| Title: | Characterization of the LAPPD, a large area microchannel-plate PMT |
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| Authors: | ID Korpar, Samo (Author), et al. |
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| Files: |  1-s2.0-S0168900226001920-main.pdf (4,29 MB)
MD5: 57D4F63D304CC8A299D1F08F881CE2E5
 https://www.sciencedirect.com/science/article/pii/S0168900226001920?via%3Dihub
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | 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. |
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| Keywords: | Micro-channel plate PMT, LAPPD, Timing distribution, Charge distribution, MCP-PMT response modeling, RICH, TOF-PET |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 02.12.2025 |
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| Article acceptance date: | 10.03.2026 |
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| Publication date: | 23.03.2026 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2026 |
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| Number of pages: | 13 str. |
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| Numbering: | Vol. 1088, [article no.] 171466 |
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| PID: | 20.500.12556/DKUM-97894  |
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| UDC: | 539.1 |
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| ISSN on article: | 1872-9576 |
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| COBISS.SI-ID: | 276056323 |
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| DOI: | 10.1016/j.nima.2026.171466 |
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| Publication date in DKUM: | 23.04.2026 |
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| Views: | 152 |
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| Downloads: | 14 |
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| Metadata: |    |
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| Categories: | Misc.
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