多脉冲磁场下含热开关高温超导环的励磁研究

Study on excitation of HTS ring with thermal switch in multi-pulsed magnetic field

针对堆叠式高温超导磁体的持续电流模式运行,提出一种由多脉冲磁场和热开关组合的励磁方法。在77 K温度下对高温超导环进行了系统的励磁实验研究,并采用有限元方法建立模型对高温超导环中的电流及产生的磁场进行了仿真。励磁结束后高温超导环产生的磁场稳定,磁场大小与多脉冲磁场幅值呈正相关。结果表明,该励磁方法可行,有望应用于堆叠式高温超导磁体的持续电流模式运行。

Aiming at the operation of stacked HTS magnets in persistent current mode, an excitation method combining multi-pulsed magnetic field and thermal switch was proposed. Systematic excitation experiment study was carried out on the HTS ring at 77 K,and the finite element method was used to establish model to simulate the current in the HTS ring and the magnetic field generated by it.The magnetic field generated by the HTS ring was stable after the excitation, and the magnitude of the magnetic field was positively correlated with the amplitude of the multi-pulsed magnetic field.Results show that the excitation method is feasible, and the method is expected to be applied to the operation of stacked HTS magnets in persistent current mode.