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

List of calibrations

Special Instances

In use in ConfigSystem under alias "calibGenACD": 081208 080630
In use as reference for calib. trending: 0808XX 080630
In use for making calibrations: 0808XX 080727

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