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Description
REBCO high-temperature superconductor are widely used in high magnetic field applications, due to their excellent critical current properties and high critical temperature. However, the width-to-thickness ratio of REBCO tapes is very large (typically in the range of 1000-10000) resulting in excessive power dissipation in the applications. One of the effective ways to reduce AC loss is to divide the superconducting layer in the REBCO tape into filaments. The degradation of the current-carrying performance of the prepared multi-filamentary tape is concerned. In this study, the copper-stabilizing layers and superconducting layers were cut by the independently developed through a self-developed reel-to-reel ultraviolet picosecond laser cutting device to prepare REBCO multi-filamentary tapes with different numbers of filaments (2-filament, 6-filament, and 10-filament). The research results show that the depth of the cut groove is about 30 μm and the width of the groove on the superconducting layer is about 15 μm. The study systematically characterized the cut multi-core materials and found that ultraviolet picosecond laser cutting did not lead to significant degradation of Ic performance. It is found that the cutting multi-core material can make a significant reduction in AC loss. After low temperature testing, it was found that the high-field inserted superconducting coil had good high-field current carrying characteristics and low-temperature characteristics after copper plating. This study solves the preparation process problem of ReBCO high-temperature superconducting multi-core materials and studied the materials' low-temperature and high-field performance characterization. The research results show that the preparation process of multi-core belts has practical potential.
