MINOS Document 2055-v1

Preliminary Measurement Of Neutrino Oscillation Parameters By NuMI/MINOS And Calibration Studies For Improving This Measurement

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Phil Symes
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Phil Symes
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28 Jun 2006, 11:40
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28 Jun 2006, 11:40
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28 Jun 2006, 11:40
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This thesis explains the origins of neutrinos and their interactions, and the phenomenon of neutrino
oscillations. Experiments for measuring neutrino oscillations are mentioned and the experiment
investigated in this thesis, the “Main Injector Neutrino Oscillation Search”, and its neutrino beam,
the Fermi National Accelerator Laboratory’s “Neutrinos At The Main Injector”, are described.
MINOS is a long baseline (735 km) neutrino oscillation experiment with a near and a far detector,
intended to make precision measurements of the atmospheric sector neutrino oscillation parameters.
Ameasurement ismade of the “atmospheric” neutrino oscillation parameters, delta m-sq(23) and sin-sq(2*theta(23)),
using neutrinos from the NuMI beam. The results of this analysis are compared to measurements
at MINOS using neutrinos from the atmosphere and with other experiments.
A more detailed method of beam neutrino analysis is discussed, and the extra calibrations needed
to perform that analysis properly are described, with special attention paid to two aspects of the
calibration, which comprise the bulk of work for this thesis.
The light injection calibration system uses LEDs to illuminate the detector readout and provides a
normalisation of the stability of the detector over time. The hardware and different modi operandi
of the system are described. There is a description of installation and commissioning of the system
at one of the MINOS detectors.
The response normalisation of each detector with cosmic ray muons is described. Special attention
is paid to the explanation of necessary corrections that must be made to the muon sample in order
for the sample to be used to calibrate each detector to the specified accuracy. The performance of
the calibration is shown.
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This is the final, published version of my thesis
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