Abstract
The spatial dependence of the timing performance of the R3809U-50 Micro-Channel-Plate PMT (MCP-PMT) by Hamamatsu was studied in high energy muon beams. Particle position information is provided by a GEM tracker telescope, while timing is measured relative to a second MCP-PMT, identical in construction. In the inner part of the circular active area (radius r<5.5 mm) the time resolution of the two MCP-PMTs combined is better than 10 ps. The signal amplitude decreases in the outer region due to less light reaching the photocathode, resulting in a worse time resolution. The observed radial dependence is in quantitative agreement with a dedicated simulation. With this characterization, the suitability of MCP-PMTs as t0 reference detectors has been validated.
Highlights
Reliable reference detectors with high time resolution are needed in the characterization of new detector technologies aiming at performing ultra precise time measurements
The radial dependence of the mean signal charges relative to the center of each Micro-Channel-Plate Photomultiplier Tubes (MCP-PMT) are shown in Figure 3 together with the results from the analytical model with and without reflections and from the Monte-Carlo simulation
The signal charge decreases as expected with increasing distance from the MCP-PMT center due to a decrease of the Cherenkov light reaching the photocathode
Summary
Reliable reference detectors with high time resolution are needed in the characterization of new detector technologies aiming at performing ultra precise time measurements. For the further simulation a generic Cherenkov angle of 45◦ is assumed These MCP-PMTs provide short signals with a rise time of 160 ps. Signals of this kind are well suited as a time reference for fast-timing detector studies. Measurements demonstrated the suitability of MCP-PMTs as a (t0) timing reference for PICOSECMicromegas fast-timing detectors [7]. In this manuscript, we discuss further investigations, aiming at understanding the spatial dependence of the time resolution over the surface of the photocathode. The observed radial dependences of the mean signal charge and time resolution have been compared to the modeled fraction of Cherenkov light reaching the photocathode. The different models as well as the measurement set-up will be explained and the measured data will be compared to the results from the simulation
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