June 22, 2020 to July 2, 2020
US/Central timezone

Large photocathode 20-inch PMT testing at the scanning station for the JUNO experiment

Not scheduled


Mr Ilia Butorov (JINR)


The 20kt Liquid Scintillator (LS) JUNO detector is being constructed by the International Collaboration in China. The primary goal of JUNO is the neutrino mass ordering determination. The main challenge for JUNO is to achieve an unprecedented energy resolution, ~3% at 1 MeV of energy released in the LS. About 20000 large 20'' PMTs with high Photon Detection Efficiency (PDE) will cover the detector surface. High demands on the energy resolution place distinct requirements to PMTs properties, namely high uniformity of PDE and gain along the photocathode surface. A dedicated scanning system was constructed for PMTs tests that allows us to study the variation of the abovementioned characteristics. It allows for the testing of individual PMTs in all relevant aspects by means of scanning the photocathode and identifying any potential problems. The scanning setup, method and results of PMTs performance tests are reported.


Scanning of JUNO 20'' PMT studies PDE uniformity, MF sensitivity, cross-check with mass-testing.

Experiment/Collaboration JUNO

Primary authors


Albert Sotnikov (JINR) Alexander Olchevski (FNAL) Alexandr Selyunin (JINR) Alexey Chetverikov (JINR) Arseniy Rybnikov (JINR) Denis Korablev (JINR) Dmitry Fedoseev (JINR) Hang Hu (Sun Yat-sen University) Dr Rong Zhao (Sun Yet-Sen University) Sergey Sokolov (JINR) Vladislav Sharov (JINR) Prof. Wei Wang (Sun Yat-Sen University) Zhimin Wang (IHEP)

Presentation materials