Bonn 2020 – wissenschaftliches Programm
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HK 51.30: Poster
Donnerstag, 2. April 2020, 16:30–18:30, Zelt
Geometry Optimization of a Scintillation Detector for Detection of Cosmic Air Showers — •Sven Peter, Hans-Georg Zaunick, Markus Moritz, Lukas Nies, Marvin Peter, and Kai-Thomas Brinkmann — II. Physikalisches Institut, JLU Gießen
The geometry of a plastic scintillator for the detection of air showers was optimized using a Geant4 simulation with explicit treatment of optical photons. Starting from a rectangular shape of the scintillator, the corners were cut-off at various angles relative to the short sides of the rectangle. A SiPM at one of the short sides of the rectangle was used as a read-out. A teflon wrapping was simulated using the GODDeSS extension for Geant4. To study the spatially resolved efficiency, minimum ionizing muons that traverse the scintillator at various positions were simulated.
For certain configurations of the cut-off angles, the effect of the reduced scintillator area was overcompensated by the increased light yield due to a focusing effect. A muon detection efficiency of 84% was reached. The spatial homogeneity of the detection efficiency was improved as well. The well-known positive effect of silicone oil as optical coupling between scintillator and the SiPM could be quantified. It doubles the number of detected photons. Furthermore, the light collections efficiency with roughened surfaces was found to be 10 to 15% lower than the efficiency of a perfectly polished one.