SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Instrumentation VII

HK 23.7: Talk

Thursday, September 2, 2021, 18:15–18:30, H2

Performance of the MAGIX Jet Target with an optimized Nozzle Geometry — •Philipp Brand, Daniel Bonaventura, Sophia Vestrick, and Alfons Khoukaz for the MAGIX collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

The MAGIX experiment (MAinz Gas Internal target eXperiment) aims for high precision measurements of, e.g., electromagnetic form factors, the astrophysical S-factor, and to search for light dark matter. It will be located in the energy recovery arc of the MESA accelerator which is currently under construction in Mainz. This extensive physics program requires a windowless gas target, that achieves target thicknesses of more than 10¹⁸ atoms/cm² and that can operate with various gases like, e.g., hydrogen, oxygen, or argon.

Therefore, a cryogenic gas-jet target was developed at the University of Münster which is already installed at the A1 experiment within the MAMI facility at Mainz. The jet leaves the target through a convergent-divergent Laval nozzle and already several millimeter below the nozzle the interaction with the electron beam takes place. The jet is then pumped away through a conical catcher that is connected to a powerful pumping station. The jet divergence is crucial for the target performance, since a smaller jet would increase the target thickness at the interaction point and the efficiency of the catcher system. To reduce the divergence of the jet, different Laval nozzle designs have been studied in numerical simulations. The results of measurements with an optimized nozzle will be presented and compared to the simulations.