- Can GCRcalib help to calibrate ACD HI charge scale? (Fred)
Following the presentation of last week, I analysed 50 runs of opssim2 data. The collection time is 70h (effective duration of 60h).
For each event where GCRCalib found an even value for the atomic number in the range 6-14 (i.e. C, O, Ne, Mg or Si), I loop on the AcdTrkHitPoca list in ACD recon. For those hits which have a suitable DOCA to Tkr1 track (doca>-50mm, i.e. Tkr1 track within 50mm of the tile), I get the number of MIPs from the AcdHit collection. This is a very slow analysis (8h30 to analyse 50 runs!). The following plot in the left panel shows the obtained MIP spectrum, combining all ACD tiles: the red vertical lines are at positions 36 (C), 64 (O), 100 (Ne), 144 (Mg) and 196 (Si).Only the carbon peak is visible. The rate of events above 20 MIPs is 0.06Hz, thus really lower than the ~1Hz of GCRCalib throughput (see right panel). The plot below shows the same spectrum restricted to carbon events.
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