Warmly Celebrate the Successful Excitation of the All REBCO High Temperature Superconducting Magnet Participated in the Research of the Superconducting Center to 24.1T

Recently, the Hefei International Center for Applied Superconductivity has made a significant breakthrough in the development of all REBCO high-temperature superconducting magnets at the Institute of Plasma, Chinese Academy of Sciences. The Institute of Plasma, Chinese Academy of Sciences, adopts the second-generation high-temperature superconducting REBCO strip produced nationwide, and utilizes independently developed magnet technology to develop a fully REBCO high-temperature superconducting magnet that generates a central magnetic field of 24.1T under liquid helium immersion conditions. This is the first fully REBCO tightly wound superconducting magnet with a capacity of over 20T in China.

Our center and the Applied Superconducting Engineering Technology Research Laboratory of the Institute of Plasma have long been committed to the design and development of high magnetic field high-temperature superconducting magnets. We have successfully developed 19.8T and 24T hybrid magnets (low-temperature superconducting backfield magnets+REBCO high-temperature superconducting interpolation coils). The Plasma Institute team collaborated with the Department of Mechanical Engineering at Tsinghua University to establish an electromagnetic mechanical analysis model based on the shielding current induced strain effect. They proposed a joint technical solution for uninsulated and metal insulated coils, using high elastic modulus metal strip winding and metal strip outer winding processes, effectively solving the stress control problem of high-temperature superconducting magnets under low temperature and high field conditions. The team adopted innovative low resistance internal joint technology in the magnet, solving the cross turn problem of traditional double cake winding under small bending radius; Adopting an adaptive coaxial flexible support structure, the mechanical stability of nested magnets is improved. The magnet successfully rises to 300A under liquid helium immersion conditions, and the central field strength can be stably maintained at 24.1T.

It is worth noting that all the REBCO superconducting tapes used in the 24.1T superconducting magnet were provided by Shanghai Superconducting Company, demonstrating the excellent performance of domestically produced REBCO tapes under low temperature and high magnetic fields. The development of this magnet is of great significance for promoting the development of superconducting materials and superconducting magnet equipment in China, laying an important foundation for the subsequent development of high-field scientific devices above 35T.

Figure 1: All REBCO superconducting magnet with high field interpolation capability

Figure 2: Excitation curve of fully REBCO superconducting magnet

Figure 3: R&D Team