Development of high density cluster-jet-targets for storage ring experiments

Cluster-jet-targets are operated successfully since many years as internal targets for storage ring experiments. In order to utilize these targets for new types of detector systems with 4π-geometry like the PANDA detector at the upcoming FAIR at GSI, cluster-jet sources have to be improved with respect to the maximum target density to allow for highest luminosities in combination with larger distances between the cluster source and the interaction region. For this purpose a cluster-jet target station has been build up at the University of Muenster which covers the required spatial requirements of a future 4π-detection system. This target station allows for systematic studies on the production of high-density cluster-jet beams. Recent modifications resulted in an increase in target densities of a factor of more than 10 compared to hitherto existing cluster targets. In this contribution we will present newest results in the measurement of the velocity and the mass distribution of the produced cluster beam and studies on a prototype setup for the PANDA detector. (orig.)