Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 93: Detectors 9 (gas detectors)

T 93.5: Vortrag

Donnerstag, 7. März 2024, 17:00–17:15, Geb. 30.23: 2/17

Efficiency Increase of Photon Detection of Micro-Pattern Gaseous GEM Detectors via Material Optimisation of Strucured Converter Layers — •Nick Schneider, Otmar Biebel, Valerio D’Amico, Stefanie Götz, Ralf Hertenberger, Eshita Kumar, Katrin Penski, Chrysostomos Valderanis, Fabian Vogel, and Roman Lorenz — LMU München

Micro-Pattern Gaseous Detectors (MPGDs) are heavily used for the detection of charged particles with excellent temporal and spatial resolution. Electrically neutral particles like photons 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 desgin multiple converter layers are placed perpendicular to the amplification region. In order to further increase the photon detection efficiency the material and structure of the converter layers need to be optimised to find the balance between creation and extraction rate. For photon conversion copper plated layers are used with relatively thin FR4 or Kapton as carrier material. Different converter layer geometries are tested in order to achieve high photon detection efficiencies. These results are compared to simulations for better understanding of the physical processes. The best performing converter layer type increases the photon detection efficiency by a factor of ≈5 compared to the non-optimised layers.

Keywords: MPGD; GEM; Photon Detection