Abstract
For the 1.5GeV energy injector upgrade project for the NSRRC synchrotron light source, new ramping power supplies were implemented in the “White circuit” booster synchrotron ring. IGBT semiconductors operating at a higher frequency was employed to replace the older GTO-based system. The new system enabled reduction of the current waveform harmonic distortions and thus improving the injection and extraction efficiency. The increased reliability increased blind power from circuit mistuning also ensures higher system uptimes. The measured dynamic range of the 10 Hz sine wave current output of the new ramping power supply is shown to be better than 75 dB with a total harmonic distortion (THD) less than 0.015 %. From the monitored beam current, the low THD dipole magnets current can greatly improve the stability of the booster beam current.
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