Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 71 of 237
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3.3 The MINOS detectors
Figure 3.9: The arrangement of the scintillator modules on a Far Detector plane. The
outer modules consists of 28 scintillating strips, while the internal modules consists of 20
scintillating strips each. Figure taken from .
reduce the rate of noise events, a "2/36" trigger is used: events are digitised only if at least
2 dynodes in different photomultipliers in the same VARC receive a signal within 400 ns.
A VARC also produces a timestamp for the recorded activity.
Every time there is a spill trigger, the signal is transmitted from the Near Detector over
the Internet and the acquisition of events lasts for 100 ps, with 30 ps before the trigger also
acquired to avoid to truncate events. Out of spill, the Far Detector is read out using other
trigger logic as the rate of noise is too high to digitise continuously. To trigger on cosmic
rays and atmospheric neutrinos, the acquisition is started when 4 contiguous planes out of 5
record some signal or 4 planes record a signal exceeding the threshold of 1500 ADC counts
or 20 planes record activity in the detector. Fake spill triggers are also used to record the
noise which would be in real spill triggers on top of any neutrino signal. The trigger rate
at the Far Detector is 30 Hz.
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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/m1/71/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.