Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Instrumentation 15

HK 50.4: Talk

Thursday, March 26, 2015, 15:30–15:45, M/HS1

Development of the timing branch electronics for the Crystal Barrel Calorimeter — •Peter Klassen for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

The excitation spectrum of baryons consists of many resonances which contribute selectively to distinct decay channels. To be able to measure purely neutral reactions on a polarized neutron target with high efficiency, the Crystal Barrel Detector which consists of 1320 CsI(Tl) crystals has to be integrated into the first level trigger. This requires an exchange of the existing PIN photo diode by a new avalanche photo diode (APD) crystal readout.

The APD readout electronics will provide a fast trigger signal down to 10 MeV energy deposit per crystal. The processing of these trigger signals requires an introduction of a previously not existent timing branch to the readout chain of the main calorimeter.

The final concept and current development status of the timing back-end will be presented. It utilizes FPGA based boards for rise time compensation, time to digital conversion and the cluster finding.

Supported by the Deutsche Forschungsgemeischaft (SFB/TR16) and Schweizerischer Nationalfonds.