Regensburg 2025 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 5: Instrumentation, Microscopy and Tomography with X-ray Photons, Electrons, Ions and Positrons

KFM 5.7: Vortrag

Montag, 17. März 2025, 16:45–17:00, H9

TwinPALS: A digital Twin for laboratory-based Positron Annihilation Lifetime Spectroscopy — •Dominik Boras, Danny Petschke, and Torsten Staab — LCTM / IFB, Department of Chemistry, University of Wuerzburg, Roentgenring 11, D-97070 Wuerzburg, Germany

In this work, we present a comprehensive digital twin of a laboratory-based Positron Annihilation Lifetime Spectroscopy (PALS) system. This digital twin is capable of simulating entire spectra while incorporating all effects of the hardware used in the PALS system, as well as varying source strengths. For the first time, it is possible to visualize unwanted components within the lifetime spectrum and assess their impact on the interpretability of these spectra. The digital twin enables the identification of issues within one's own setup and allows for digital testing of potential optimizations before physical implementation. Additionally, this approach facilitates the validation of software-based physical filters and provides a unique opportunity to visualize their effects on unwanted components in the spectra. The digital twin represents a comprehensive simulation framework that allows for a multitude of hardware investigations in the digital realm, effectively functioning as a digital mirror of the complete hardware setup. This enables researchers to conduct extensive, risk free experiments and optimize system configurations, ultimately improving the quality and reliability of PALS data.

Keywords: Digital Twin; Positron Annihilation; Lifetime Spectroscopy; Scintillator; Photomultiplier