Erlangen 2026 – wissenschaftliches Programm
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ST: Fachverband Strahlen- und Medizinphysik
ST 2: Detectors for Treatment Monitoring
ST 2.3: Vortrag
Dienstag, 17. März 2026, 16:45–17:00, KH 01.013
Measurement and Geant4 simulation of Cherenkov radiation with an electron monochromator — •Atharva Bahekar, Yazeed Balasmeh, Ivor Fleck, Mara Fries, Lars Maczey, and Devanshi Mehta — Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen
High-energy electron detection techniques require monoenergetic electrons for detector response validation and optical simulations. This work characterizes a custom-built magnetic electron monochromator developed in the Compton Camera group at Universität Siegen, benchmarked by a detailed Geant4 simulation.
Electrons from a 90Sr /90Y source are propagated into a fixed magnetic field and a collimator. A motorized linear and rotational stage positions the source for precise selection of electron energies. These selected electrons are then detected by a calibrated system of a (Gd3Al2Ga3O12:Ce : Ce) (GAGG) scintillation crystal coupled to a photomultiplier tube (PMT). A corresponding Geant4 setup reproduces the source, magnetic optics and detector geometry. A direct comparison of the mean energies of simulated electrons to the experimentally obtained mean electron energies for various source configurations provides a quantitative validation of the Geant4 setup, subject to agreement between simulation and measurement.
This validated framework will be used to measure Cherenkov photon production in a PMMA radiator for fixed electron energies. This will provide credible data for neural network-based image reconstruction algorithms in our Compton Camera project.
Keywords: Compton camera; Medical imaging; Cherenkov light detection; Geant4 simulation; Electron monochromator