SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 30: Nuclear Astrophysics III
HK 30.5: Vortrag
Mittwoch, 22. März 2023, 15:15–15:30, SCH/A419
Linearity and dark rate of SiPMs for large scintillator bars — •Thomas Hensel1,2, Daniel Bemmerer2, Konstanze Boretzky3, Igor Gašparić5,3,4, Daniel Stach2, Andreas Wagner2, and Kai Zuber1 — 1Technische Universität Dresden, Institut für Kern- und Teilchenphysik, 01062 Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf (HZDR), 01328 Dresden, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — 4Technische Universität Darmstadt, Fachbereich Physik, Institut für Kernphysik, 64289 Darmstadt, Germany — 5Ruđer Bošković Institute, Zagreb, Croatia
The NeuLAND (New Large-Area Neutron Detector) plastic scintillator based time of flight detector for neutrons is currently under construction at FAIR. NeuLAND will consist of 3,000 2.7 m long bars that are read out by photomultipliers. Here, data from a comprehensive study of an alternative light readout scheme using silicon photomultipliers (SiPM) are presented. For this purpose, a typical NeuLAND bar was instrumented on each end with a prototype of the same geometry as a 1" photomultiplier tube, including four 6×6mm* SiPMs, amplifiers, high voltage supply, and micro-controller. Using fast digitizers, time resolution and saturation tests were carried out at the 35 MeV electron beam from the ELBE superconducting linac with its ps-level time jitter with 1-60 electrons per bunch. It is found that the SiPM-instrumented NeuLAND bar shows ≤ 10% nonlinearity over a range of 10-300 MeV deposited energy. The dark rate due to random coincident triggers of SiPMs is lower than the cosmic ray induced rate in the NeuLAND bar.