A DIRC detector for WASA-at-COSY

A Cherenkov Detector of DIRC type is envisaged for the WASA at COSY experiment to improve particle identification and energy resolution. In this context multianode photomultipliers (MAPMTs) for photon detection and different radiator materials have been investigated for their usability. Several PMMA (Plexiglas)/fused silica radiators with variously treated surfaces and two different prototypes, consisting of a radiator bar and a focusing optics, were tested using the external COSY beam. The results of these studies are presented and also compared with simulations.