Author: Leng, Y.B.
Paper Title Page
MOP174 The Study and Implementation of Signal Processing Algorithm for Digital Beam Position Monitor 414
 
  • L.W. Lai, Z.C. Chen, Y.B. Leng, Y.B. Yan, G.S. Yang
    SSRF, Shanghai, People's Republic of China
  • X. Yi
    SINAP, Shanghai, People's Republic of China
 
  Digital beam position monitor (DBPM) system is one of the most important beam diagnostic instruments generally used in modern accelerators. The performance of DBPM is mainly given by its digital signal processing algorithm. In order to find out a better solution for our new DBPM system, two algorithms have been designed and implemented on a commercial FPGA based DAQ module (ICS1554) to retrieve the turn-by-turn (TBT) data. The first algorithm is based on frequency mixing, and the second one on discrete Fourier transform (DFT). Laboratory tests show that the standard deviation of measured positions can be better than 1μm at 5 dBm with input signal stronger than 5 dBm for both algorithms. And on-line evaluation indicates that real beam motion can be observed correctly using either algorithm.