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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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Presentation Transcript
physics pulse shapes

Physics Pulse Shapes

A first look with a handful of

Luminosity Blocks

Physic Pulse Shapes

reminder fir coefficients
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

analysis technique
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

em layer
EM layer

Physics pulses

(marginally)

narrower

(n-2) sample

close to zero

Physic Pulse Shapes

hadronic layer
Hadronic layer

HEC pulses

(marginally)

narrower

(n-2) sample

close to zero

For HEC

Tile almost

perfect

Physic Pulse Shapes

fcal the joker in the pack
FCAL – the joker in the pack

ALL pulses

are wider

FCAL2+3

(hadronic) are

particularly wide

Physic Pulse Shapes

conclusions
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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