Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 86 of 237
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4.3 The drift calibration
Figure 4.2: A typical cosmic muon as reconstructed by the on-line software at the Far
Detector, in the xy coordinate view. The detector shape is superimposed. Hits on the veto
shield system above the detector are also visible. The figure is taken from .
over time. Particularly, light injection events need to be removed as they heavily bias
the energy deposition. Light injection events are removed using a flag which is set when
the light injection is flashing. At the Far Detector some specific standard cuts, presented
in  and described in section 8.4.2, are applied. Some extra requirements on the high
voltage status, coil current status and criteria to guarantee the stable detector conditions
are required according to [112, 113].
Tracks need to be at least 9 planes long at the Far Detector and 15 planes at the Near
Detector. The number of planes required at the Near Detector has been changed from its
original value in  to be more stringent as a hardware trigger change happened on the
number of planes required to trigger activity acquisition at the end of 2005. The trigger
change caused a difference in the acceptance of cosmic muons between the old and new
As shown in figure 4.3 the number of muons passing the selection is on average constant
at the Near Detector and at the Far Detector. The number of muons selected is a quantity
quite sensitive to detector generated events: noisy channels and light injection events that
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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/m1/86/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.