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| Home > Publications database > Timing Calibration of the Trigger System for the Drift Tube Detector of the OPERA Neutrino Oscillation Experiment |
| Report/Dissertation / PhD Thesis | PUBDB-2015-05197 |
2015
Verlag Deutsches Elektronen-Synchrotron
Hamburg
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Please use a persistent id in citations: doi:10.3204/DESY-THESIS-2015-048
Report No.: DESY-THESIS-2015-048
Abstract: The OPERA experiment searches for muon neutrino to tau neutrino oscillations in an almost pure muon neutrino beam. The goal is to observe the oscillations in appearance mode by using a large-scale lead/emulsion target to resolve individual tau neutrino interactions. Magnetic spectrometers measure the charge and momentum of beam induced muons leaving the target sections. The Precision Tracker, a drift tube detector consisting of almost 10000 drift tubes, provides the tracking information inside the spectrometers. The coordinate measurement in the drift tubes is derived from a time measurement relative to an external trigger signal. In order to reach the required momentum resolution of less than 25 % for particle momenta up to 25 GeV, the uncertainty on the trigger timing must not exceed a value of 5 ns. In this thesis, a procedure for the timing calibration of the trigger system is presented. A step-by-step calibration of the corresponding signal paths is described. Applying all calibration results, a spatial resolution of 255 µm is achieved for the Precision Tracker, meeting the specified requirements. Furthermore, a method using the calibrated trigger system for performing time of flight measurements with atmospheric muons is developed. The average error on the measured flight times is +-4.5 ns.
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