AC Loss and Screening Current Calculation of HTS Magnet Stacked by Annular Plates With Different Temperatures

It is known that high-temperature superconducting (HTS) magnets can operate in higher temperature margin compared with conventional low-temperature superconductors, and the characteristics of AC loss and screening current are very important for the optimal design of HTS magnets. In this article, two methods for evaluating the critical current of HTS magnet at different temperatures are compared. The effects of operating temperature and applied external magnetic field on the AC loss and screening current of the HTS magnet stacked by annular plates are discussed and analyzed. The results show that when the amplitude of the ac magnetic field is lower than that of the fully penetrating magnetic field, the magnetization loss decreases with the decrease of the operating temperature. The hysteresis loop area of the HTS magnet stacked by Rare-Earth-BaCu oxides annular plates increases at higher temperature under the same magnetic field.