Development of Ag-sheathed Bi2223 superconducting wires

SEI has established the whole scheme on the I-V evaluation and the total length assurance for Ag-sheathed Bi2223 superconducting wires to keep up with advanced application studies. They consists of the temperature and magnetic field variable critical current measurement system, the sequential critical current measurement system with an automatic defect-catch function and the full length I-V measurement at 77.3 K in liquid nitrogen using a noninductive coil method. The integrated intelligence from these three systems assures the wide range I-V performance under any required conditions of temperature and magnetic field, which is a first priority for all of the superconducting applications.