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Digital Signal Analysis for BPMs

Digital Signal Analysis for BPMs. The Project Measure beam trajectories and orbits in hadron machines Specific problems: Varying revolution frequency, changing harmonic number The Principle Fast digitization, signal treatment on the fly using FPGA and big memory. BLR GATE LO .

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Digital Signal Analysis for BPMs

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  1. Digital Signal Analysis for BPMs • The Project • Measure beam trajectories and orbits in hadron machines • Specific problems: Varying revolution frequency, changing harmonic number • The Principle • Fast digitization, signal treatment on the flyusing FPGA and big memory U. Raich CERN AB/BI

  2. BLR GATE • LO • . • Loop Gain Fmax Fmin BASELINE RESTORER INTEGRATOR Δ ADC MEMORY CONTROLLER DDR II SDRAM MEMORY BASELINE RESTORER INTEGRATOR ∑ ADC C timing POINTER MEMORY & SYNCHRONISATION CLOCK DISTRIBUTION HC timing INJ timing ST timing FILTER PHASE TABLE ETHERNET INTERFACE DDS ARM SINGLE BOARD COMPUTER EMBEDDED SIGNAL ANALYSER CHIPSCOPE ANALYSER JTAG Local Bus REGISTER SET The System Architecture U. Raich CERN AB/BI

  3. Results of measurements The raw BPM signal, The integration gate The baseline corrected signal U. Raich CERN AB/BI

  4. Sum Relative position • Problems: Still too much noise • Could be due to • Not good enough baseline correction • Too low sampling frequency (60 MHz) • gate position Position Calculations Difference U. Raich CERN AB/BI

  5. The PLL Evolution of revolution frequency along the accelerator cycle U. Raich CERN AB/BI

  6. To be done for CERN team • Run the algorithms on the final prototype • Improve position noise • Increase sampling frequency • Test the system during transition and for harmonic number changes • Multiply the no of channel by 40 • Design and implement readout and application programs • Tests on SIS-18 (next Monday and Tuesday) U. Raich CERN AB/BI

  7. Measurements of GSI team at CERN PS Injection of SFTPRObeam into the PS • Gate is aligned • Gate length varies 23-26 clocks U. Raich CERN AB/BI

  8. Double Batch Injection U. Raich CERN AB/BI

  9. Harmonic Number Changes U. Raich CERN AB/BI

  10. Bunch Splitting Algorithms recognizes 6 bunches When will it switch to 18? U. Raich CERN AB/BI

  11. Nice progress but still not there • Hardware development ready. • Big progress on algorithm has been made but we are still not there • Tender took longer than expected and we will need more time (but not more money) to complete the project • Measurements on a single electronic was successful but need still further improvement • Complete system will be tested in 2007 in parallel to the existing system at CERN • Final report should be ready end of 2007 U. Raich CERN AB/BI

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