Abstract
The aim of the project D.3 is the upgrade of several detector components used in the CBELSA/TAPS experiment at ELSA. The readout of the Crystal Barrel Calorimeter will be extended by a timing branch in order to gain trigger capability for the detector, which will allow to measure completely neutral final states in photoproduction reactions (see projects A.1 and C.5). Additionally, the readout of the inner crystals of the TAPS detector, which covers the forward opening of the Crystal Barrel Calorimeter, will be modified to be capable of high event rates due to the intensity upgrade of ELSA. Furthermore, a full-scale prototype Time Projection Chamber (TPC) has been built to be used as a new central tracker for the CBELSA/TAPS experiment at ELSA and the FOPI experiment at GSI.
Highlights
2.1 Situation before the SFBThe data acquisition of the CBELSA/TAPS experiment is built up in gated mode
The aim of the project D.3 is the upgrade of several detector components used in the CBELSA/TAPS experiment at ELSA
The readout of the inner crystals of the TAPS detector, which covers the forward opening of the Crystal Barrel Calorimeter, will be modified to be capable of high event rates due to the intensity upgrade of ELSA
Summary
The data acquisition of the CBELSA/TAPS experiment is built up in gated mode This means that the experiment has a global trigger signal, which needs to be distributed to each module involved in digitizing data. To achieve the allowed latency for trigger signals, the propagation delay on cables and the processing time of the central trigger module has to be taken into account. This results in a maximum latency of 500 ns. Due to its long latency of 10 μs, the hit information cannot be used to start the acquisition process This results in a limited trigger efficiency for reactions with purely neutral final states, like γn → nπ0.
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