Electrical Resistance of Superconducting Cable Splices

  • M. Kuchnir
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 44)


The electrical resistance of superconducting cable splices is known to be in the 10-9 Ω range which to be measured conventionally would require the use of a micro voltmeter with a power supply capable of generating kilo Amperes plus a liquid helium cryostat with large power leads. Here we present a system for carrying on such measurements that requires besides the microvoltmeter a power supply capable of generating only up to 35 A and a 152 mm diameter neck helium dewar using less than 25 liters per day after initial cool down. In this paper we describe the apparatus and present the data taken with it in its first use which for data acquisition used just a chart recorder. The method is based in making the splice in a loop of cable, inducing a current in it and measuring its decay time constant. Generating high currents in superconductors by induction is not a new technique but the use of the decay constant of currents generated this way for the determination of minute electrical resistance seems novel to the author. Unexpected details in the results will be discussed.


Large Hadron Collider Decay Constant Decay Time Constant Primary Coil Coil Form 
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  1. 1.
    A. Zlobin “private communication”Google Scholar
  2. 2.
    N.V. Gillani and R.B. Britton, Critical currents of superconductors in low fields, Rev. Sci. Instrum. 40, 949–951 (1969).ADSCrossRefGoogle Scholar
  3. 3.
    J.R. Purcell, H. Desportes, Short sample testing of very high current superconductors, Rev. Sci. Instrum. 44, 295–296 (1973).ADSCrossRefGoogle Scholar
  4. 4.
    E.M.W. Leung, H.G. Arrendale, R.E. Bailey and P.H. Michels, Short sample critical current measurements using a superconducting transformer, “Advances in Cryogenic Engineering” 33, 2I9226,(1988)Google Scholar
  5. 5.
    G.B.J. Mulder, H.H.J. ten Kate, H.J.G. Krooshoop and L.J.M. van de Klundert, On the inductive method for maximum current testing of superconductive cables, “Proceedings of the 11th Int. Conf. on Magnet Technology, MT-11, Japan” 1, 479–484, (1989)Google Scholar
  6. 6.
    K. Ohira, Y. Asano, T. Shioiri, A. Ishiyama, and K. Hosoyama, Study on the reduction of current for a high field superconducting magnet by using a superconducting transformer, Cryogenics 36, 167–170, (1996).CrossRefGoogle Scholar
  7. 7.
    Spool #B-35 with 1820 ft of SSC (B and W Correction Coil Phase II Contract No. 304505 CM-13 Reference DEAC35–89ER-40486) multifilamentary NbTi wire with 0.0148 in bare diameter.Google Scholar
  8. 8.
    Strain gauge Model SR-4, Type FAED-25–12S13L manufactured by BLH Electronics, Inc, Waltham, MA 02154Google Scholar
  9. 9.
    DANA digital voltmeter Model 5900Google Scholar
  10. 10.
    Houston Instruments chart recorder Model OmniScribe D5000 SeriesGoogle Scholar
  11. 11.
    J.C. Tompkins “private communication”Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • M. Kuchnir
    • 1
  1. 1.Fermi National Accelerator LaboratoryBataviaUSA

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