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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.81: Poster
Monday, March 7, 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.