A device to evaluate the in-field transport properties of superconductors under strain

摘要

A tensile test device has been built to investigate the in-field transport properties of research grade Nb/sub 3/Sn internal tin superconducting wires under axial strain. The device is operated by a stepper-motor and worm gear assembly and is rated for maximum loads up to 2.5 kN. Tensile strains of 1% can be easily accommodated. The probe is instrumented with vapor-cooled current leads and high temperature superconducting current lead extensions to allow for high transport currents up to 1.5 kA. The setup was operated in the NHMFL large bore resistive magnet in fields up to 20 T. Preliminary tests on short wire samples were carried out. Results of I/sub c/(B,/spl epsiv/) measurements at 4.2 K and n-values are presented.