Speaker
Description
Microchannel plate photomultiplier tubes working in photon-counting
mode to detect extremely low number of photons see adoption at the
future large liquid-based neutrino detectors. By coating materials of
high secondary electron yield by the atomic layer deposition at the
end face of the microchannel plates, collection efficiencies of
photo-electrons are pushed to 100%. That, however, introduces a
single electron charge spectra departing from the Gaussian
distribution. Based on laboratory measurements, we present the
mechanism of electron amplification at the end face and formulate a
probabilistic model of the single electron charge spectra. Our
simplified model with Gamma-Tweedie mixture is straightforwardly
deployed in future neutrino experiments under commissioning.
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