Study of Quench and Its Characterization on High Temperature Superconducting Bi-2223/Ag Tape

Nowadays, high temperature superconductor magnet applications have become a reality due to increases in conductor performance. Detailed knowledge of the superconducting to resistivity transition (quench) process is essential and usually this transition is described by power law. In this paper, the quench and the process of quench propagation are studied in a short sample of Bi-2223/Ag superconducting tape by applying localized heat pulses and using 1D simulation with the Comsol multiphysics 4.4 program. The minimum quench energy (MQE) and quench propagation velocity (vMPZ) are two important parameters for the stability and protection of a superconducting magnet. Hear, by increasing the current and temperature, the MQE decreasing rate is investigated as a superconducting stability factor. Moreover, the changing rate of the normal zone propagation velocity is studied as a self-protection parameter against the quenching.