Abstract

High-stability flat-top pulsed magnetic field, which combines the advantages of pulsed high magnetic field and steady high magnetic field, is widely used in in the fields of physics, biology, and chemistry. The pulsed alternator-rectifier power supply, with controllable output voltage, is suitable to discharge a multi-coil magnet to generate a synthetic flat-top magnetic field with high parameters. However, the coupling characteristics of coil current and the time-varying non-linear characteristics of magnetic field system bring challenges to generate a high-stability flat-top pulsed magnetic field. This paper firstly adds a decoupling transformer in discharge circuit of the 50 T flat-top pulsed magnetic field system. Then a control method based on the model predictive control is proposed. A simulation model is built by MATLAB/Simulink to simulate the discharge process, and a 50 T/120 ms flat-top pulsed magnetic field with an accuracy of 400 ppm is generated.

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