高温超导体热稳定性的数值仿真及实验

超导体的最小触发能量(MQE)和最小传播电流(I_(min))是描述超导体稳定性和自我保护能力的两个重要参数.应用有限元方法(FEM)对高温超导体Bi2223/Ag带材的热稳定性进行了数值仿真,并与实验进行了对比.研究表明,通过建立合适的热分析模型,用计算机能够方便地模拟出超导体在失超过程中由超导态转变到正常态的温度变化过程,进而估算出最小触发能量和最小传播电流,结果发现数值仿真与实验结果基本一致.这对高温超导体的实际应用有重要的理论意义和参考价值.

Numerical Simulation and Experiment on Thermal Stability of High-Temperature Superconductors

Minimum quench energy(MQE)and minimum propagation current(I_(min))are the two parameters crucial to not only the stability but the self-protection of superconductor.A numerical simulation was done using FEM for the thermal stability of high-temperature Bi2223/Ag superconducting tape and the results were compared with experimental results.It was found that the temperature transition process from superconducting state to normal state can be conveniently simulated on computer through developing a suitable thermal analysis model,thus estimating MQE and I_(min).The results from numerical simulation are basically in line with that from experiment,and such a fact is of theoretical significance to the practical application of high- temperature superconductors.