Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 12: Poster Session: Instrumentation and Applications
HK 12.20: Poster
Tuesday, March 9, 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.