Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Instrumentation XIV

HK 59.3: Talk

Thursday, March 13, 2025, 18:00–18:15, SR Exp1B Chemie

Analysis of the hydrogen cluster sizes using shadowgraphy measurements — •Clara Fischer, Hanna Eick, and Alfons Khoukaz — Institute for Nuclear Physics, University of Münster

The PANDA cluster-jet target will be installed at the High Energy Storage Ring at FAIR and will provide a target thickness of more than 10¹⁵ atoms/cm² at the interaction point, which is more than 2 meters away from the origin.

To study the properties of the cluster beam and the cluster themselves, one can use shadowgraphy measurements. This method is based on the illumination of a cluster beam using a pulsed laser in e.g., the nanosecond regime. By the analysis of the shadowgraphy images, one can determine the cluster sizes, size distribution and investigate the dependency of the clusters on target parameters. This information is of special interest for both the later data analysis and simulation of storage ring data.

Initial shadowgraphy measurements carried out with a Münster cluster-jet target have already demonstrated the feasibility of this method and provided important initial information on cluster sizes. Based on this, more refined and comprehensive measurements will now be carried out to determine the granularity and size distribution of the cluster jets as well as the trajectories of the individual target particles.

This talk gives an overview of the planning and initial realisation of the shadowgraphy measurements in Münster. This research project was supported by the EU Horizon 2020 programme (824093), BMBF (05P21PMFP1) and NRW Netzwerke (NW21-024-E).

Keywords: shadowgraphy; cluster-jet beams; internal beam target