Abstract
Energy resolution is the key of the reactor antineutrino spectrum measurement, for the determination of the neutrino mass hierarchy. The control of the systematics of the energy response is a challenge to the large liquid scintillator experiment such as JUNO. A small-PMT system was proposed to work with the large-PMT system as a double calorimetry. The individual 3-inch PMT receives mostly single photoelectrons, which provides a unique way to calibrate the energy response of the 20-inch PMT system by a photon-counting technology. JUNO has signed a contract with the HZC Company in May 2017 and is going to install 25,000 3-inch PMTs in the central detector. The performances of HZC’s PMT samples can meet the requirements of JUNO. The mass production and testing of PMTs are in preparation, and the R&D of the readout electronics and the underwater box is ongoing. The double calorimetry system was approved by JUNO. The system is under construction and is expected to be in operation in 2020.
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