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Improvement of superconducting properties of Bi-2212 round wire and primary test results of large capacity Rutherford cable

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11 Author(s)
Hasegawa, T. ; Showa Electr. Wire & Cable Co. Ltd., Kanagawa, Japan ; Ohtani, N. ; Koizumi, T. ; Aoki, Y.
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We have developed HTS cables using Bi-2212 round wires, which have high mechanical strength and an average Jc of 200 kA/cm2 at 4.2 K in self-field. Four designs of cables were fabricated in this work and those tables could carry Ic values from 1 kA to 10 kA at 4.2 K and self-field depending on the number of strands. A 70m-long 20-strand Rutherford cable was successfully manufactured. Optimization of heat treatment conditions was effective to reduce Ic degradation observed in the case of heat treatment with a long length. Ic values of a Rutherford cable were measured under loading at 4.2 K in 4 T. The critical values of the stress on face loading and edge loading were 60 MPa and 100 MPa, respectively. We successfully obtained high Jc value of 500 kA/cm2, which was almost double that of the conventional wires capitalize “Rutherford”

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )