Speaker
Description
We have been developing the SCSC cable (Spiral Copper-Plated Striated Coated-Conductor Cable) consisting of copper-plated striated (multifilament) coated conductors wound spirally around a round core. Its spiral geometry decouples filaments electromagnetically against transverse magnetic fields like twisted low Tc superconductor wire and, then, reduces AC loss. The copper helps current sharing between filaments, making the cable more robust against local defects and normal transitions. Winding multiple copper-plated striated coated conductors allows the cables to carry a large current. One of the advantages of this cable is its ability to bend it in all directions, which enables winding three-dimensional-shape coils. During winding processes, bending stress, axial tensile stress and transverse compressive stress are applied to the cables. Consequently, each tape in the cable experiences combined stress of axial tensile, transverse compression, torsion and shear stress from the load of flatwise/edgewise bending and torsion. Firstly, we examine the influence of such various mechanical stresses on the current transport characteristics of short sample of SCSC cable. Bending stress, axial tensile stress and transverse compressive stress, which simulate those in winding processes, are applied to short samples of SCSC cables at room temperature. Hereafter, their voltage – current characteristics are examined in liquid nitrogen. Secondly, a small coil is wound under practical winding conditions. Its voltage – current characteristic is examined in liquid nitrogen, and the results are compared with the results obtained using short samples.
This work was supported by JST-ALCA-Next Program Grant Number JPMJAN24G1, Japan.
