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A non-contact method for estimating critical current is proposed, which can be applied to both single superconducting wires and various types of cables with multiple superconducting wires. The authors have previously proposed a method for measuring magnetization loss of a superconducting wire as a means of non-contact estimation of the critical current of a single superconducting wire. Since the magnetization loss generated in a superconductor by an external magnetic field is closely related to the full penetration depth of the externally applied magnetic field and the critical current density of the superconductor, the critical current of the superconductor could be successfully estimated by measuring the change of magnetization loss with the external magnetic field. The method is completely non-contact, using only an external magnetic field and a pick-up coil to estimate the critical current, eliminating the possibility of physical damage to the superconducting sample during the measurement process. The authors propose that for superconducting stacked cables with multiple layers, the magnetic shielding effect of each layer is superposed, requiring additional calibration calculations. To validate this proposal, a test was conducted to estimate the critical current of a high-temperature superconducting stacked wire. The magnetization loss was measured by varying the number of wire layers to one, two, and four. The actual critical current magnitude was then compared to the estimated critical current of the high-temperature superconducting stack by varying the number of layers of superconducting wires from one to four.
This research was supported by National R&D Program (2022M3I9A1076800) and Basic Science Research Program (2021R1F1A1063208 and 2023R1A2C1005911) through the National Research Foundation of Korea(NRF) funded by Ministry of Science and ICT.
