Study on Current Distribution of HTS Gourd-Loop Energized by Field Cooling

High-temperature superconducting (HTS) magnets with persistent current mode (PCM) are a promising technology with potential for generating strong magnetic fields, but the technical bottleneck of the PCM is the inability to make superconducting joints without resistance between HTS tapes. A HTS gourd-loop made from REBCO tape has recently been proposed to manufacture HTS magnets that does not require the joining of the HTS tapes. In this paper, we adopt an iron core wound by copper wire to excite the HTS loop by the field cooling (FC) method and experiment with a liquid nitrogen bath. Fields distribution on the surface of the HTS loop was measured by a Hall microscopy equipment (MCorder 2D), and the effect of the presence and absence of an excitation coil on the magnetic field captured by the HTS loop was compared after excitation. The current density on the surface of the HTS loop was meticulously calculated to assess performance characteristics, followed by a theoretical analysis of the results. These findings indicate significant potential for the application of HTS closed-loop magnets with PCM.