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Capacitive coupling measurements.

Capacitive coupling measurements. G. Vidal-Sitjes, J. Burguet-Castells, J.J. Gomez-Cadenas, A.M. Tornero Lopez. Reminder of the model. Example: bidirectional cross-talk. TPC pads, probe, DAQ. Signal reconstruction: phase-lock technique. One sector analyzed 645 alive channels (out of 662).

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Capacitive coupling measurements.

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  1. Capacitive coupling measurements. G. Vidal-Sitjes, J. Burguet-Castells, J.J. Gomez-Cadenas, A.M. Tornero Lopez. HARP Collaboration Meeting

  2. Reminder of the model HARP Collaboration Meeting

  3. Example: bidirectional cross-talk TPC pads, probe, DAQ HARP Collaboration Meeting

  4. Signal reconstruction: phase-lock technique One sector analyzed 645 alive channels (out of 662) HARP Collaboration Meeting

  5. HARP Collaboration Meeting

  6. HARP Collaboration Meeting

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  10. HARP Collaboration Meeting

  11. Observation • Huge spread of channels electronic gain • 2.5 daughter channels per channel • 79% of parent charge appears in other pads • 1237 cross-talk relations (all orders) HARP Collaboration Meeting

  12. Order of the cross-talk signals. HARP Collaboration Meeting

  13. First order relations Map of first order relations = map of couplings HARP Collaboration Meeting

  14. Relations relative position R PHI ROW HARP Collaboration Meeting

  15. Number and position of the parents position of clean channels ~325 clean channels HARP Collaboration Meeting

  16. Fitting the capacities & subtracting the XT signals HARP Collaboration Meeting

  17. Assessment of the cross-talk effect on the TPC data with a fast MC simulation. G. Vidal-Sitjes, J.J. Gomez-Cadenas. With many thanks to Lara Scotchmer and Alexander Grossheim HARP Collaboration Meeting

  18. rΦ resolution. ANALOG signals. non equalized cross-talk both σ=1.8 mm σ=0.6 mm σ=1.6 mm HARP Collaboration Meeting

  19. rΦ resolution. DIGITIZED data (no threshold) non equalized cross-talk both σ=1.8 mm σ=0.6 mm σ=1.5 mm HARP Collaboration Meeting

  20. Energy resolution. Analog signals. non equalized cross-talk both σ=44% σ=13% σ=7% HARP Collaboration Meeting

  21. Energy resolution. Digitized data. (no threshold) digitization 9% non equalized 17% all: 40% cross-talk 14% HARP Collaboration Meeting

  22. Summary rΦ Energy HARP Collaboration Meeting

  23. Conclusions • Capacitive model applied to a full sector. • Model describes well all data, including bidirectional and all orders cross-talk. • Model fully specified by transfer functions (MEASURED) and by capacitances (COMPUTED) • 92% of cross-talk reduced on this data • ½ of the channels are clear. Assessment of performances without cross-talk ongoing. • MC result shows that the effect is 1.5 mm in resolution and 15% in energy resolution. HARP Collaboration Meeting

  24. Outlook • Apply correction algorithm on data and MC and compare residuals and energy resolution before and after correction. • Prepare benchmark set of data to compare the performances of existing algorithms (resolution, minimum bias, speed…). • Choose the best combination of algorithms (require/expect close cooperation among different groups) HARP Collaboration Meeting

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