Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation X

HK 44.5: Talk

Thursday, March 13, 2025, 15:00–15:15, SR Exp1B Chemie

Upgrade of the time readout of the Crystal Barrel detector — •Florian Taubert for the CBELSA/TAPS collaboration — University of Bonn

The CBELSA/TAPS experiment in Bonn conducts baryon spectroscopy utilizing linearly or circularly polarized photon beams impinging on a target, which can be polarized longitudinally or transversally. With this setup it is possible to obtain information on single and double polarization observables of photoproduction processes of single or multiple neutral mesons, e.g. γ p→ pπ⁰.

The main detector system consists of the Crystal Barrel (CB) and MiniTAPS calorimeters, combined with scintillators and scintillating fibers for charged particle detection. The Crystal Barrel is made up of 1320 CsI(Tl) crystals, which are arranged in a barrel shape around the target. Together with MiniTAPS covering the forward direction the system can cover a solid angle of almost 4π.

The readout of the CB detector consists of one energy and one timing branch. The time readout is incorporated on a VMEbus module with a Spartan6 FPGA and is done by a local VMEbus-CPU. To reduce deadtime and increase readout speed each module, 16 in total, was extended by a gigabit interface to overcome the limited transfer rate over VMEbus.

This talk presents details of the gigabit upgrade including implementation and achieved performance.

Keywords: CBELSA/TAPS; DAQ; Gigabit