Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Instrumentation

HK 46.7: Talk

Tuesday, March 5, 2013, 18:15–18:30, WIL-A221

Characterization Measurements of the new APD-Based Readout of the CB Calorimeter at MAMI and ELSA — •Christian Honisch — HISKP, Nussallee 14-16, 53175 Bonn, Germany

One goal of the CBELSA/TAPS-Experiment is the measurement of double polarization observables in meson photoproduction, with the Crystal Barral calorimeter (CB) as the central detector component. In the current setup the trigger efficiency for purely neutral reactions (e.g. γ n → n π⁰) is limited, because the CB is only integrated in the second level of the trigger. To improve the trigger efficiency for purely neutral channels, the existing PIN photo diode readout has to be replaced. The new avalanche photo diode (APD) readout will improve the signal to noise ratio and provide a timing signal fast enough, to include the CB in the first level trigger. The utilization of APDs allows the future operation of the CB calorimeter in a 2 T magnetic field.
A 3x3 matrix of CB crystals equipped with the new APD readout has been tested in the tagged photon beams at ELSA and MAMI. The results of these test measurements including energy resolution, time resolution, and active gain stabilization of the new APD readout electronics will be presented in this talk.
Supported by the Deutsche Forschungsgemeischaft (SFB/TR16) and Schweizerischer Nationalfonds.