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Physics Pulse Shapes

Physics Pulse Shapes. A first look with a handful of Luminosity Blocks. Reminder: FIR coefficients. Our final calibration depends on the Filters used We are using a simplified set of coefficients Suggested by David Hadley Based on calibration pulse shapes

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Physics Pulse Shapes

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  1. Physics Pulse Shapes A first look with a handful of Luminosity Blocks Physic Pulse Shapes

  2. Reminder: FIR coefficients • Our final calibration depends on the Filters used • We are using a simplified set of coefficients • Suggested by David Hadley • Based on calibration pulse shapes • Big question: do calibration pulses = physics pulses • FIR coefficient sets • EM layer: 1, 8, 13, 10, 7 • Hadronic layer: 1, 9, 15, 11, 5 • FCAL (all layers): 0, 2, 13, 5, 0 Physic Pulse Shapes

  3. Analysis ‘technique’ • Raw data from run 160800 • About 5 luminosity blocks of Jet/Tau/Etc stream • Start of fill, so high luminosity • Lots of big pulses • Use only pulses with maximum FADC > 60 • Similar to timing analysis cuts • Average pulse shape by (major) partition • EMB, EMEC, HEC, Tile, FCAL • As always FCAL has the last laugh… Physic Pulse Shapes

  4. EM layer Physics pulses (marginally) narrower (n-2) sample close to zero Physic Pulse Shapes

  5. Hadronic layer HEC pulses (marginally) narrower (n-2) sample close to zero For HEC Tile almost perfect Physic Pulse Shapes

  6. FCAL – the joker in the pack ALL pulses are wider FCAL2+3 (hadronic) are particularly wide Physic Pulse Shapes

  7. Conclusions • Differences between calibration and physics pulses will distort FADC to LUT energy conversion • Will eventually require recalibration of LUT slopes • Also maybe re-evaluation of FIR coefficients • For the future (but when?) • Main effects for now should be: • Tile is about right • EM will be underestimated in LUT value • FCAL will be overestimated in LUT value • Is this all backed up by Yuriy/Juraj’s observations? Physic Pulse Shapes

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