Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Instrumentation IV

HK 11.4: Vortrag

Montag, 10. März 2025, 17:30–17:45, SR Exp1B Chemie

Dual sided PMT Readout Studies for the DarkMESA Calorimeter — •Lukas Reitz for the MAGIX collaboration — Johannes Gutenberg Universität, Mainz

At the Institute for Nuclear Physics in Mainz, the MESA accelerator will be operational shortly, producing a high-energy beam (150 MeV, 15 mikro Ampere). This beam will be used in the P2 experiment and subsequently absorbed in a beam dump, making the P2 experiment ideally suited for a parasitic dark sector experiment --- DarkMESA.

The goal of this experiment is the detection of Light Dark Matter (LDM), which in simple models couples to the dark photon. This dark photon can potentially be produced in the P2 beam dump through a process analogous to bremsstrahlung and may then decay into a dark matter particle pair. A fraction of these dark matter particles will scatter off electrons or nuclei within the DarkMESA calorimeter, generating detectable Cherenkov light.

The Phase A calorimeter consists of 5x5 PbF2 crystals due to their high density and is surrounded by a hermetic veto system made of two layers of plastic scintillators and a 1 cm thick lead shield. For the Phase B calorimeter, SF6 and BGO are also considered as potential calorimeter materials.

This contribution will focus on the feasibility of reading out a BGO calorimeter from both sides using PMTs. A dual-sided readout would enable time-of-flight measurements, allowing for more precise determination of an Event's location and propagation within the calorimeter while also drastically reducing background noise of the detector.

Keywords: PMT; Dark Matter; Background Noise; Time of Flight