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We have been conducting the basic design, fabrication, and testing of a joint-less high-temperature superconducting (HTS) magnet operating in persistent current mode using second-generation HTS conductors. The joint-less winding method is typically used to produce double pancake coils, but for magnet applications, multiple coils must be stacked. However, the inherent characteristics of the joint-less winding method result in gaps between pancake coils, which degrade both the central magnetic field strength and the spatial homogeneity of the magnetic field. To address this issue, we proposed a coaxially arranged joint-less HTS magnet by symmetrically combining two joint-less coils in an up-down configuration. Unfortunately, small manufacturing errors led to significant induced current differences, resulting in poor magnetic field distribution. In this paper, we propose a concentrically arranged HTS joint-less magnet, consisting of an inner coil with a smaller inner diameter placed inside an outer coil with a larger inner diameter. Based on the fabrication and testing of a prototype, we evaluated the design and verified the potential of the concentrically arranged HTS joint-less magnet for applications in nuclear magnetic resonance (NMR) systems.
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.
