Description
A 20 kton liquid scintillator (LS) detector was designed in the Jiangmen Underground Neutrino Observatory (JUNO) for multiple physical purpose. The JUNO experiment will install 25k 3-inch PMTs (SPMTs) in the gaps between 18k closely packed 20-inch PMTs (LPMTs). The SPMTs will almost work in single photoelectron mode for the reactor antineutrino detection. This feature is helpful to constrain some of the systematics in the LPMT energy reconstruction and improve the energy resolution. Moreover, SPMTs have the potential to improve the measurements of the solar parameters (θ12 and ∆m_21^2) and supernova neutrinos, etc. All 25k bare 3-inch PMTs have been produced and tested in China. To adapt the detector to work underwater, we apply an integration of SPMTs with HV dividers, frontend cable and connector with water proofing. As a result, every 16 PMT is combined into a group that shares the same high voltage through a multi-channel connector. After potting, all SPMTs will be tested again before delivering to JUNO site. Until now, about 15k SPMTs were measured and they show good performances after potting. In this poster, details of instrumentation and acceptance test of SPMTs will be presented.
| Collaboration | JUNO |
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