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Afterpulse measurement of JUNO 20-inch PMTs
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abstract
In this article we present the large photo-multiplier tube (PMT) afterpulse measurement results of Jiangmen Underground Neutrino Observatory (JUNO) experiment. Totally 11 dynode-PMTs (R12860) from Hamamatsu company and 150 micro-channel plate PMTs (MCP-PMTs, GDB-6201) from NNVT company were tested, an afterpulse model is built according to the afterpulse time distribution and probability of occurrence for these two types of PMTs. The average ratio between the total afterpulse charge with the delay between 0.5 $\mu$ s and 20 $\mu$ s to the primary pulse charge is 5.6%(13.2%) for the tested MCP-PMTs (dynode-PMTs). JUNO experiment will deploy 20,012 20-inch PMTs, and this study will benefit the detector simulation, event reconstruction and data analysis of JUNO experiment.
Forward citations
Cited by 2 Pith papers
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Long-Delayed Afterpulse Measurement of JUNO 20-inch Photomultiplier Tubes
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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Dark Count Rate Stability of JUNO 20-inch PMTs in Mass Testing
JUNO's two PMT types differ strongly in dark count rate stability: NNVT MCP-PMTs need about 50 hours to cool and shift 4-12% per degree Celsius with temperature, while HPK dynode PMTs stabilize faster and shift only a...
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