München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Instrumentation XII

HK 53.5: Talk

Thursday, March 21, 2019, 15:15–15:30, HS 12

Gas Flow Simulations for the Design of Jet Nozzles for Cluster-Jet Targets — •Philipp Brand, Daniel Bonaventura, Silke Grieser, Alfons Khoukaz, and Lukas Lessmann for the MAGIX collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

The future MAGIX experiment (MESA Gas Internal target eXperiment) aims for high precision measurements of the electromagnetic form factors, the astrophysical S-factor and for the search of the dark photon. It will be located in the energy recovery arc of the electron accelerator MESA (Mainz Energy-recovering Superconducting Accelerator) which will deliver an 105 MeV electron beam with currents of up to 10 mA. To achieve luminosities of 10³⁵ cm⁻²s⁻¹, target thicknesses up to 10¹⁹ atoms/cm² are required which will be fulfilled directly behind the nozzle of a windowless cluster-jet target designed and built up at the University of Münster. Due to the high gas load this target works close to the transition from a gas jet to a cluster-jet target which makes the nozzle design crucial. For a complete understanding of the expansion process within the nozzle, computational fluid dynamics (CFD) is used to simulate the gas flow through different nozzle designs. The results of these simulations are presented and compared to measurements performed at MAMI (MAinz MIcrotron) with the MAGIX target. Finally, the consequences of the different nozzle designs for the cluster production are discussed.