Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Instrumentation V

HK 29.6: Talk

Wednesday, April 1, 2020, 15:30–15:45, J-HS C

Energy Sum Trigger for the Crystal Barrel Detector — •Bence Mitlasoczki for the CBELSA/TAPS collaboration — Universität Bonn

The CBELSA/TAPS experiment at the ELSA accelerator in Bonn performs baryon spectroscopy measurements. The 1320 crystals of the main calorimeter, the Crystal Barrel, are included in the trigger system via discriminators, and a cluster finder is utilized to trigger on the number of clusters.

For reactions with small cross sections the trigger selectivity is the main limiting factor to the acquisition of relevant events due to background reactions using up a large part of the readout capacity. The inclusion of the total energy into the trigger system will provide an improvement.

In this talk, I will present an improved design and first performance tests of the recently installed energy sum modules. To be able to precisely set an energy threshold, the difference in amplitudes of the responses to deposited energy of each crystal needs to be accounted for. For this purpose, a weighting of individual signals is needed. The summing modules use multiplying DACs to provide this weight adjusting capability. A DAC is used for removing the offset in the sum signal. Communication with the modules is possible via I2C.