Author: Tian, X.C.
Paper Title Page
WEPC16 The Design of BPM Electronic System for CSNS RCS 706
 
  • W. Lu, H.Y. Sheng, X.C. Tian, J.W. Zhao, Y.B. Zhao
    IHEP, Bejing, People's Republic of China
  
  A Beam Po­si­tion Mon­i­tor (BPM) sys­tem has been de­signed for the Rapid Cy­cling Syn­chro­tron (RCS) at the China Spal­la­tion Neu­tron Source (CSNS) to ac­quire beam po­si­tion in­for­ma­tion. This ar­ti­cle in­tro­duces the de­sign and im­ple­men­ta­tion of the BPM elec­tronic sys­tem. The chal­lenge of de­sign­ing the BPM elec­tron­ics is to ac­quire and process the sig­nal with large dy­namic range (5.8mV~32V) and chang­ing width (80ns to 500ns). The ana­log cir­cuit de­scribed in this paper, which is con­structed of a sin­gle-stage op­er­a­tional am­pli­fier and an ana­log switch, can cover the input sig­nal with large dy­namic range. Be­cause of the min­i­mum bunch length (80ns) and the re­quire­ment of po­si­tion res­o­lu­tion, a 14 bit 250MHz ADC is adopted to dig­i­tize the sig­nal. Be­sides, for BPM sys­tem, the de­mand of an ac­cu­rate real-time po­si­tion mon­i­tor­ing is manda­tory. The al­go­rithm de­vel­oped in an FPGA is able to make Bunch-by-Bunch po­si­tion cal­cu­la­tion and Closed Orbit po­si­tion cal­cu­la­tion in real time. Also, some pre­lim­i­nary test re­sults will be pre­sented and dis­cussed, which show that the res­o­lu­tion of Bunch-by-Bunch po­si­tion is 0.8mm when the input sig­nal is 5.8mV and the res­o­lu­tion of Closed Orbit po­si­tion is 50um.  
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