Speaker
Description
This study presents a comprehensive effort to understand the timing and charge sharing in MCP PMTs. While we have investigated in detail - through on-the-bench tests and by modeling the response - the Large Area Picosecond Photodetectors (LAPPD) of Generation II, developed by Incom Inc., we have also compared our model predictions with our past studies of Burle/Photonis and Photek MCP PMTs.
The investigation centered on the effects of capacitive coupling between the monolithic resistive ground-plane anode and the external readout pads in the LAPPD, particularly examining how signal spread and timing performance depend on geometrical factors and pad segmentation. Using a pulsed diode laser system, spatial and timing characteristics were probed with fine granularity. Measurements confirm that signal distribution is dominantly governed by induced charge spread rather than electron diffusion, with signal confinement significantly affected by pad size and MCP-to-anode and anode-to-pad distances. A model was used to understand the observed signal spread and to find optimal system parameters.
Time resolution analyses show a primary timing peak (σ ≈ 27 ps) and secondary structures consistent with back-scattering effects, with resolution improving with increased photocathode-to-MCP potential, all in agreement with a simple model. The study also evaluates integration with two readout systems: PETSYS TOFPET2 ASIC, which showed effective photon detection and spatial clustering, and FastIC ASIC, which delivered excellent timing precision with low-power consumption and integrated TDC/ADC features.
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