Electromagnetic characteristics analysis of High Temperature Superconductor stack with magnetic substrate

Ac loss plays an import role in the design of High Temperature Superconductor (HTS) device such as HTS Superconducting magnetic energy storage (SMES) and Motors. And in the above-mentioned applications, the HTS tape always appears in the formation of stacked conductors to increase the current carrying capability. Therefore, in reality it is necessary to learn the loss characteristics of the HTS stacked conductors. In this work, we studied the AC loss characteristics of the HTS stack with magnetic substrate by a 2D-finite element simulation model which was built based on the H-formulation in COMSOL. The model was verified by the measured result at first. And then, the magnetic field distribution, current distribution and loss distribution are given to study the electromagnetic characteristics of the stack. Finally, the frequency dependence characteristics of the HTS stack are analyzed by the measured and simulated results.