Single electron charge spectra of 8-inch high-collection-efficiency MCP-PMTs

Abstract

The atomic layer deposition(ALD) coating lengthens the lifetime of microchannel plates(MCP), which are used as the electron amplifier of the photomultiplier tubes(PMT). In the Jinping Neutrino Experiment, the newly developed 8-inch MCP-PMT achieves high collection efficiency by coating with high secondary emission materials. The resulting single electron response(SER) charge distribution deviates from the Gaussian distribution in large charge regions.To understand the nature of the jumbo-charged SER, we designed a voltage-division experiment to quantify the dependence of the MCP gain on the energy of incident electrons. Combining the relationship with the Furman probabilistic model, we reproduced the SER charge spectra by an additional amplification stage on the input electrode of the first MCP. Our results favor a Gamma-Tweedie mixture to describe the SER charge spectra of the MCP-PMTs.

References in corpus (4)

• Mass Testing and Characterization of 20-inch PMTs for JUNO
• Towards the ultimate PMT waveform analysis for neutrino and dark matter experiments
• Performance of the most recent Microchannel-Plate PMTs for the PANDA DIRC detectors at FAIR
• Performance evaluation of the 8-inch MCP-PMT for Jinping Neutrino Experiment

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