Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 107: Combined instrumentation session I: Gaseous detectors (joint session HK/T)

T 107.2: Talk

Friday, April 3, 2020, 11:15–11:30, J-HS C

Studies on a structured cathode to increase the detection efficiency of gaseous detectors — •Katrin Penski, Otmar Biebel, Bernhard Flierl, Maximilian Herrmann, Ralf Hertenberger, Christoph Jagfeld, Felix Klitzner, Maximilian Rinnagel, Sebastian Trost, Chrysostomos Valderanis, and Fabian Vogel — LMU München

Micropattern gaseous detectors show extremely good spatial resolution and high-rate capability. Nevertheless, due to the low density of the gas detector they exhibit only low detection efficiency for neutral particles such as e.g. high energy photons or neutrons. For these particles the detection efficiency can be increased by using a solid converter cathode e.g. of high-Z materials as gold for photons or materials with a large neutron interaction cross section e.g. ¹⁰B for neutrons. In order to obtain even higher efficiencies several tilted converter layers can be stacked with large overlap. For photons several studies were performed to optimize the detection efficiency in regard to cathode geometry and detector performance. Especially, measurements of the drift electron movement and investigations of the improvement of the efficiency are presented and compared to results of corresponding simulations. These measurements were performed using a prototype cathode and a GEM detector.