Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Instrumentation

HK 49.2: Vortrag

Dienstag, 5. März 2013, 17:00–17:15, WIL-C207

Cluster Beam Visualization with MCPs — •Esperanza Köhler, Silke Grieser, Ann-Katrin Hergemöller, Alexander Täschner, Hans-Werner Ortjohann, Daniel Bonaventura, and Alfons Khoukaz — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Deutschland

A cluster-jet target will be the first installed internal target for the PANDA experiment at HESR/FAIR. For performance studies a cluster-jet target prototype in complete PANDA geometry was already built up and set successfully into operation at the University of Münster. At present this target prototype is routinely operated with hydrogen and the use of other materials such as deuterium is also possible. The observation of distinct density structures within the jet beam behind the nozzle and the use of a new tilting system lead to areal target densities of more than 2× 10 ¹⁵  atoms/cm² at a distance of 2.1 m. The thickness is reproducible, constant in time, and variable over several orders of magnitude. Depending on the experimental program the target beam size and shape is variable. This can be visualized by a new monitoring system based on a Micro Channel Plate (MCP), which allows for a direct observation of an ionized cluster beam. Therefore, the cluster beam is ionized by an electron beam and the signals in the MCP are observed by a phosphor screen in combination with a CCD camera. In this talk the performance of the cluster-jet target and MCP images of the cluster beam will be presented and discussed. Supported by EU (FP7), BMBF, and GSI F+E.