Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster - Instrumentation I

HK 52.3: Poster

Wednesday, March 6, 2013, 16:45–19:00, HSZ 2.OG

A New Avalanche Photo Diode Readout for the Crystal Barrel Calorimeter — •Martin Urban — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

The CBELSA/TAPS experiment at ELSA measures double polarisa- tion observables in meson photoproduction off protons and neutrons. To be able to measure purely neutral reactions on a polarized neutron target with high efficiency, the main calorimeter has to be integrated into the first level trigger. This requires to exchange the existing PIN photo diode by a new avalanche photo diode (APD) readout.

The new electronics, including a whole new timing readout branch, will provide a fast trigger signal down to 10 MeV energy deposit per crystal. A 3x3 CsI crystal matrix, assembled with the complete new APD readout electronics, has been tested at the tagged photon beam facilities at ELSA and MAMI. This poster presents the results of these test measurements including energy resolution, time resolution and the active gain stabilization of the new APD readout electronics.

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