Performance of Superconducting NbTi and NbZr Inorganic Solenoids

  • R. E. Hintz
Conference paper
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 13)


Recent developments in coil construction and NbTi superconductors have resulted in magnets described by the following distinctive characteristics:
  1. 1.

    Reliable. Coils have consistently operated at the high short-sample limit of the conductor. The coils are self-protecting and may be safely transitioned while partially submersed in liquid helium.

  2. 2.

    Compact. Average current densities of 20,000 to 55,000 A/cm2 have been produced with fields, from 40 to 70 kG and bores up to 5 in.

  3. 3.

    Economical. Below 80 kG, NbTi superconductors operating near the short-sample limit offer significant savings when compared with presently available NbZr and Nb3Sn conductors.

  4. 4.

    Electrically insulated. Coils can be charged to full current within 1 min without training effects. There are no shunt currents and the field corresponds directly with the charge current.

  5. 5.

    Improved performance below 2°K. Operation in helium II results in an increase in the critical current and permits high charge rates.

  6. 6.

    Strong. The ductile NbTi copper-clad conductor will withstand large hoop stresses. Fiberglass cloth maintains electrical insulation between layers under high compressive loads.

  7. 7.

    Moderate currents. Reduces expense of the power supply and lead losses. The cost of the present conductors compares favorably with large conductors.



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  1. 1.
    R. E. Hintz and C. Laverick, “An Inorganically Insulated Superconducting Solenoid for Operation at 1°K,” paper presented at Stanford International Symposium on Magnet Technology, Stanford, California (1965).Google Scholar
  2. 2.
    Z. J. J. Stekly, in: International Advances in Cryogenic Engineering, Plenum Press, New York (1962), p. 585.Google Scholar
  3. 3.
    R. E. Hintz, “Inorganic Insulated NbZr and NbTi Solenoids,” paper presented at National Superconductivity Information Meeting, Brookhaven National Laboratory, New York (Nov. 1966).Google Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • R. E. Hintz
    • 1
  1. 1.Lawrence Radiation LaboratoryUniversity of CaliforniaBerkeleyUSA

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