Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 90 of 237
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4.3 The drift calibration
The drift correction factor, as well as the other calibration factors, are applied to each
single hit in the detectors. Then a full reprocessing is needed in order to have completely
calibrated data and Monte Carlo samples.
Figure 4.5 shows the detectors response drift over time. The Far Detector shows a
consistent drop in response of approximately 2% a year. The discontinuity in detector
response in March 2006 is due to a retuning of the voltage across the photomultipliers.
At the Near Detector the detector response was stable for nearly one year before starting
decreasing with time. The period of constant response is consistent with the photomultiplier
gain variation over time and the scintillation light drift compensating, as will be shown in
Spatial dependence of the drift constants
As already explained, the cosmic muon drift calibration technique provides a single constant
for the whole detector. As the detector average drift is used to correct each single part
of the detector, some parts will be under corrected and some other parts will be over
corrected. The strip-to-strip correction S(d, s, t) described in section 4.2.1 is responsible for
normalising the response in different detector parts to the mean detector response at the
Nevertheless, the median pulse height per plane deposited in different parts of the
detectors is evaluated as a cross-check. As both the detectors are divided in two parts,
this naturally offers two nearly independent detector areas on which to cross check the
drift constants. At the Near Detector the detector is divided in the calorimeter and the
spectrometer, while the Far Detector is divided into the two supermodules. The same
technique to evaluate the median pulse height per plane is adopted, but only the planes in
each of the single detector parts are considered each time. Figure 4.6 shows the median
pulse height per plane deposited by muons in the whole Far Detector, compared to the
one deposited in the two independent parts. At the Near Detector the calorimeter is the
part where is important to have good calibration. For this reason it has been chosen to
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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/m1/90/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.