Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.18: Poster

Thursday, April 2, 2020, 16:30–18:30, Zelt

Impact of Laval Nozzle Length on Properties of Cluster Beams — •Sophia Vestrick, Philipp Brand, Silke Grieser, and Alfons Khoukaz for the PANDA collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

The understanding of cluster formation processes within Laval nozzles is from highest interest for targets for high luminosity experiments, e.g. for the PANDA cluster-jet target with a thickness of more than 2 × 10¹⁵ atoms/cm² in a nozzle distance of >2 m. One important parameter is the nozzle length. With a smaller nozzle length the typically challenging fabrication process becomes easier and therefore nozzles of higher quality can be produced.

The influence of the nozzle length on the cluster formation process and the quality of the resulting cluster beam were investigated at the PANDA cluster-jet target prototype at the University of Münster using a 35 µm nozzle by shortening its diverging outlet section. In comparison to these measurements, computational fluid dynamics (CFD) is used to simulate the gas flow through the used nozzle in dependence of different nozzle lengths and stagnation conditions. The results of these measurements and simulations together can give further insights into the cluster production process and an optimized nozzle length.

This project has received funding from BMBF (05P19PMFP1) and GSI F&E.