SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Gas-Detectors

T 76.1: Talk

Wednesday, March 22, 2023, 15:50–16:05, WIL/C207

Material Optimization for Photon Detection by Structured Converter Layers using Micro-Pattern Gaseous GEM Detectors — •Nick Schneider, Otmar Biebel, Valerio D'Amico, Florian Egli, Stefanie Götz, Ralf Hertenberger, Christoph Jagfeld, Eshita Kumar, Katrin Penski, Maximilian Rinnagel, Chrysostomos Valderanis, and Fabian Vogel — LMU München

Micro-Pattern Gaseous Detectors are heavily used for the detection of charged particles with excellent temporal and spatial resolution. Electrically neutral particles are detected with poor efficiency due to the low density in the active gas volume. By inserting solid converter layers of high-Z material this disadvantage can be mitigated. In our design multiple converter layers are placed perpendicular to the first GEM foil. Proper electric fields guide the electrons to the amplification region. In order to further increase the photon detection efficiency the material and structure of the converter layers need to be optimized to find the perfect balance between creation and extraction rate. For photon conversion copper plated layers are used with relatively thin FR4 as carrier material. Different thick combinations of FR4 and copper are tested in order to achieve high photon detection efficiencies. These results are compared to simulations for better understanding of the physical processes. This method increases the photon detection efficiency by a factor of about 2 and provides interdisciplinary possibilities in material research, medical physics or astrophysics.