Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 93: Detectors 9 (gas detectors)

T 93.1: Talk

Thursday, March 7, 2024, 16:00–16:15, Geb. 30.23: 2/17

Photon Position Reconstruction using Structured Converter Layers in Micro-Pattern Gaseous Detectors — •Katrin Penski, Otmar Biebel, Valerio D’Amico, Stefanie Götz, Roman Lorenz, Ralf Hertenberger, Eshita Kumar, Nick Schneider, Chrysostomos Valderanis, and Fabian Vogel — LMU München

Micro-Pattern Gaseous Detectors are high-rate capable with excellent spatial and temporal resolution. Developed for the detection of charged particles, the low density in the active gas volume of these detectors exhibit only a poor detection efficiency for electrically neutral particles. For photons the detection via the photoelectric effect can be increased using a solid converter cathode, which is made of high-Z materials. With our novel approach, the detection efficiency can be optimized by incorporating multiple converter plates quasi perpendicularly on top of the first GEM foil. Moreover, this technique aims to provide a full two-dimensional position reconstruction of the particle with a resolution of less than 100 µm within a converter plate. Using the two coordinates of the readout anode of the GEM detector enables this by mounting the converter layers at a specific angle that allows geometric position reconstruction. An optimized electric field, where the electric field lines are parallel to the amplification field, guides the electrons from the converter layers to the GEM foils. Simulations were performed to optimize the design and understand the underlying physical processes. These and measurement results are presented, which aim to image an object in order to verify the functionality of this method.

Keywords: Micro-Pattern Gaseous Detectors; Photon Detection