Author/Authors :
Afanasyev، نويسنده , , L. and Gallas، نويسنده , , M. and Goldin، نويسنده , , Maria D. and Gorin، نويسنده , , A. and Karpukhin، نويسنده , , V. and Kokkas، نويسنده , , Alexander P. and Kulikov، نويسنده , , A. and Kuroda، نويسنده , , K. and Manuilov، نويسنده , , I. and Okada، نويسنده , , K. and Schuetz، نويسنده , , C. and Sidorov، نويسنده , , A. and Steinacher، نويسنده , , M. and Takeutchi، نويسنده , , F. and Tauscher، نويسنده , , L. and Vlachos، نويسنده , , S. and Yazkov، نويسنده , , V.، نويسنده ,
Abstract :
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 respect to detectors’ single rates, the detection efficiency of events in the relative momentum range of interest being ⩾95%.
