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Accelerators require extremely precise high-current magnet power supplies to drive their magneto-optic devices for proper beam dynamics. The dc precision of the power supply, which generally defines the absolute tolerance of its current, can be split up into three distinct parts — ripple, short-term and long-term stability. To ensure that the output current is within an error-band of 10ppm or less, a three-loop regulation topology has been developed and implemented in a high current magnet power supply (750A/12V) that uses transistor bank as the series pass element.
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