Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 78 of 237
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4.2 The calibration chain
Pcrr = Praw x D(d, t) x L(d, s, Praw) x S(d, s, t) x A(x, d, s, t). (4.1)
In detail, the corrections are:
* The drift correction D(d, t) takes into account the photomultiplier gains, the electron-
ics and the scintillator ageing and dependence on the temperature. The correction
is evaluated using through-going cosmic muons. A more detailed description of the
drift correction is given in section 4.3.
* The linearity correction L(d, s, Praw) is necessary to account for the photomultiplier
non linearity. This non linearity is ~ 5 - 10% for light level above 100 photo-electrons
[101, 102]. In addition, the Far Detector electronics has a non linear response at a
similar signal size. The Near Detector photomultipliers also show non linearity at
small pulse heights. The light injection system is used to correct all of these effects
by injecting known pulses in a range from a few to hundreds of photo-electrons into
the read out system. By comparing the measured pulse height from the detector
readout to the known pulse height generated by the light injection system, a pulse
height dependent correction factor is evaluated on a strip-by-strip basis. The light
emitted by the LED system and monitored by a PIN diode system is known to be
linear within 1-2% itself . At the Near Detector the non linearity is measured as
a function of the true illumination measurement provided by the PIN diodes. At the
Far Detector, the double-ended readout is used and exploits the attenuation of the
signal along the strip. Both ends of the strip are read out, but the light is injected
at one end at a time. At the far end of the strip, the signal is attenuated enough to
be within the linear readout range. This allows an independent measurement of the
* The strip-to-strip non-uniformity calibration S(s, d, t) is obtained using through-going
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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/m1/78/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.