Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.20: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

Design of the new Crystal-Barrel forward cone — •Philipp Hoffmeister and Christoph Wendel — Helmholtz-Institut für Strahlen- und Kernphysik der RFWU Bonn, 53115 Bonn

The main purpose of the Crystal-Barrel detector at ELSA is to investigate the structure of hadrons. A barrel-shaped setup of CsI-Crystals is used, allowing the investigation of multi-photon final states. Since the Crystal-Barrel is a "fixed target" experiment, the forward direction demands special attention. Until the end of 2003, the TAPS detector was used to cover the inner 30^∘ of the forward direction. The loss of the TAPS detector made it necessary to construct a new forward calorimeter with fast trigger capabilities for photons and charged particles. Therefore the pre-TAPS Crystal-Barrel setup is modified by replacing the photodiode readout with fast photomultipliers and a redesigned electronic backend, providing a trigger fast enough to cope with the high photon flux used in the experiment. Additionally two thin layers of szintillating material with fibre readout are placed in front of the crystals, providing a fast trigger for charged particles.
This poster will describe in detail these modifications and the design of the new Forward Plug.