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To generate a magnetic field exceeding 20 T, high-temperature superconductors (HTS) are essential. This study focuses on the conduction cooling experiments of high-temperature superconducting magnets capable of generating a 20 T magnetic field. This magnet is designed to operate at temperatures up to 20 K using hybrid HTS tapes, and the room temperature bore is 50 mm. To solve mechanical and electrical problems, a stainless steel co-winding method was applied, and the double pancake coils (DPC) were connected using a solderless joint method to effectively eliminate corrosion issues due to flux.
Out of the total 18 DPCs required for the 20 T, 8 DPCs have been manufactured and cooling experiments have been performed on them. Cooling was achieved using Sumitomo's RDK-415D GM cooler, with the coil cooling temperature reaching approximately 5 K and a magnetic field of 5.4 T. The remaining 10 DPCs will be manufactured and assembled to complete the 20 T magnet, with the Cryomech’s PT-815 cooler to be used for conduction cooling.
Acknowledgement: This research was supported by National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (2022M3I9A1072464).
