Development and Progress in High Field Pulsed Magnet of the WHMFC

The second phase construction of the Wuhan High Magnetic Field Center (WHMFC) is currently underway, aiming to comprehensively upgrade the systems developed during the first phase. The capacitor bank capacity will be increased from 28 MJ to 167 MJ, supporting the development of new pulsed magnets, including a 110 T magnet with a 10 mm bore and a 70 T flat-top magnet sustaining 10 ms within a 14 mm bore. A flat-top pulsed magnet was designed and fabricated based on the principle of sequential discharge of multiple capacitor banks, achieving a peak magnetic field of 71.36 T, a duration of 12.11 ms, and a flatness of 0.39%. An axially stacked high-field pulsed magnet configuration is proposed, which effectively mitigates strong electromagnetic coupling. Additionally, a novel pancaketype magnet structure with radial reinforcement has been proposed. Compared to traditional hoop-strengthened designs, this structure offers significantly improved reinforcement efficiency.