Speaker
Description
Microchannel plate photomultiplier tubes (MCP-PMTs) working in
photon-counting mode are critical for extremely low-light detection in
next-generation liquid-based neutrino experiments. Recent advancements
utilizing atomic layer deposition at the MCP end-face have pushed
photoelectron collection efficiencies to nearly 100%. However, this
introduces a complex, non-Gaussian single-electron charge spectrum
that complicates precise energy reconstruction.
Building upon our previously formulated probabilistic model of
end-face electron amplification, we present the comprehensive
validation of a simplified Gamma-Tweedie mixture model. This framework
has now been successfully verified against experimental prototype data
(JNE) and large-scale liquid scintillator detector environments. We
demonstrate that the Gamma-Tweedie scheme accurately captures the
non-Gaussian tails of the charge distribution while maintaining high
computational efficiency. The validated model provides a robust
instrumentation and algorithmic foundation, which is straightforwardly
deployable for precise vertex and energy calibration in upcoming
macroscopic neutrino oscillation measurements.