Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 82: Neutrino Physics VII
T 82.3: Vortrag
Donnerstag, 3. April 2025, 16:45–17:00, VG 3.104
Status of the Laser Calibration of the JUNO pre-detector OSIRIS — •Tobas Sterr1, Dhanushka Bandara1, Lukas Bieger1, Silvia Cengia1, Jessica Eck1, Adrian Keiderling1, Florian Kirsch1, Tobias Lachenmaier1, Anurag Sharma1, and Rosmarie Wirth2 — 1Eberhard Karls Universität Tübingen, Physikalisches Institut — 2Universität Hamburg
The 20 kt liquid scintillator (LS) detector of the Jiangmen Underground Neutrino Observatory (JUNO) experiment, currently under construction in southern China. To achieve its physics goals, stringent radiopurity requirements for the LS must be fulfilled. In order to ensure these limits, the Online Scintillator Internal Radioactivity Investigation System (OSIRIS) was designed as a pre-detector for JUNO. During the months-long filling period of JUNO, OSIRIS will assess the radiopurity of purified LS batches to allow fast countermeasures in case of contaminations. In OSIRIS, an array of 76 Photomultiplier Tubes (PMTs) instruments a water-shielded 18-ton LS target. A pico-second pulsed laser system is used for PMT timing and charge calibration. This presentation will summarize the current status of the laser calibration system, the calibration strategy of this system and first results of the calibration in the commissioning phase of OSIRIS. Furthermore, OSIRIS PMT performance parameters using the laser calibration system are presented and compared to the results of the JUNO PMT testing campaign.
This work is supported by the Deutsche Forschungsgemeinschaft.
Keywords: Kalibration; JUNO; Liquid Scintillator; OSIRIS