SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Instrumentation IV

HK 11.3: Talk

Tuesday, August 31, 2021, 14:45–15:00, H4

Implementation of a MiniTAPS Trigger Board for the CBELSA/TAPS Experiment — •Lisa Richter, Annika Thiel, Janis Hoff, Peter Klassen, and Christian Honisch for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn

The nucleon excitation spectrum is probed by the CBELSA/TAPS experiment by studying different photoproduction reactions using real photon beam on a polarized or unpolarized target. The experimental setup comprises mainly two electromagnetic calorimeters, the Crystal Barrel and the MiniTAPS detector, focusing on neutral mesons in the final state that decay to photons. Since the CBELSA/TAPS is a fixed target experiment, many decay particles are boosted in forward direction.

Here, the MiniTAPS detector is located, which consists of 216 hexagonal BaF2 crystals which are read out via photomultiplier tubes. It covers the forward angle between 1° and 12° and can capture photons with energies between 10 MeV and 2.0 GeV. To avoid wrong trigger information due to overlapping clusters, the crystals are arranged in four sectors and the number of hits in a sector in one event is determined by the trigger. The new MiniTAPS trigger replaces the old MCU (multiple coincidence unit) electronics. It is realized by a single FPGA in a VME module. This not only simplifies the electronics but also allows for more sophisticated trigger algorithms including e.g. a fast cluster finder. The new setup of the trigger and the current status of the analysis will be presented in this presentation.