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fast corrector power supply design for HEPS

Radiation Detection Technology and Methods 2020年第1期4卷 56-62页

作者： Peng Liu Xu Wang Fengli Long Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Background High-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 *** In order to meet this requirement of low beam emittance,the fast close orbit correctionsystem is used to keep beam on the right *** fast close orbit correction system need fast corrector power supply to drive the calibration magnet to complete track ***,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 *** The prototype use a novel multilevel switch-mode structure to provide the *** prototype adopts FPGA for full-digital control and use high-speed ADC with temperature *** using a precision sampling circuit(ADC+DCCT),the prototypeoutputs current ripple can meet the *** and conclusion The designed for HEPS meet the design *** test,the prototype has asmall signal bandwidth of 10 kHz and output current ripple lower than 20 ppm.

关键词： HEPS fast corrector High bandwidth Low output current ripple Full-digital control MATLAB simulink

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A precision sampling system for fast corrector power supply of photon source

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Radiation Detection Technology and Methods 2023年第1期7卷 139-148页

作者： Peng Liu F.L.Long Y.Z.Du Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China

Purpose At present,the high-energy photon source(HEPS)is under construction in *** has beam emittance lower than 40 pm *** order to ensure low beam emittance,a high-performance fast orbit feedback system(FOFB)is designed for fast and accurate correction of beam *** FOFB needs to have the smallest adjustment ***,as the execution unit of the FOFB system,the output current resolution of the fast corrector power supply needs to be as small as *** FOFB systems,precise correction of beam orbit is required for fast corrector power supply with output current resolution better than 60μA.A precision digital sampling system needs to be designed to meet the high requirements of output current *** The precision operational amplifier is used to complete the scaling and sampling of *** precision operational amplifier is used as the front-end processing in the circuit design to complete the amplitude processing and ***,the precision operational amplifier is used as the driver of the precision analog to digital converter(ADC)chip.A precision ADC chips based on oversampling technology is *** this scheme,the selected ADC chip can have the advantages of both high speed and high precision.A simulation prototype is built for test,and the performance parameters of key chips in the design are *** A precision voltage reference is used to test the designed digital sampling *** test results showed that the acquisition system has an effective resolution of 21.6 *** HEPS fast corrector power supply is used for testing the developed precision sampling *** test result showed that the output current resolution of fast corrector power supply is lower than 16μA.

关键词： Photon source FOFB fast corrector High precision Over sampling ADC High resolution

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