Ramping particle current power supply

Ramping power supplies for booster synchrotrons have to provide high quality current with well-defined waveforms for the sake of enhancing the injection particle current performance. A new ramping power supply which employs IGBT modules operating at higher switching frequency than the old GTO-based system is constructed at NSRRC. By this revamping, not only the produced total harmonic distortion of the current waveform can be improved; the injection and extraction efficiency of the booster ring can also be elevated. The measured dynamic range of the 10Hz sine wave current output of the new ramping power supply is better than 75dB and total harmonic distortion (THD) is less than 0.015%.