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Analysis of Tower Driver Calibration Signal Waveforms at CERN HEC Module

This study by E. Ladygin focuses on calibration signals at CERN using Tower Driver for HEC modules, measuring delays, signal saturation, noise, and autocorrelation. Findings highlight delay disparities, saturated signal presence, and noise analysis.

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Analysis of Tower Driver Calibration Signal Waveforms at CERN HEC Module

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  1. Tower Driver CERN scope measurement March ‘05 E.Ladygin

  2. Points of measurement HEC quadrant structure E.Ladygin

  3. Signal waveforms : towers - A2, A3, A4, A5 E.Ladygin

  4. Signal waveforms : towers – A6,A7,A8,A9 E.Ladygin

  5. Signal waveforms : towers – A10,A11,A12,A14 E.Ladygin

  6. Calibration signal delays in a HEC module E.Ladygin

  7. Signal saturation E.Ladygin

  8. TDB output noise waveform E.Ladygin

  9. Noise autocorrelation function E.Ladygin

  10. Summed signal E.Ladygin

  11. Conclusion 1 • Calibration signal waveforms should be computed for the time constants and amplification and compared with expected signals E.Ladygin

  12. Conclusion 2 • Calibration delay time distribution has been measured • Maximal difference between delays in a module is about 17ns • Maximal difference between delays in a longitudinal segment is about 9ns (~1.8m) E.Ladygin

  13. Conclusion 3 • Saturated signal has been measured • No surprise E.Ladygin

  14. Conclusion 4 • Noise has been measured – here is seen the big digital pickup noise, mainly 40MHz • Where is from? FEB? Trigger system by the cable to the oscilloscope? E.Ladygin

  15. Conclusion 5 • Has been found that the numbering of mixer channels is not the same on both side of FEB, there is mirror sequence • J.Ban promised that every mixer can be programmed separately • We need a cable check program for trigger chain E.Ladygin

  16. Thank you E.Ladygin

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