Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: Gaseous detectors

T 10.2: Vortrag

Montag, 15. März 2021, 16:15–16:30, Tj

Photon Detection by a Structured Cathode of a Micro-Pattern Gaseous Detector — •Katrin Penski, Otmar Biebel, Maximilian Herrmann, Ralf Hertenberger, Christoph Jagfeld, Felix Klitzner, Maximilian Rinnagel, Chrysostomos Valderanis, and Fabian Vogel — LMU München

Micro-Pattern Gaseous Detectors (MPGDs) are high-rate capable and show an extremely good spatial and temporal resolution. Nevertheless, due to the low density of the gas these detectors exhibit only a poor detection efficiency for electrically neutral particles. For photons the detection efficiency can be increased by using a solid converter cathode which is made of high-Z materials. Even higher efficiencies are obtained by stacking several tilted converter layers with large overlap inside a MPGD. In an interaction process electrons are created which have to be guided to the amplification and readout area for detection which is achieved by a specific designed electric field configuration. The tilted layers in combination with the electric guidance field act as structured cathode. In order to investigate the photon detection efficiency measurements are performed using a prototype structured cathode, a GEM detector and an ²⁴¹Am-source emitting 59.5 keV photons. These results are presented and compared to corresponding simulations regarding the electron guiding efficiency, the electron distribution as well as the photon detection efficiency.