Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 4: Instrumentation and Applications I

HK 4.11: Vortrag

Montag, 8. März 2004, 18:30–18:45, C

Upgrade of the 30^∘ forward cone of the Crystal-Barrel-Detector — •Christian Funke — Helmholtz-Institut für Strahlen- und Kernphysik der RFWU Bonn, 53115 Bonn

The Crystal-Barrel experiment at ELSA is used to investigate the structure of hadrons by electromagnetic probes. The 4π-geometry of this electromagnetic calorimeter especially predestines this experiment for the research on multi-photon final states. Due to it’s setup as a "fixed target" experiment an efficient trigger for particles (photons and protons in our case) and their energy determination under small forward angles is a subject of great importance. The TAPS detector covering the 30^∘ forward angle provided this functionality until December 2003. To maintain this ability a new forward-detector based on the 90 CsI-(Tl) crystals of the original Crystal-Barrel configuration is under development. The existing photodiode based readout is replaced by fast photomultipliers and matching back-end electronics. Additionally the front of the crystals facing the reaction target will be outfitted with 2 additional layers of plastic-scintillators which allow to trigger on and separate charged particles. In order to provide (pre-)trigger signals for the data acquisition system a fast SRAM-based cluster-finder-logic is being developed. This talk summarizes the current status and capabilities of this new forward-detector. This project is supported by the DFG.