Terminal voltage control system for 5.5 MV electrostatic accelerator

A terminal voltage control system with a generating voltmeter for electrostatic accelerator was developed. The circuit of the system was designed and made, which mainly consists of a notch filter, a band filter, an error amplifier and a corona control circuit. The notch filter was designed in the type of TT with the notch frequency about 50 Hz.The center frequency of the band filter was 35 Hz with a bandwidth of 60 Hz. The output of the circuit was 0~10 V which was used to control the corona discharge current. The energy spectrum and the radius of the single ion microbeam were measured. The results indicated that the instability of the terminal voltage was obviously eliminated to less 1%, and the spot radius of the single ion microbeam was smaller than previous.