Setup of a Drift Tube Muon Tracker and Calibration of Muon ...

Appendix ENoise PatternsThis appendix gives a short overview of the most common noise events in the CMT.Noise events do not occur very often and most of them can be effectively suppressedby a simple cut on the number of hits. Fig. E.1 shows an event where all activetubes have fired. The signal widths are all either medium or small. Events with 48hits per module are discarded, so this kind is ignored.A more dangerous effect occurred for a period of a few days during RUN 243 11-23-20 1 . Similar noise patters where most of the outer right tubes showed a signalwould occur approximately one an hour. A typical event is depicted in Fig. E.2.These events cannot be filtered by a cut on the number of events. Also, the hits areall in one column which is likely to mimic a real track. These events can be identifiedagain by the small and medium signal widths. However, a cut on the signal width isnot performed to prevent true hits with non large signal width from being removedfrom the data. With a good calibration, these events are rejected by the fit and aretherefore of no threat.1 This is already indicated by the large number of events despite the short duration of the run.109