/ Experiment-HEP hep-ex/0202045

The Multilevel trigger system of the DIRAC experiment

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.

Published in: Nucl.Instrum.Meth.
Year: 2002
Vol.: A491
Page No: 376-389
Pages: 21

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 efficiency $\geq$95% of detecting the events in the relative momentum range of interest.

Web-Page: http://alice.cern.ch/format/showfull?sysnb=2297040; http://www1.jinr.ru/Preprints/2002/01_index.html; http://www.sciencedirect.com/science?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=01689002%23491%23376&_version=1&md5=381a57e9a875abb08259fb4b37b98975; http://www.sciencedirect.com/web-editions?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=01689002%23491%23376&_version=1&md5=381a57e9a875abb08259fb4b37b98975; http://www1.jinr.ru/Preprints/2002/032(E1-2002-32).pdf; http://lt-jds.jinr.ru/record/25701/files/032%28E1-2002-32%29.pdf

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