Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.81: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

Development of new Crystal-Barrel forward detectors: II. A charged particle detector, fast clustering triggerlogic and Flash-ADC readout — •Christian Funke, Torge Szczepanek, and Christoph Wendel — Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Nussallee 14-16, 53115 Bonn

The Crystal-Barrel experiment at ELSA is used to investigate the structure of hadrons with electromagnetic probes. The 4π-geometry of this electromagnetic calorimeter is particularly suited to study multi-photon final states. Due to it’s setup as a "fixed target" experiment an efficient trigger for particles and their energy determination under forward angles is important. For the upcoming data-taking period a new set of forward detectors is being developed. The focus of this poster is the new charged particle detector, the new clustering (pre-)trigger for the Crystal-Barrel calorimeter and the fast Flash-ADC CsI-Crystal-Readout using FPGAs. These systems will cover the angle of 12−30^∘ in the forward direction. Charged particle detection is achieved by two layers of szintillating material with a combined angular resolution of 6^∘. Each of the 180 plastic szintillator plates is, due to spatial constraints, read out by wavelength-shifting fibres. The trigger system for the 90 CsI crystals of the given forward segment has to be able to deliver a multiplicity count of incident hadronic showers in a timeframe of 250ns. To achieve this a fast SRAM-based solution is build. The Flash-ADC will provide additional data for particle identification and event selection.
Supported within the SFB/TR16 by the DFG.