Fusion magnets generate significant AC loss during the processes of excitation and demagnetization. The electrical measurement was predominantly employed as the method for estimating the AC loss. However, the phase-locked amplifier method and integral method (IM) can access the average power across one or multiple current cycles but leave the instantaneous power value unrecorded. In this study, the AC loss of two types of high-temperature superconducting (HTS) stacked conductors composed of REBCO and Bi-2223 were measured. An AC loss analysis method based on parameter identification method is employed to study AC loss in REBCO and Bi-2223 stacked conductors by identifying their instantaneous inductance and instantaneous resistance. Unlike the integral method, the AC loss analysis method based on parameter identification method can analyze the average power, and also the instantaneous power at any given time using a fixed forgetting factor which can affect the accuracy of the calculation. The experimental data suggest that, under identical frequency and current, the AC loss of the REBCO stacked conductor is approximately three times that of the Bi-2223 stacked conductor.

中文翻译：

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基于参数辨识法的高温超导叠层导体交流损耗研究

聚变磁体在励磁和退磁过程中会产生显着的交流损耗。主要采用电气测量作为估计交流损耗的方法。然而，锁相放大器法和积分法（IM）可以获取一个或多个电流周期的平均功率，但不记录瞬时功率值。在这项研究中，测量了由 REBCO 和 Bi-2223 组成的两种高温超导 (HTS) 堆叠导体的交流损耗。采用基于参数识别法的交流损耗分析方法，通过识别REBCO和Bi-2223堆叠导体的瞬时电感和瞬时电阻来研究它们的交流损耗。与积分法不同，基于参数辨识法的交流损耗分析方法可以分析平均功率，也可以使用固定的遗忘因子来分析任意给定时间的瞬时功率，该遗忘因子会影响计算的准确性。实验数据表明，在相同频率和电流下，REBCO叠层导体的交流损耗约为Bi-2223叠层导体的三倍。