Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Instrumentation VI

HK 22.4: Talk

Tuesday, March 15, 2016, 15:00–15:15, S1/01 A3

Avalanche Photo Diode Based Readout of the Crystal Barrel Calorimeter — •Martin Urban for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

The CBELSA/TAPS experiment at ELSA in Bonn has measured double polarization observables in meson photoproduction off the proton in the last few years. To be able to extend these measurements in future also to purely neutral final states produced off a polarized neutron target with high efficiency, the main calorimeter consisting of 1320 CsI(Tl) crystals has to be integrated into the first level trigger.

Key requirement to achieve this goal was the upgrade of the existing PIN photo diode by a new avalanche photo diode (APD) readout. The main advantage of the new readout system is to provide a fast timing signal which allows a fast decision on the number of cluster in an event.

The upgrade of the calorimeter has been finalized during the last year. Beside the status of the upgrade, this talk will focus on the single crystal calibration and on the development of a new light pulser system.

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