GM制冷机环境下高温超导体的失超行为

对高温超导体Bi2223/Ag带材在GM制冷机工作环境(30~70 K)下的失超行为进行了实验研究.建立一套GM制冷机条件下超导体失超传播特性的测试装置,使用LabVIEW语言编写了实验测试系统的控制程序,对高温超导体在不同工作条件下的失超传播速度进行测量.失超传播速度随温度的升高而加快,随电流的增加而增大.温度越高,电流越大,超导稳定性越差,失超传播越容易产生,实验结果符合理论分析.

Quenching Behavior of High-Temperature Superconductor Operating Under Conditions of GM Refrigeration

The quenching behavior of high-temperature superconductor Bi2223/Ag strip cooled at 30-70K under conditions of GM refrigeration was investigated experimentally. A testing setup for quench propagation of superconductor was thus built up with the control procedure programmed by LabVIEW language for the testing system to measure the quench propagation velocities under different operating conditions. The results showed that the quench propagation velocities increase with temperature rise and increasing current, i.e. the higher the temperature and current, the lower the superconductive stability and the easier the formation of quench propagation. Such results are in conformity to that by theoretic analysis.