Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 69: Neutrino physics without accelerators VI

T 69.8: Talk

Wednesday, March 17, 2021, 17:50–18:05, Ts

Timing Calibration of the OSIRIS detector — •Tobias Sterr, Lukas Bieger, David Blum, Marc Breisch, Jessica Eck, Tobias Heinz, Benedict Kaiser, Frieder Kohler, Tobias Lachenmaier, Axel Müller, Alexandert Tietzsch, and Jan Züfle — Eberhard Karls Universität Tübingen, Physikalisches Institut

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20kt liquid scintillator (LS) detector currently under construction near Kaiping in southern China. Since this detector will feature an energy resolution of 3% @ 1MeV, the radiopurity of the liquid scintillator is of high importance. For monitoring the very low background rate introduced by radio impurities of the LS filling, the OSIRIS (Online Scintillator Internal Radioactivity Investigation System) pre-detector is introduced. To enable OSIRIS to measure impurities of up to 10-16g/g of Uranium and Thorium, a good event reconstruction and control of external backgrounds is important. Therefore, a precise calibration of the timing of the PMT array of OSIRIS is necessary. This talk will present an overview on the concept, the hardware and accompanying simulations of the timing calibration system of OSIRIS, which is based on 24 diffused light injection points driven by a pico-second pulsed Laser. This work is supported by the DFG (Deutsche Forschungsgemeinschaft).