Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 48: Neutrino Physics without Accelerators 3
T 48.4: Vortrag
Dienstag, 22. März 2022, 17:00–17:15, T-H33
Calibration of the JUNO pre-detector OSIRIS — •Moritz Cornelius Vollbrecht1,2, Alexandre Göttel1,2, Philipp Kampmann3, Runxuan Liu1,2, Livia Ludhova1,2, Nikhil Mohan1,2, Luca Pelicci1,2, and Mariam Rifai1,2 — 1Forschungszentrum Jülich GmbH, Nuclear Physics Institute IKP-2, Jülich — 2III. Physikalisches Institut B, RWTH Aachen University, Aachen — 3GSI Helmholtzcentre for Heavy Ion Research, Darmstadt
The multi-kton liquid scintillator (LS) detector of the Jiangmen Underground Neutrino Observatory (JUNO) experiment, currently under construction in Southern China, has a vast potential for insights in several fields of (astro-) particle physics. To achieve its goals of determining the neutrino mass ordering, stringent radiopurity levels are required. To ensure these limits, the Online Scintillator Internal Radioactivity Investigation System (OSIRIS) was designed as a predetector for JUNO. In OSIRIS, 76 self-triggering intelligent PMTs (iPMTs) instrument a watershielded 20 ton liquid scintillator target. During the months-long filling of JUNO, a fraction of each purified scintillator batch passes through OSIRIS and its radiopurity is closely monitored. This enables fast countermeasures on possible contaminations. Multiple calibration systems are employed in OSIRIS. An Automatic Calibration Unit (ACU) of the Daya Bay experiment is used to calibrate energy and vertex event reconstructions as well as iPMT timing and charge responses. A separate laser system is used for the timing calibration of the iPMTs. This presentation will summarize the current status of the work concerning the calibration strategy of OSIRIS.