Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.88: Poster

Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster

A New Avalanche Photo Diode Readout for the Crystal Barrel Calorimeter — •Peter Klassen for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn, Germany

The CBELSA/TAPS experiment at ELSA measures double polarisation 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 newly developed readout electronics will provide an energy resolution compatible to the previous set-up and a fast trigger signal down to 10 MeV energy deposit per crystal. After the successful final tests with a 3x3 CsI crystal matrix in Bonn at ELSA and in Mainz at MAMI all front-end electronics were produced in fall 2013. Automated test routines for the front-end electronics were developed and the characterisation measurement of all APDs was successfully accomplished in Bonn. At the end of January 2014 the first half of the Crystal Barrel will be disassembled and the installation of the new APD readout will start. This poster presents the performance of the final front-end set-up, the progress of the ongoing APD installation and the current state of the back-end electronics development.

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