20.500.12556/DKUM-97894 Characterization of the LAPPD, a large area microchannel-plate PMT We present a comprehensive characterization of the LAPPD Gen-II, a large-area microchannel-plate photomultiplier tube (MCP-PMT) equipped with a capacitively coupled sensing (readout) electrode. Two detector variants with different geometries and materials were investigated using a picosecond pulsed laser system. We measured the single-photon timing response and spatial charge distribution on segmented readout electrodes. The prompt timing peak exhibits a resolution of approximately 30 ps, with the overall timing structure explained by photoelectron propagation and back-scattering effects from the MCP input surface. We developed analytical models that describe the propagation of photoelectrons and the induced charge spread on the sensing electrodes, including secondary electron backscattering from the resistive anode. The model accurately reproduces the measured device properties and enables performance extrapolations for various detector geometries and dielectric properties. These results provide a predictive framework for optimizing MCP-PMTs for timing- and imaging-critical applications such as RICH detectors in high-energy physics and TOF-PET systems for medical imaging. Micro-channel plate PMT LAPPD Timing distribution Charge distribution MCP-PMT response modeling RICH TOF-PET detektor svetlobe fotoni fotoelektroni analitični modeli true false true Elsevier Angleški jezik Slovenski jezik https://www.sciencedirect.com/journal/nuclear-instruments-and-methods-in-physics-research-section-a-accelerators-spectrometers-detectors-and-associated-equipment Članek v reviji 2026-04-23 03:11:11 2026-04-23 07:59:23 2026-04-24 03:16:12 0000-00-00 00:00:00 2026 0 0 13 str. Vol. 1088, [article no.] 171466 Aug. 2026 0000-00-00 Zaloznikova Objavljeno apc 2025-12-02 2026-03-10 2026-03-23 539.1 276056323 10.1016/j.nima.2026.171466 1872-9576 1-s2.0-S0168900226001920-main.pdf 1-s2.0-S0168900226001920-main.pdf 1 57D4F63D304CC8A299D1F08F881CE2E5 219b2919bd14c9f7737267bc3f15410799d607eb7fe94685ea9a534f48cc0fba 8c27f933-3ed9-11f1-a8d8-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=205568 https://www.sciencedirect.com/science/article/pii/S0168900226001920?via%3Dihub 1 51994a65-3eb1-11f1-a8d8-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=205565 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0