Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Poster

HK 46.10: Poster

Thursday, March 20, 2014, 16:00–18:00, HZ Poster

The APD High Voltage Board Characterization Station for the Crystal Barrel Calorimeter — •Dimitri Schaab for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn, Germany

The Crystal Barrel experiment investigates the inner dynamics of nucleons by baryon spectroscopy in photoproduction processes.
In order to enhance the acceptance for the photoproduction off the neutron a major hardware upgrade has been initialized in the past. It is about the upgrade from the currently used PIN-photodiode readout to a readout with avalanche-photodiodes (APD). The new concept provides a faster timing signal and allows the main calorimeter, which consists of 1230 scintillator crystals, to be part of the first level trigger stage.
The complete front-end electronics has been re-designed where the high voltage supply board is adapted to the temperature sensitive gain of the APDs. Before the electronics can be built into the calorimeter all supply boards have to be tested and characterized. The main tasks of the characterization station is to calibrate the on-board voltage measurement circuits and the voltage control as well as to test the functionality of the temperature compensation.
The performance and results of the APD High Voltage Board Characterization Station will be presented.
Supported by the Deutsche Forschungsgemeischaft (SFB/TR16) and Schweizerischer Nationalfonds.