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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.86: Poster
Thursday, March 19, 2009, 14:00–16:00, Audi-Max
New Readout Concept for the Calorimeter of the Crystal Barrel Experiment at ELSA — •Christian Honisch — HISKP, Nußallee 14-16, 53115 Bonn
The Crystal Barrel experiment at ELSA in Bonn is a double polarized photo-production experiment for hadron spectroscopy. Its EM-calorimeter is build-up of 1380 CsI crystals.
At present the CsI signals are read out with a PIN photodiode. Triggering on the calorimeter is not possible in this set-up, because the signals from the charge sensitive amplifier are slow. In the upgrade of the experiment the read-out eletronics is to be extended by a 1st level trigger for the CsI crystals. While providing fast timing signals, the new read-out system has to achieve at least the same energy resolution as the existing one.
The large risetime of the CsI crystals forces a trade-off between time resolution and latency. Avalanche photodiodes, silicon photomultipliers and the existing PIN-photodiodes, together with new read-out electronics, have been tested to generate low latency timing signals.
In this poster, results from the three sensors will be presented and compared.