SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Instrumentation V

HK 14.3: Vortrag

Dienstag, 21. März 2023, 18:00–18:15, SCH/A.101

Clustersize distribution measurement using the three wavelength extinction method — •Sophia Vestrick, Philipp Brand, Hanna Eick, Jost Froning, ErenCem Göktas, Lennart Halstenberg, Christian Mannweiler, Michael Weide, and Alfons Khoukaz — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

In a cluster source, cryogenic hydrogen, gaseous or liquid, is forced through a Laval nozzle and expanded into a vacuum. The hydrogen formes droplets consisting of millions of atoms. The diameters of the resulting clusters vary by severeral orders of magnitude. When starting, e.g., with liquid hydrogen, the clusters can reach diameters from some nanometers up to several micrometers, but the specific distribution is not yet known. In the three wavelength extinction method (3WEM), three lasers with different wavelengths are aligned to an interaction region and collimated onto one detector each. When the cluster-jet crosses the interaction region the intensity of all three lasers is reduced. Since the resulting extinction ratio depends on the known wavelength of the laser as well as on the clustersizes, this method can be used to determine the size distribution of the clusters. The 3WEM was first tested with sprays of known diameter distribution for verification and afterwards installed at a Münster Cluster-Jet Target. First results are presented in this talk. This project has received funding from BMBF (05P21PMFP1), GSI FuE (MSKHOU2023) and the EU's Horizon 2020 programme (824093).