Report/Dissertation / PhD Thesis PUBDB-2015-05197

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Timing Calibration of the Trigger System for the Drift Tube Detector of the OPERA Neutrino Oscillation Experiment



2015
Verlag Deutsches Elektronen-Synchrotron Hamburg

Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 160 pp. () [10.3204/DESY-THESIS-2015-048] = Universität Hamburg, Diss., 2015  GO

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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.


Note: Universität Hamburg, Diss., 2015

Contributing Institute(s):
  1. Uni Hamburg / Experimentalphysik (UNI/EXP)
Research Program(s):
  1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)
Experiment(s):
  1. CNGS: OPERA

Appears in the scientific report 2015
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 Record created 2015-11-29, last modified 2021-11-10


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