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Lang, K.

Paper Title Page
TUP002 Performance Tests of Digital Signal Processing for GSI Synchrotron BPMs 79
  • K. Lang, P. Forck, T. Hoffmann, P. Kowina, U. Rauch
    GSI, Darmstadt
  • G. JanÅ¡a
    Cosylab, Ljubljana
  The Beam Position Monitoring System at GSI heavy ion synchrotrons consists of twelve stations. Each of the four BPM plates is connected to a Libera Hadron unit from I-Tech Company for digitization and position calculation. The raw data of one BPM sampled by 125 MS/s with 14 Bit ADCs are reduced to about 20 MB/s by the onboard FPGA, resulting in a bunch-by-bunch position readout. In addition, different timing signals with various requirements are used to verify the functionality of the FPGA algorithms. For a closed orbit measurement, the data of all twelve Liberas have to be read in parallel. For communication, the Xilinx Rocket IOs is used, that allows up to 1GBit/s data output. Over a dedicated network, the data are merged for further usage on a high performance PC. We describe the general architecture and present first performance tests.