Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation

HK 26.4: Vortrag

Mittwoch, 21. März 2012, 15:00–15:15, P 2

Studies on cluster beam shapes for storage ring experiments — •Ann-Katrin Hergemöller, Esperanza Köhler, Alexander Täschner, Hans-Werner Ortjohann, Daniel Bonaventura, and Alfons Khoukaz — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Deutschland

One of the two planned internal targets for the PANDA experiment at the accelerator center FAIR will be a cluster-jet target. With this type of 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 this cluster-jet target was built up in PANDA geometry and set successfully into operation. With this installation hydrogen target densities of 1.5×10¹⁵ atoms/cm² were achieved at 2 m behind the cluster source. 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. Since parallel to the absolute target density also a low residual gas background at the interaction region is of high interest, 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. First results of beam properties with a shaped cluster beam by slit collimators will be presented and discussed. Supported by EU (FP6+FP7), BMBF, and GSI F+E.