ACD Carbon Peak calibrations
Purpose and use
To measure the PHA signal for a Carbon Ion at normal incidence for each PMT.
This calibration is used in the configuration system to set the signal scale for the CNO thresholds.
This calibration is used in reconstruction to express the raw PHA values in terms of MIP equivalent signals and eventually in MeV.
This calibration is used in simulation to provide realistic PHA values.
Required inputs
200 or more Carbon ions per tile.
Generally 4 days running in nomSciOps configuration.
Needs a good high range pedestal calibration.
Descriptions of algorithm for one PMT
- Select only event with a carbon signature in the CAL
- Take events where a track points to a tile with a signal
- Subtract the pedestal value from the PHA
- Correct the signal for the track incident angle and histogram that value
- Scan the histogram for a peak away from 0 (need to remove low energy noise).
- Fit a gaussian over the peak region
- Take the mean and sigma of the Gaussian as the calibration parameters
Special Instances
All Calibrations
- First Light runs
080630
- Data from Mission week 4
080706
- Data from Mission week 5
080713
- Data from Mission week 6
080720
- Data from Mission week 8
080808
- Data from Mission week 9
080814
- Data from Mission week 12
080904
- Data from Mission week 10
080821
- Data from Mission week 18
081014
- Data from Mission week 16
081002
- Data from Mission week 24
081124
- Data from Mission week 22
081113
- Data from Mission week 20
081030
- Data from 0808-0812
0808XX
- Data from Mission week 30
090108
- Data from Mission week 28
081225
- Data from Mission week 32
090122
- Data from Mission week 36
090219
- Data from Mission week 38
090305
- Data from Mission week 34
090205