Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation X

HK 44.1: Talk

Thursday, March 13, 2025, 14:00–14:15, SR Exp1B Chemie

The MAGIX Trigger Veto System — •Hannah Keßler for the MAGIX collaboration — Institute for Nuclear Physics, Johannes Gutenberg University Mainz, Germany

The MAGIX experiment, located at the new MESA accelerator at the University of Mainz, is designed for high-precision electron scattering studies. Its scientific goals include exploring dark sector particles, investigating the structure of hadrons and few-body systems, and studying reactions relevant to nuclear astrophysics. The experimental setup features a windowless scattering chamber with an internal gas jet target, two rotatable magnetic spectrometers, and advanced detector systems at their focal planes. A central component of these detectors is the MAGIX Trigger Veto System, which comprises plastic scintillators and passive lead absorbers. The veto part of the system is essential for particle identification and the trigger layer provides accurate timing information to support the tracking detector, a time projection chamber. To enhance the veto system's performance, various readout approaches have been investigated, including the use of readout cards and individual silicon photomultipliers. Laboratory tests with a Cobalt-60 source provided valuable insights into the signal processing capabilities. Further evaluations during a beam time at the Mainz Microtron (MAMI) allowed for a detailed comparison of the different readout methods under real experimental conditions.

In this presentation, I will introduce the MAGIX Trigger Veto System, outline the readout techniques explored, and share the results of the experimental investigation.

Keywords: electron scattering; magnetic spectrometers; Plastic Scintillator; Gas Jet Target; MAGIX