Fast corrector power supply design for HEPS

BackgroundHigh-energy photon source under construction is a fourth-generation synchrotronradiation light source with energy of 6 Gev and ultra-low emittance (lower than 0.1 nm rad). The ultra-low beam emittance requires high beam stability.
PurposeIn order to meet this requirement of low beam emittance, the fast close orbit correctionsystem is used to keep beam on the right orbit. The fast close orbit correction system need fast corrector power supply to drive the calibration magnet to complete track correction. So, a fastcorrector power supply prototype with high bandwidth and low current ripple to improve the performance of the fast close orbit correction system to prove the high beam stability had beendeveloped.
MethodsThe prototype use a novel multilevel switch-mode structure to provide the dynamicrequirement. The prototype adopts FPGA for full-digital control and use high-speed ADC with temperature control. By using a precision sampling circuit (ADC+DCCT), the prototypeoutputs current ripple can meet the requirement.
Results and conclusionThe designed for HEPS meet the design requirement. Through test, the prototype has asmall signal bandwidth of 10 kHz and output current ripple lower than 20 ppm.