The New APD Based Readout for the Crystal Barrel Calorimeter

16th International Conference on Calorimetry in High Energy Physics

Urban, M.^1 ; Honisch, Ch^1 ; Steinacher, M.^2

HISKP, University of Bonn, Bonn

53115, Germany^1

Physikalisches Institut, University of Basel, Switzerland^2

关键词: Avalanche Photo Diode (APD);    Barrel calorimeter;    Characterization measurement;    Energy resolutions;    Front end electronics;    Meson photoproduction;    Polarized neutrons;    Readout Electronics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/587/1/012043/pdf
DOI  :  10.1088/1742-6596/587/1/012043

来源: IOP

【 摘 要 】

The CBELSA/TAPS experiment at ELSA measures double polarization observables in meson photoproduction off protons and neutrons. To be able to measure purely neutral reactions off polarized neutrons 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 characterization measurements of all APDs were successfully accomplished in Bonn. The project is supported by the Deutsche Forschungsgemeinschaft (SFB/TR16) and Schweizerischer Nationalfonds.