抄録
The issues of thermal stability and quench process of Low-Temperature superconductor have been studied and used appli- cation of superconducting coil. However the normal propagation property of High-Temperature superconductor, especially experiment data about thermal and electromagnetic behavior has not been reported yet. Therefore we measured the effect of operating temperature dependence of normal-zone propagation velocity, Vq, with regard to Ag sheathed Bi-2223 superconducting single core tape. We adopted operating temperature (from 10K to 40K) and transport current (load factor It/Ic: 0.4-0.9, where It is transport current and Ic is critical current) as parameters of measurements. The operating temperature is controlled by a cryocooler. As a result, we measured that normal propagation velocities of sample are slower by the two or three orders than that of Low-Temperature superconductors. Since the normal propagation velocities are 0.5-1.5[cm/s], the dependence of operating temperature is not large enough in this study.
