ECAL - Slew Rate

Introduction

• Summary slides (by Tommaso)
• Talk by S. Ledovskoy
• ECAL Time Response Twiki

Samples

WZEG skim:

• /EG/Run2010A-WZEG-Nov4Skim_v1/RAW-RECO
• /Electron/Run2010B-WZEG-Nov4Skim_v1/RAW-RECO

Our reduced ntuples available here:

• /castor/cern.ch/user/d/deguio/ECAL/SlewRate/

Selections

Select all rec hits in EB with gain switch at the max sample. Example of code to analyze the ntuples here

Some Results:

1. Example of pulse shape.

• Fit with EB shape from TB. Pedestal fixed, free parameters A_max and T_max. The sample before the max sample is excluded from the fit.

2. Observed amplitude of the sample before max vs expected amplitude.

• The expected amplitude is estimated from the amplitude of the max sample as
  A_max-1 ^exp = A_max*f(max-1)/f(max),
  where f is the TB shape fitted to the samples, excluding the sample before max.
• slew rate limit around 3750 ADC counts
• indication of non linearity above 3500 ADC counts

3. Expected and observed amplitude of the sample before the max as a function of T_max

-- MartinaMalberti - 06-Jan-2011