A Tracking Fiber Detector based on Silicon Photomultipliers for the KAOS Spectrometer

Abstract—A tracking detector based on two meters long scintillating fibers read out by silicon photomultipliers (SiPM) is being developed for the KAOS spectrometer at the Mainz Microtron MAMI. Results from a prototype setup using 2 mm square fibers and large area SiPM readout are presented. The detection efficiency of such a combination was measured to be between 83 and 100 % depending on the threshold on the SiPM amplitude. A Monte Carlo simulation based on a physical model was employed in order to extract the photon detection efficiency of the SiPM devices