Recently, Prof. WANG Qiuliang's group from the Institute of Electrical Engineering of the Chinese Academy of Sciences developed an all-superconducting magnet with a central magnetic field of up to 32.35 Tesla (T), which is a new record of the highest magnetic field generated by all-superconducting magnets.

The magnet was built with independently developed high-temperature interpolation magnet technology, breaking the world record of the 32.0 T superconducting magnet created by the US National High Magnetic Field Laboratory in December 2017. 

The upper limit of the magnetic field strength generated by the low-temperature superconducting magnet is about 23.0T. In order to obtain a higher magnetic field, the combination of high-temperature superconducting magnets and low-temperature superconducting magnets are employed.

The high-temperature superconducting magnet is used as an inserted magnet into the bore of the low-temperature superconducting magnet, utilizing the advantages of high tensile strength and high critical currents of high-temperature superconductors under high magnetic fields.   

The researchers has focused on the research of high-field high-temperature superconducting insert magnet and has developed 24.0T, 25.7T, and 27.2T all-superconducting magnets in the past years. The extremely-high magnetic field superconducting magnet, which constructed recently, produced a central magnetic field of 32.35 T in liquid helium bath, and realized the stable operation of the 32.35T all-superconducting magnet.  

The high-field superconducting magnets will serve the world-class Synergetic Extreme Condition User Facility (SECUF), and will provide the most advanced high magnetic field experimental conditions for basic research and applied research in the exploration of new states of matter, new phenomena, and new laws in material science. 

The excitation process of the 32.35 T all-superconducting magnet (Image by LIU Jianhua)