T. Hasegawa et al., Improvement of superconducting properties of Bi-2212 round wire and primary test results of large capacity Rutherford cable, IEEE APPL S, 11(1), 2001, pp. 3034-3037
We have developed HTS cables using Bi-2212 round wires, which have high mec
hanical strength and an average J(c) of 200kA/cm(2) at 4.2K in self-field.
Four designs of cables were fabricated in this work and those cables could
carry I-c values from 1kA to 10kA at 4.2K and self-field depending on the n
umber of strands. A 70m-long 20-strand Rutherford cable was successfully ma
nufactured. Optimization of heat treatment conditions was effective to redu
ce I-c degradation observed in the case of heat treatment with a long lengt
h. I-c vales of a Rutherford table were measured under loading at 4.2K in 4
T, The critical values of the stress on face loading and edge loading were
60MPa and 100MPa, respectively. We successfully obtained high J(c) value of
500kA/cm(2), which was almost double that of the conventional wires capita
lize "Rutherford".