Modification of the correction bipolar power supply of the storage ring

To satisfy performance 1.5 GeV beam current requirement in storage ring, the correction power supplies´ output current ripple have to be low enough from 0 Hz to 10 kHz. To suppress the output current ripple noise from 0 Hz to 10 kHz, the correction power supplies must be modified from the normal frequency response to higher bandwidth to make the beam current performance in storage ring better. The controller gain of the correction power supplies is changed to detect the high frequency dynamic current ripple. A control gain modification scheme is presented here and the correction power supply with control gain modified have been proven to exhibit excellent output current ripple reduction from 0 Hz to 10 kHz. Results and measured performance will be presented in this paper.