Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.80: Poster
Montag, 7. März 2005, 16:30–18:00, TU MA141
Development of new Crystal-Barrel forward detectors: I. The forward plug crystal readout and the Mini-TAPS detector. — •Volker Hannen1, Philipp Hoffmeister2, Vahe Sokhoyan1, and Ulrike Thoma1,2 — 1II. Phys. Inst. der Universität Giessen, Heinrich-Buff-Ring 16, 35392 Giessen — 2HISKP, Universität Bonn, Nussallee 14-16, 53115 Bonn
The structure of hadrons is investigated by the Crystal-Barrel experiment
at
ELSA using electromagnetic probes.
Due to its setup as a fixed target experiment the coverage of forward
angles is of special importance. Here two new forward detectors will be
installed
for the planned double polarisation measurements. The so-called Forward
Plug, consisting
of 90 CsI crystals, which covers forward angles from 30∘ to
11∘ and
the Mini-TAPS detector, consisting of 60 TAPS BaF2 crystals, which
completes the
angular coverage down to 2∘. The readout of the Forward Plug
crystals is done by photomultipliers, unlike
the rest of the barrel, where photodiodes are used. In addition, plastic
scintillators will be mounted in front of each crystal for both detector
systems. Their signals can be used together with the ones from the
crystals
to provide an efficient trigger for charged and neutral particles.
In addition to the setup, we will present test results of the new
photomultiplier readout of the Forward Plug crystals, discuss its newly
designed backend electronics and provide an overview of the readout
electronics to be used with the Mini-TAPS detectors.
Supported within the Emmy-Noether-program and the SFB/TR16 by the DFG.