Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2014, Vol. 25 ›› Issue (2): 020401 doi: 10.13538/j.1001-8042/nst.25.020401


Implementation and integration of a systematic DBPM calibration with PLL frequency synthesis and FPGA

SUN Xu-Dong, LENG Yong-Bin   

  1. 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Contact: LENG Yong-Bin
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SUN Xu-Dong, LENG Yong-Bin . Implementation and integration of a systematic DBPM calibration with PLL frequency synthesis and FPGA.Nuclear Science and Techniques, 2014, 25(2): 020401     doi: 10.13538/j.1001-8042/nst.25.020401


Beam current dependence resulted from nonlinearity and asymmetry of the four channels of digital BPM (Beam Position Monitor) processor deteriorates the BPM performance. A systematic solution based on signal source calibration tactics has been carried out to rectify this defect. It is optimized for implementation in FPGA. Mathematical illustrations of the calibration method, hardware and software design and implementation are presented. A signal source circuit using frequency synthesis technique is designed as calibration standard. Data acquisition system using JAVA web technology and Ethernet is introduced. Integrated FPGA implementation code architecture is presented, and experimental test results show that the method implemented in FPGA is feasible. Compared to other methods, our approach can rectify the nonlinearity and asymmetry simultaneously. The whole solution is integrated into the DBPM processor and can be executed online.

Key words: Digital Beam Position Monitor (DBPM), Beam current dependence calibration, Frequency synthesis RF circuit, Numerical interpolation method, FPGA, Ethernet Java Web data acquisition