Speaker
Description
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator experiment in Jiangmen (China). Its main scientific goal is to determine the neutrino mass ordering by measuring electron antineutrinos. To achieve this goal the liquid scintillator had to go through several purification plants on site to ensure it meets the optical and radiopurity requirements.
The 20m³ OSIRIS pre-detector is a monitoring device in line with the purification plants close to the JUNO main detector. In this position OSIRIS was able to monitor the radiopurity of the purified scintillator by measuring the scintillation signals of the the fast BiPo coincidence signals in the Th/U chain with 64 PMTs. OSIRIS was operated in batch-mode to qualify the purity of scintillator samples and its own experimental sensitivity and was used to crosscheck the radio purity and radon levels introduced by the different purification plants.
This poster will cover the mechanical structure, sensor and calibration systems as well as operation modes of the OSIRIS detector.