The SPS auxiliary magnet power supplies

A functional description is given of these thyristor power supplies- many of which are of the bipolar type without circulating current-with emphasis on the CERN-developed regulation circuits. A detailed analysis is given of a new thyristor gate control with low subharmonic content and fast response over a wide rectifier output range. A current regulation time constant of 14 msec is maintained even at near-zero output, where the thyristors conduct only during a small fraction of each cycle.