CCDB Tables CDC

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Variations

There are no interesting variations at the moment.

Tables

CDC/timing_offsets

1-3522 timing offset, t0 (ns)

CDC/wire_gains

1-3522 gain correction factor

CDC/pedestals

1-3522 ADC pedestals

CDC/wire_alignment (3522 rows)

dxu upstream wire end displacement - X
dyu upstream wire end displacement - Y
dxd downstream wire end displacement - X
dyd downstream wire end displacement - Y

CDC/alignment

CDC_ALIGN_UPSTREAM_DZ upstream endplate z displacement
CDC_ALIGN_DOWNSTREAM_DZ downstream endplate z displacement
CDC_SAG_RADIUS

CDC/cdc_drift_table (78 rows)

t drift time (μs) in 100 micron steps


CDC/MC/drift_func_parms

CDC_DRIFT_A Transverse drift function parameters
CDC_DRIFT_B
CDC_DRIFT_C
CDC_DRIFT_D
CDC_DRIFT_A_L Longitudinal drift function parameters
CDC_DRIFT_B_L
CDC_DRIFT_C_L
CDC_DRIFT_D_L

CDC/fit_parms

CDC_VARIANCE_A Kalman filter parameters
CDC_VARIANCE_B
CDC_VARIANCE_C

CDC/cdc_parms

CDC_TDRIFT_SIGMA 2.8181818181818e-9 The error on the drift time in the CDC, used to gaussianly smear actual CDC hits.
CDC_TIME_WINDOW 1000.0E-9 The time window for which CDC hits are accumulated (in sec), used for background determination
CDC_PEDESTAL_SIGMA 0.00000006 The error in the energy deposition measurement in the CDC due to pedestal noise
CDC_DRIFT_SPEED 0.0055 CDC drift speed (unit?)
CDC_TWO_HIT_RESOL 25. time window for two hit resolution (in ns)
CDC_MAX_HITS 100 number of hit per readout channel
CDC_THRESH_KEV 1. threshold applied (in KeV)
CDC_STRAW_RADIUS 0.8 straw radius (in cm)

Deprecated

The following tables/variations should not be used anymore:

  • CDC/cdc_drift - parameterized time-to-distance function
  • CDC/cdc_gas_drift
  • CDC/drift_parms

These are (not anymore) interesting variations related to the CDC:

  • CDC_8mm_0T, CDC_9mm_0T, CDC_10mm_0T - versions of time-distance tables for different sized straws, no magnetic field. only 25 tables generated, with mixtures of 47/53 to 53/47 of Ar/CO2, in 0.25% increments.