Fast corrector power supply design for HEPS
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High-energy photon source under construction is a fourth-generation synchrotron radiation 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.
In order to meet this requirement of low beam emittance, the fast close orbit correction system 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 fast corrector 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 been developed.
The prototype use a novel multilevel switch-mode structure to provide the dynamic requirement. 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 prototype outputs current ripple can meet the requirement.
Results and conclusion
The designed for HEPS meet the design requirement. Through test, the prototype has a small signal bandwidth of 10 kHz and output current ripple lower than 20 ppm.
KeywordsHEPS Fast corrector High bandwidth Low output current ripple Full-digital control MATLAB simulink
- 2.B. Song, J. Wang, “Mathematical modeling and analysis of a wide bandwidth bipolar power supply for the fast correctors in the APS upgrade controller. in Proceedings of 6th International Particle Accelerator Conference (IPAC’15), Richmond, VA, USA, May 2015, pp. 3264–3266. https://doi.org/10.18429/jacow-ipac2015-wepty004