The multilevel trigger system of the DIRAC experiment

Details The multilevel trigger system of the DIRAC experiment The multilevel trigger system of the DIRAC experiment

2002-02-28

arxiv.org/abs/hep-ex/0202045v1

Nucl.Instrum.Meth. A491 (2002) 376-389

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 11 figures

Scientific paper

10.1016/S0168-9002(02)01277-9

The multilevel trigger system of the DIRAC experiment at CERN is presented. It includes a fast first level trigger as well as various trigger processors to select events with a pair of pions having a low relative momentum typical of the physical process under study. One of these processors employs the drift chamber data, another one is based on a neural network algorithm and the others use various hit-map detector correlations. Two versions of the trigger system used at different stages of the experiment are described. The complete system reduces the event rate by a factor of 1000, with efficiency $\geq$95% of detecting the events in the relative momentum range of interest.

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