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Study on the linearity of 20" dynode and MCP PMTs

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arxiv 2212.11514 v1 pith:DCZEGT4B submitted 2022-12-22 physics.ins-det hep-ex

Diru Wu , Fengjiao Luo , Zhimin Wang , Min Li , Jilei Xu , Miao He , Changgen Yang , Yuekun Heng This is my paper · ORCID
classification physics.ins-dethep-ex
keywords pmtslinearitychargedynodemcp-pmtmeasurementsmethodresponse
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The linearity of charge response is an important feature of photomultiplier tubes (PMT) for physics measurements, especially the newly developed 20" MCP-PMT. In this paper, in addition to the traditional method of double light sources, we applied another relative method of 20" PMT to 3" PMT to measure the linearity of the 20" dynode and MCP PMTs in pulse mode with a waveform digitizer. The measurements show a good linear response of 20" PMTs to 1,000 photoelectrons (p.e.). The correlations of the amplitude, rise-time, fall-time, FWHM, baseline recovery, overshoot, and late-pulse to the output charge of the 20" PMTs derived from the waveform analysis, where the MCP-PMT shows very different features compared to the dynode-PMT in particular.

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  1. Long-Delayed Afterpulse Measurement of JUNO 20-inch Photomultiplier Tubes

    hep-ex 2026-08 conditional novelty 6.0 of 10

    Long-delayed afterpulses peaking near 260 μs (dynode) and 90/550 μs (MCP), at yields of 10^-3 per primary photoelectron, were measured in JUNO 20-inch PMTs out to 20 ms.

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