Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Instrumentation XIV

HK 59.5: Talk

Thursday, March 13, 2025, 18:30–18:45, SR Exp1B Chemie

The windowless gas jet target for e-p scattering experiments at MAGIX at MESA: Development and optimization — •Liridon Deda, Philipp Brand, Jost Froning, and Alfons Khoukaz for the MAGIX collaboration — Institut für Kernphysik, Universität Münster, 48149 Münster, Germany

The future MAGIX experiment will use the MESA energy-recovering beam in combination with a windowless gas jet target. With this innovative target, a next phase of high-precision measurements with a reduced background compared to previous e-p scattering experiments is possible. The MAGIX gas jet target delivers a thickness of more than 10¹⁸ atoms/cm² at the interaction point when using hydrogen as target material. Providing such a target thickness requires a high gas flow rate at a cryogenic temperature, which is then pressed through a convergent-divergent nozzle. The geometry of the nozzle defines how the target expands, thus influencing the jet target’s shape and temperature. Therefore, for further target optimization, numerical simulations of the jet’s formation and propagation are necessary to refine the stagnation conditions and nozzle geometry. Additionally, a new approach—the generation of a filament jet structure with the MAGIX gas jet target—to reach even a higher thickness with better vacuum conditions is under development. The setup, performance, and development of the MAGIX gas jet target will be presented and discussed.

This project has received funding from CRC1660 (project number 514321794).

Keywords: Gas jet target; MAGIX experiment; Filament jet structure; Numerical simulations; Nozzle geometry