Design of a 70T Quasi-Continuous High Magnetic Field System with a Dual-Coil Magnet

As a significant research method, quasi-continuous high magnetic field (QCHMF) can meet scientific experimental requirements for higher magnetic intensity, longer flat-top pulsed width and lower ripple in physics, biology and other scientific fields. In this paper, a QCHMF system designed by many-objective optimization method is presented to obtain the magnetic intensity of 70T. The magnet system consists of two coils, the inner coil is energized by the 100 MVA/100 MJ generator-rectifier power supply and the outer coil is powered by a 22 MJ capacitor power supply. To reduce the adjusting difficulty of the QCHMF, a decoupling transformer is designed. Moreover, a self-adaptive PI controller is used to reduce the ripple of the QCHMF. The MATLAB/Simulink and COMSOL Multiphysics are adopted to establish the equivalent model of QCHMF system and the simulation result presents the system can generate 70T/100 ms flat-top pulse has the ripple less than 1300 ppm.