Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Instrumentation

HK 49.1: Talk

Tuesday, March 5, 2013, 16:45–17:00, WIL-C207

Shaping of Cluster-Jet Beams for Storage Ring Experiments — •Ann-Katrin Hergemöller, Silke Grieser, Esperanza Köhler, Alexander Täschner, Hans-Werner Ortjohann, Daniel Bonaventura, and Alfons Khoukaz — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Deutschland

With a cluster-jet target high and constant densities at the interaction point can be achieved and adjusted continuously during operation. At the University of Münster the prototype of the cluster-jet target for the PANDA experiment was built up in PANDA geometry and set successfully into operation. Due to observed structures within the cluster beam, a tilting system was installed, allowing for an adjustment of the nozzle system relative to the experimental setup. With this installation target densities of more than 2×10¹⁵ atoms/cm² were achieved at 2.1 m behind the nozzle. By the use of special shaped skimmers it is possible to determine the size and shape of the cluster beam at the later scattering chamber. Beside the absolutely target density also a low residual gas background at the interaction region is of high interest. Thus the identification of an optimized skimmer geometry will be of high relevance for the experimental conditions at PANDA. From measured cluster beam profiles it is possible to calculate both the expected areal density at the interaction point as well as the gas background. The results of target beam properties with a shaped cluster beam by slit collimators will be presented and discussed. Supported by EU (FP7), BMBF, and GSI F+E.