.
    L.D. Cooley, P.D. Jablonski, P.J. Lee and D.C. Larbalestier, Strongly enhanced critical current density in Nb 47wt%Ti having a highly aligned microstructure. Appl. Phys. Lett 58 (25) 24 June (1991).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Girish Narang
    • 1
  • William H. Warnes
    • 1
    • 2
  1. 1.Department of Mechanical EngineeringOregon State UniversityCorvallisUSA
  2. 2.Center for Advanced Materials ResearchOregon State UniversityCorvallisUSA

Personalised recommendations