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The multilevel trigger system of the DIRAC experiment

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 t...

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Detalles Bibliográficos
Autores principales: Afanasyev, L., Gallas, M., Goldin, D., Gorin, A., Karpukhin, V., Kokkas, P., Kulikov, A., Kuroda, K., Manuilov, I., Okada, K., Schuetz, C., Sidorov, A., Steinacher, M., Takeutchi, F., Tauscher, L., Vlachos, S., Yazkov, V.
Lenguaje:eng
Publicado: 2002
Materias:
Acceso en línea:https://dx.doi.org/10.1016/S0168-9002(02)01277-9
http://cds.cern.ch/record/539883
Descripción
Sumario: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.