“School of Particles”
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| Paper IPM / Particles / 11490 |
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| Abstract: | |||||||||
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The PMTs of the CMS Hadron Forward calorimeter were found to generate a large
size signal when their windows were traversed by energetic charged particles. This signal, which
is due to Cerenkov light production at the PMT window, could interfere with the calorimeter signal
and mislead the measurements. In order to find a viable solution to this problem, the response of
four different types of PMTs to muons traversing their windows at different orientations is measured
at the H2 beam-line at CERN. Certain kinds of PMTs with thinner windows show significantly
lower response to direct muon incidence. For the four anode PMT, a simple and powerful
algorithm to identify such events and recover the PMT signal using the signals of the quadrants
without window hits is also presented. For the measurement of PMT responses to Cerenkov light,
the Hadron Forward calorimeter signal was mimicked by two different setups in electron beams
and the PMT performances were compared with each other. Superior performance of particular
PMTs was observed.
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