Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 89 of 237
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4.3 The drift calibration
Near Detector Far Detector
0 IX10 3 0 1 . . . . IX103
0.5 I 1.5 2 0.5 1 1.5 2
Track PH per plane (ADC) Track PH per plane (ADC)
Figure 4.4: Distributions of the pulse height per plane deposited by selected cosmic muon
tracks in the Near Detector (left) and in the Far Detector (right).
expression on the error on the median is not available, the error on the mean has been
chosen as the quoted error for the drift constants. Figure 4.4 shows the distributions of the
pulse height per plane (measured in ADC counts) deposited by selected cosmic muon tracks
in the detectors. The ionisation per plane is expected to follow a Landau distribution ,
characterised by a long tail at high ionisation. The median provides a good estimator of the
daily detector response as it is only moderately affected by the Landau tail in comparison
to the mean estimator.
The detector drift and the correction
Every day, when data is available, the median pulse height per plane deposited by cosmic
muons is recorded. This allows us to track the detector drifts over the data taking period.
A particular detector response has been chosen as the reference response Hit, to which
all the median detector response per plane will need to be normalised to. By convention
the chosen reference constant is the median detector response per plane at 00:00:00 on 1"
December 2005. Once the median response per day nit at each day t has been evaluated, the
calibrated pulse height (ph,) for the particular day t is obtained by applying a correction
factor L to the uncalibrated pulse height (phunc):
phc = phuncfltO (4.8)
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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/m1/89/: accessed April 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.