History: Calibration Technique

Currently, detectors in N1 all have offsets relative to detector N1-10. Then detectors in planes N2 - N4 all have offsets calculated relative to the corresponding detector in N1. For example, to get the offset for detector N3-11, the histograms for N3-11 - N2-11, N2-11 - N1-11, and N1-11 - N1-10 would be used. Doing this, all detectors in planes N1 - N4 (excluding the GLA detectors) are aligned with N1-10. Then a histogram is used get the relative offset between N4-10 and N5-14. From there, and by a similar iterative process, all detectors in N5-N7 are aligned with N5-14 and hence with N1-10. A similar process was being done for the GLA detectors, but since detectors in that plane were removed and added on a run by run basis, this was delayed until a database with detector status per run would be created.