The on-orbit asymmetry calibration is based on 1.5 months of nomSciOps data collected by August 14, 2008 ( ~ 500runs: 236249505 - 240374588).
The calibGenCAL executable genGCRCalib.exe used both gcr and digi root files. Only events and hits selected by GCRCalib are used. Addition selection cuts were applied:
- ThkrNumTracks == 1
- tracker track quality cut (Tkr1Chisq)
- xtal energy depositions between 200 MeV and 900 MeV
Individual pedestal files were used for each run, these pedestal files were generated by the same executable.
To validate the asymmetry calibration obtained by the above procedure the deviation between longitudinal position measured by crystal asymmetry and extrapolated from tracker was plotted separately for each CAL layer and big and small diodes (LEX1 and HEX8 ranges).
The resulting validation histograms for layers 0,1,3 and 7 are shown on following plots: