Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 72 of 237
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3.4 The MINOS Monte Carlo
3.3.3 The calibration detector
The MINOS Calibration Detector was functionally identical to the Near Detector and Far
Detector. The Calibration Detector has been useful to determine the calibration procedure
for the MINOS main detectors. Between 2001-2003 it was exposed to a CERN beam of
mixed composition (e, p, r and p) with momentum 0.2-10 GeV/c: the results are used in
MINOS to fix the absolute energy scale. Description of the detector is available in .
It consisted of 60 planes, with the same geometry as the main MINOS detectors. The
Calibration Detector was not magnetised and the thickness of the steel was 2.50 cm. To
mimic the main detector readout conditions, one side was read out by the same readout
chain as the Far Detector, while the other end was read out in the same way as the Near
Detector. The description of the results of the comparison between the two read out systems
can be found in . As the difference between the two detector readouts are fully simulated
in the MINOS MC, the impact of the differences is reduced.
The resolution of the hadronic shower has been determined to be 56%/ /E(GeV) ( 2%.
Figure 3.10 shows the energy resolution for different particles as a function of the particle
energy E. A part of the absolute shower energy systematic error in MINOS accounts for
the residual differences from the Calibration Detector MC and the test beam data.
3.4 The MINOS Monte Carlo
The NuMI beamline is simulated using the FLUKA  simulation package to predict the
hadron production from the target and in the decay pipe. The full beamline geometry is
simulated using the Flugg package  which handles the GEANT4 geometry in FLUKA.
Run I (May 2005 - February 2006), Run II (September 2006 - July 2007) and Run III
(November 2007 - June 2009) are simulated each with the appropriate target position.
Helium in the decay pipe is simulated for Run III as well. Documentation on the latest
NuMI beam simulation is available in .
The neutrino fluxes are predicted by the beamline simulation and they are used as an
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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/m1/72/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.