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General working formulae usable for calculations of ac losses in superconducting multi-stage twisted cables have been developed. In situ contact resistances between subcables of different cabling level, as well as ac losses, have been measured on full size steel jacketed 40 kA NbTi and Nb(3)Sn conductors developed for NET/ITER applications. In addition to the strand resistive barriers (CuNi inside NbTi strands and chrome plating for Nb(3)Sn strands) stainless steel spacers have been used inside these cables to reduce the ac losses. Theory and measurements emphasise the role played by the steel spacers in the reduction of the total ac losses of this kind of conductor. The paper also gives conditions for a good compromise between low ac losses (large transverse resistance) and sufficient current transfer (low transverse resistance) that ensures a correct current distribution among strands.

Additional information

Authors: CIAZYNSKI D, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);TURCK B, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);DUCHATEAU J L, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);MEURIS C, CEA, CEN Saclay, Gif-sur-Yvette (FR)
Bibliographic Reference: Paper presented: 1992 Applied Superconductivity Conference, Chicago (US), August 23-28, 1992
Availability: Available from (1) as Paper EN 37078 ORA
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