Experimental Study of AC Losses in a Rutherford Type Cable

  • S. Jeong
  • C. Y. Gung
  • J. V. Minervini
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)


This paper describes measured AC losses of NbTi Rutherford type cable when the wide side of the cable is parallel to the field variation. In the case of a Rutherford type cable, the orientation of the cable in the magnetic field is an important factor for the interstrand coupling loss which can be dominant over other AC losses such as hysteresis loss or intrastrand coupling loss. A calorimetric method was used to quantify experimentally the AC losses of the cable. The measurement results were essential to the thermal design of a superconducting pulse coil set for use in stability experiments on the TPX (Tokamak Physics Experiment) subsize conductors. AC losses were also measured with transport current to see its effect on this loss. The transport current effect on the interstrand coupling loss was generally negligible when the 0.086 T ripple field at 7.5 Hz was applied to the cable on top of the dc bias field. However, when the field was varied in the slow continuous triangular wave between 0 to 7 T, the AC loss increased noticeably due to transport current.


Lorentz Force Ramp Rate Transport Current Hysteresis Loss Coupling Loss 
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.
    V. E. Sytnikov, G. G. Svalov, S. G. Akopov, and I. B. Peshkov, Coupling losses in superconducting transposed conductors located in changing magnetic fields, Cryogenics 29:926 (1989).CrossRefGoogle Scholar
  2. 2.
    G. T. Mallick, Jr., D. Natelson, W. J. Carr, Jr., G. Snitchler, and V. Kovachev, Results of AC loss measurements on heat treated SSC cables, IEEE Trans. Appl. Superconductivity 3:744 (1993).CrossRefGoogle Scholar
  3. 3.
    A. P. Verweij, A. den Ouden, B. Sachse, H. H. J. ten Kate, The effect of transverse pressure on the interstrand coupling loss of Rutherford type of cables, Adv. Cryo. Eng. 40:521 (1993).Google Scholar
  4. 4.
    Y. Z. Lei, T. Shintomi, A. Terashima, and H. Hirabayashi, AC loss measurements of Rutherford type superconducting cables under mechanical stresses, IEEE Trans. Appl. Superconductivity 3:141 (1993).Google Scholar
  5. 5.
    A. P. Verweij and H. H. J. ten Kate, Coupling currents in Rutherford cables under time varying conditions, IEEE Trans. Appl. Superconductivity 3:146 (1993).CrossRefGoogle Scholar
  6. 6.
    M. Wake, D. Gross, R. Yamada, and D. Blatchley, AC loss in energy doubler magnets, IEEE Trans. Magn. 15:141 (1979).CrossRefGoogle Scholar
  7. 7.
    M. Polak, L. Krempasky, I. Hlasnik, and J. Perot, Losses in 23 strands NbTi and Nb3Sn flat cables, IEEE Trans. Magn. 17:2035(1981).CrossRefGoogle Scholar
  8. 8.
    C. Y. Gung, Energy dissipation of composite multifilamentary superconductors for high-current ramp-field magnet applications, Ph. D. Thesis, Massachusetts Institute of Technology, Cambridge, MA (1993).Google Scholar
  9. 9.
    H. H. J. ten Kate, AC losses and magnet research, Adv. Cryo. Eng. 40:559 (1993).Google Scholar
  10. 10.
    C. Y. Gung, M. Takayasu, J. V. Minervini, M. A. Ferri, and M. M. Steeves, Comparison of AC losses of superconducting wires for ramped-field applications, IEEE Trans. Appl. Superconductivity, 3:452 (1993).CrossRefGoogle Scholar
  11. 11.
    M. N. Wilson, Superconducting magnets, Oxford: Clarendon, 1983, pp. 159–199.Google Scholar
  12. 12.
    A. Akhmetov, A. Devred, R. Schermer, and R. Mints, Current loop decay in Rutherford-type cables, Fifth Annual International Symposium on the Super Collider (1993).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • S. Jeong
    • 1
  • C. Y. Gung
    • 1
  • J. V. Minervini
    • 1
  1. 1.Plasma Fusion CenterMassachusetts Institute of TechnologyCambridgeUSA

Personalised recommendations