Abstract
The measurement of critical current of superconducting conductors under applied tensile strain in high magnetic field [IC(B, isin) is essential for the application of Nb3Sn composite conductor in high field superconducting magnets. The large bore 20 T DC magnet at the NHMFL along with a device designed to apply tensile strain allows the IC(B, isin) measurement of about 100 mm long straight Nb3Sn composite wire. The superconducting wires are soldered to dog-bone shaped backing plates made of different materials. Our results show that the backing plate materials have significant effects on the measured IC(B, isin) behaviors. This paper also reports our recent experimental results on high current density Nb3Sn conductors.
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