Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Instrumentation VII

HK 29.6: Vortrag

Dienstag, 15. März 2016, 17:45–18:00, S1/01 A2

Data acquisition at the BGO-OD experiment — •Daniel Hammann for the BGO-OD collaboration — Physikalisches Institut, Universität Bonn

The BGO-OD experiment, located at the 3.5 GeV electron accelerator ELSA in Bonn, is investigating photo-production of mesons. It combines a highly segmented electromagnetic calorimeter, covering almost 4π, with an open dipole spectrometer for the forward angles. To acquire the data from the various detectors of the setup, a distributed data acquisition system was set up. A global trigger signal is distributed using a dedicated FPGA based synchronization system. This trigger signal is also used as hardware reference for all time measurements. Offline reconstruction of the trigger logic allows to further improve the time reference in software. An even more precise timing reference can be derived from the ELSA acceleration frequency. A dedicated TDC measures the phase difference between the global trigger signal and the ELSA frequency. With this the knowledge of the event time is only limited by the intrinsic resolution of the TDC and the electron bunch length.

supported by the DFG within the SFB / TR16