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The current pulses for the ring magnet of the Zero-Gradient Synchrotron are supplied by the a-c generators of a large M-G set through four groups of rectifier units, which are operated alternately as power rectifiers and power inverters. The exchange of stored energy between the magnet and the M-G set limits the current swing taken by the driving motor from the incoming power supply. The pulsing is programmed by phase control of the rectifiers, which is effected by a variable d-c bias voltage. The power and control circuits are described, several design problems are outlined, and some operating results are given.