Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 82 of 237
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4.3 The drift calibration
4.3 The drift calibration
A good part of the work in this thesis has been devoted to improving the drift correction
D(d, t) in the calibration chain presented above. The original technique has been developed
in  but it has been further studied here to make it more robust to bad detector condi-
tions, change in trigger and differences in tracking efficiencies in more recent reconstruction
versions. A complete consistent dataset of drift constants has been provided from Run I to
Run III for the present reconstruction version. A fully automated production of daily drift
constants has been developed and has been producing constants starting from Run IV on.
Furthermore, the detector ageing and dependence on the temperature have been studied.
The detector response studied in the drift correction is a combination of the scintillator
light output, the photomultiplier gains and the electronic readout. Any change in any of
these three components correspond to a change in the detector response. The electronics is
known to be fairly stable (studied in  at the Far Detector) but it is affected by hard-
ware swaps. When a hardware swap is made, the electronics is recalibrated to minimally
change the overall detector response. The change is also only local and does not affect
the overall detector. The scintillator light output was studied by dedicated ageing tests
. Based on these tests, the non-reversible ageing due to yellowing of the scintillator
and the attenuation of the wavelength-shifting fibres is expected to be 1.2% per year at
20'C. A reversible loss in light output due to temperature effects has been quantified as
0.3% per 'C. The degradation of the wavelength-shifting fibre output is accelerated by the
increase in temperature as well. From the photomultiplier gain measurement provided by
the LI system, the long term variation of the gains due to ageing seem to be around 4%
per year. From temperature effect studies, a gain decrease of 0.2% per 10C  for the
Far Detector 16-anode photomultipliers and of 0.55% per 10C (from figure 9 in ) for
the Near Detector 64-anode photomultipliers are expected from dedicated tests.
The overall detector response is affected by the long term trend of scintillator light out-
put, wavelength-shifting fibres, electronics and photomultiplier gains, as well as by short
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Tinti, Gemma Maria & U., /Oxford. Sterile neutrino oscillations in MINOS and hadron production in pC collisions, thesis or dissertation, July 1, 2010; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1015233/m1/82/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.