Design of a 20 T Pulsed Magnet for the Pulsed Field Magnetometer

In this article, a pulsed magnet with a magnetic field of 20 T is proposed for pulsed field magnetometry. The hysteresis curve is calculated by the pulsed field magnetometry according to measure the magnetic flux changes in two different pulse periods. This technique has the advantages of short measurement time and a high magnetic field. The dual-coil structure is used in the pulsed magnet, of which the circuit parameters are calculated and designed. The pulse amplitude of the pulsed magnetic field is constant at long and short pulses, with pulse periods of 8.3 ms and 15.9 ms, respectively. At the current of 11.89 kA at the short pulse and 8.51 kA at the long pulse, the magnetic field is 20 T. The maximum temperature rise of the magnet is 41 K, and the maximum von Mises stress is 622 MPa, meeting the design requirements. The testing experiments of the pulsed magnet are conducted at pulse periods of 8.2 ms and 15.9 ms, and the magnetic field reaches 13.35 T at present. The experiment results agree well with the simulation.