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T: Fachverband Teilchenphysik
T 116: Detectors 11 (gas detectors)
T 116.2: Vortrag
Freitag, 8. März 2024, 09:15–09:30, Geb. 30.23: 2/17
Cosmic Muon Tracking with Micromegas Detectors and Neutron Source Characterisation — •Eshita Kumar, Otmar Biebel, Valerio D’Amico, Stefanie Götz, Ralf Hertenberger, Roman Lorenz, Katrin Penski, Nick Schneider, Chrysostomos Valderanis, and Fabian Vogel — LMU München
MICRO MEsh GAseous Structure (Micromegas) detectors are Micro-Pattern Gaseous Detectors (MPGDs) that have high rate capability due to the fast evacuation of positive ions and excellent spatial resolution due to a small-scale readout strip pitch. To test the performance and resilience of such detectors in detecting cosmic muons under high background, a 2 m2 Micromegas detector with four layers was irradiated by a 10 GBq Americium-Beryllium neutron source for a period of three years. The analysis performed on these measurements without background radiation and the final results obtained on the efficiency of the detectors in tracking cosmic muons after long-term irradiation will be discussed. Furthermore, an intensive study on the characteristics of the neutron source used was carried out: measurements with a shielding material of varying thicknesses placed in front of the source were used to disentangle the detector response for gamma and neutron radiation. A Germanium detector was used in order to determine the intensity of gammas produced by the source. Following this, a Geant4 simulation was performed to determine the interaction probability from the background radiation. A comparison of the analysis of the detector output to the simulation results for the final charge obtained from the gammas and the neutrons will be shown.
Keywords: MPGDs; Micromegas; Muon detectors; Germanium Detectors; Geant4 simulation