Speaker
Description
Jiangmen Underground Neutrino Observatory (JUNO) is a 20-kiloton liquid scintillator detector currently under construction in Jiangmen, China. Situated 52.5 km from two nuclear power plants within a newly established 700-meter-deep underground laboratory, JUNO aims to determine the neutrino mass ordering by precisely measuring the energy spectrum of reactor neutrinos. Achieving this goal requires an energy resolution better than 3% at 1 MeV, along with an absolute energy scale uncertainty of less than 1% across the entire reactor antineutrino energy range. To meet these stringent requirements, the central detector (CD) will be equipped with 17,612 20-inch and 25,600 3-inch photomultiplier tubes (PMTs), achieving a total photocathode coverage of 78%. The CD is surrounded by a water Cherenkov detector instrumented with 2,400 20-inch PMTs. The large PMTs are interfaced with high-speed, high-resolution sampling electronics positioned close to the PMTs, while the smaller PMTs are read out using CATIROC ASICs. This presentation will discuss the JUNO photodetector system, highlighting performance results obtained from prototype modules and during the mass production of the final PMTs and readout electronics.
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