A low ripple power supply for high-current magnet load

The magnet power supplies provide precisely controlled current to the magnets in particle accelerators. As the research in high-energy physics progresses, the required precision of the magnet current is increasing rapidly. Existing magnet power supplies for high-current applications cannot meet the present and future demands. This paper proposes a new magnet power supply for high-current magnets. The proposed system integrates a switch-mode ripple regulator with a phase-controlled rectifier. The results from this paper indicate that the proposed system can provide a magnet current with less than 10 ppm harmonic content and can be expected to have fast dynamic response. In this paper, the general description of the power circuit and system control configuration is presented. Fourier analysis is applied to investigate the harmonic content of the magnet current. The theoretical analysis is verified experimentally. A design example is given