Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 11: Gaseous Detectors

T 11.2: Vortrag

Montag, 21. März 2022, 16:30–16:45, T-H24

Characterisation of a neutron source using MICROMEGAS detectors — •Stefanie Götz, Otmar Biebel, Vitalii Havrylenko, Ralf Hertenberger, Christoph Jagfeld, Katrin Penski, Maximilian Rinnagel, Chrysostomos Valderanis, and Fabian Vogel — LMU München

MICRO MEsh GAseous Structure detectors (Micromegas) are high-rate capable micro-structured gaseous detectors with high spatial resolution due to small-scale readout strip pitch. This study uses the Micromegas detector technology to characterise the intensity profile and the interaction probability of the radiation composition of a 10 GBq Am-Be neutron source. The detector response from the neutron source is evaluated for different source positions relatively to the detector. Pieces of plastic and lead for radiation shielding allow differentiating between neutrons and gamma radiation when placed on the detector, thus disentangling the detector response of photons and neutrons. The interaction rate of the MeV neutrons and gammas is determined using random triggers. From the source characteristics, an interaction rate of 12 MHz is expected in a 40× 150 cm² Micromegas detector with 1000 strips which corresponds to 6 accidental hits per trigger. The goal is to resolve the beam profile of the neutron source in both horizontal and lateral direction.