Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 11: Gaseous Detectors

T 11.5: Vortrag

Montag, 21. März 2022, 17:15–17:30, T-H24

Prototype of a Cherenkov position sensitive Micromegas — •Maximilian Rinnagel, Otmar Biebel, Stefanie Goetz, Christoph Jagfeld, Katrin Penski, Chrysostomos Valderanis, Fabian Vogel, and Ralf Hertenberger — LMU München

etectors utilizing the Cherenkov effect are well established for particle identification of charged particles in detector systems such as LHCb or HADES. In reverse it is possible to determine the momentum of a known particle by measuring the opening angle of the Cherenkov cone in Cherenkov media. Our goal with this 10x10 cm² prototype is a proof of principle using cosmic muons. A traversing muon creates around 1500 Cherenkov photons in our 19 mm thick ultra-violet transparent Lithium Fluoride (LiF) crystal (diameter 50 mm; UV optical refractive index 1.5). The conversion to electrons happens in transmission in a photosensitive CsI layer evaporated onto a 5 nm Cr layer, both applied to the bottom of the radiator. High voltage of -300 V, at the Cr layer, guides the ionization and photoelectrons into the drift region of a Micromegas gaseous micro pattern detector. First results utilizing muon tracks reconstructed from reference detectors will be shown. The typical signal shape of this detector as well as the spatial position reconstruction are compared to the Micromegas detector without the LiF Cherenkov radiator.