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T: Fachverband Teilchenphysik

T 84: Search for Dark Matter IV

T 84.10: Talk

Thursday, April 3, 2025, 18:30–18:45, VG 4.102

Simulation and Prototyping of the MainzTPC2 — •Peter Gyorgy, Alexander Deisting, Christopher Hils, Kaveh Kooshkjalali, Uwe Oberlack, and Constantin Szyszka — Johannes Gutenberg-Universität Mainz, Institut für Physik & Exzellenzcluster PRISMA+

The MainzTPC, a small-scale dual-phase xenon time projection chamber, is being redesigned. This upgrade includes the replacement of the top photomultiplier tube (PMT) with a silicon photomultiplier (SiPM) array to gain significantly improved spatial resolution in event reconstruction.

The goal is to achieve a deeper understanding of xenon scintillation and ionization yields at low energies, and to attempt to observe the elusive Migdal effect --- a hybrid nuclear- electron- recoil signal that could prove key to extend to lower dark matter masses the sensitivity of large dual-phase time projection chambers, such as XENONnT or XLZD.

The prototyping process requires extensive modeling and simulations in GEANT4, exploring various design configurations. It must consider optical physics, neutron and gamma scattering, and long-term radioactive exposure. This presentation will summarize results from this simulation process.

Keywords: MainzTPC2; dual-phase xenon TPC; Migdal effect