Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Instrumentation V

HK 20.4: Vortrag

Dienstag, 11. März 2025, 16:30–16:45, SR Exp1A Chemie

StarryNight - A calibration system for the time projection chamber at MAGIX — •Daniel Steger for the MAGIX collaboration — Institute for Nuclear Physics, Johannes Gutenberg University Mainz, Germany

The MESA accelerator will host the MAGIX experiment, which is based on the scattering of an electron beam on a gas jet target. This enables scattering on gases like hydrogen while minimizing interaction with any other materials allowing us to perform high precision experiments. The measurement of the scattered particles is performed by two magnetic spectrometers using a GEM based TPC to track the particle trajectories. To achieve the precision desired an independent system to calibrate the TPC is necessary.

Such a system has been designed, utilizing LEDs with a wavelength of 255 nm that are operated in pulses directed at fused silica panes sputtered with aluminium at the cathode of the active volume of the TPC. This produces individual free electrons at known positions and times which drift along the electric field lines of the TPC and thereby allow a precise characterization of the field.

In this contribution the setup of this calibration system will be presented.

Keywords: Gas Detector; TPC; Calibration