Mcsmear updates
Contents
Tasks
- Dead channel handling - Sean
- Smearing updates - Detector groups
- See below
- Run-dependent values from RCDB - Sean & Dmitry
- Mixing Simulated Events
Per-Channel Efficiency
Efficiencies for simulated data should match those of real data when possible. To start with, we will compare hit-level efficiencies. To match simulated and real data efficiencies, we will calculate correction factors. These factors will have values between 0 and 1, and we will randomly drop hits at a rate of (1-factor).
The following principles should be followed when determining these factors:
- Efficiencies should not be set to zero unless the channel was actually disabled during the runs
- Efficiencies should be determined for each channel.
- Efficiencies should be determined either on a run-by-run basis or as an average over a group of runs
- Efficiencies should be determined in way that is unbiased by the trigger
New Tables
These tables contain factors to modulate the efficiency of each channel in order to match the data.
- FCAL/block_mc_quality
- CDC/channel_mc_quality
- START_COUNTER/paddle_mc_quality
- BCAL/channel_mc_quality
- FDC/package[1-4]/wire_mc_quality
- FDC/package[1-4]/strip_mc_quality
- TOF/paddle_mc_quality
Current Settings
Will set table fields to "green" when updated.
Should load parameters from CCDB where possible.
General Comments
Smearing is performed by adding a Gaussian function, unless otherwise described.
TRIGGER_LOOKBACK_TIME = -100 ns
Should we properly model readout windows?
CDC
name | value | comment |
---|---|---|
CDC_TIME_WINDOW | 1000. | readout window (ns) |
CDC_PEDESTAL_SIGMA | 50.0 | charge smearing factor |
CDC_THRESHOLD_FACTOR | 4.0 | sparsification threshold = CDC_THRESHOLD_FACTOR* CDC_PEDESTAL_SIGMA |
CDC_TDRIFT_SIGMA | 2.8181818181818e-9 | drift time smearing width*1.0e-9 (ns) |
HDGeant calculations that need revisiting:
- longitudinal drift
- gain
CDC Threshold Calculation
threshold = CDC_THRESHOLD_FACTOR * CDC_PEDESTAL_SIGMA
FDC
name | value | comment |
---|---|---|
FDC_TIME_WINDOW | 1000. | readout window (ns) |
FDC_CATHODE_SIGMA | 150.0 | cathode charge smearing factor |
FDC_PED_NOISE | -> | charge smearing factor = -0.0938 + 0.0485*FDC_CATHODE_SIGMA |
FDC_THRESHOLD_FACTOR | 4.0 | sparsification threshold = FDC_THRESHOLD_FACTOR * FDC_PED_NOISE |
FDC_TDRIFT_SIGMA | 1.0-9 | drift time smearing width*1.0e-9 (ns) [both wire and cathode] |
HDGeant calculations that need revisiting:
- wire drift calculation?
- lorentz effects?
FCAL
name | value | comment |
---|---|---|
FCAL_BLOCK_THRESHOLD | 0.02 | (GeV) |
time smearing | 200. | fixed in mcsmear (ps) |
FCAL_PHOT_STAT_COEF | 0.035 | |
energy smearing | -> | 1.0 + Gaussian( FCAL_PHOT_STAT_COEF / sqrt(E) ) |
BCAL
name | value | comment |
---|---|---|
BCAL_TWO_HIT_RESOL | 50. | |
BCAL_ADC_THRESHOLD_MEV | 1. | |
BCAL_FADC_TIME_RESOLUTION | 0.3 | (comment: to be updated) |
BCAL_TDC_TIME_RESOLUTION | 0.3 | (comment: to be updated) |
BCAL_SAMPLINGCOEFA | 0.042 | |
BCAL_SAMPLINGCOEFB | 0.013 | |
BCAL_MEV_PER_ADC_COUNT | 0.029 |
TOF
name | value | comment |
---|---|---|
TOF_SIGMA | 0.155563 | time smearing factor |
TOF_PHOTONS_PERMEV | 8000. | conversion factor |
dE smearing | -> | Gaussian(sqrt(npe)) |
TOF_THRESH_MEV | 0 | threshold on smeared dE |
START COUNTER
name | value | comment |
---|---|---|
START_SIGMA | 0.3 | time smearing factor |
START_PHOTONS_PERMEV | 200. | conversion factor |
dE smearing | -> | Gaussian(sqrt(npe)) |
STC_THRESH_MEV | 0 | threshold on smeared dE |
TAGM
name | value | comment |
---|---|---|
TAGM_TSIGMA | 0.200 | TDC smearing factor |
TAGM_FADC_TSIGMA | 0.350 | fADC smearing factor |
TAGM_NPIX_PER_GEV | 1.e5 | poisson smearing |
TAGH
name | value | comment |
---|---|---|
TAGH_TSIGMA | 0.350 | TDC smearing factor |
TAGH_FADC_TSIGMA | 0.450 | fADC smearing factor |
TAGH_NPIX_PER_GEV | 5.e5 | poisson smearing |
PS
name | value | comment |
---|---|---|
PS_SIGMA | 0.200 | time smearing factor |
PS_NPIX_PER_GEV | 1.e5 | poisson smearing |
PSC
name | value | comment |
---|---|---|
PSC_SIGMA | 0.200 | time smearing factor |
PSC_PHOTONS_PERMEV | 5.e5 | Gaussian smearing |