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Higher level trigger systems for the HERA-B experiment

M. Dam, R. Dippel, S. Erhan, A. Gellrich, J.D. Hansen, J.R. Hansen, P. Kreuzer, I. Legrand, H. Leich, J. Luedemann, M. Medinnis, B. Rensch (+10 others)
1998 IEEE Transactions on Nuclear Science  

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The HERA-B experiment [1, 2] is designed for observation of CP violation in the B-meson system at the HERA machine in DESY. The data acquisition and triggering system must cope with a half million detector channels, a 40 MHz interaction rate and a signal to background ratio of ¥ . A highly selective multi-level trigger and high bandwidth data acquisition system has been designed and is currently being implemented. The second-level event buffer and mid-level trigger switch will be built from DSP
more » ... boards carrying SHARC processors. The second and third level trigger code will run on a farm of 100-200 Pentium processors under Linux. The switch to the 4th level trigger farm will be based on fast-ethernet.
doi:10.1109/23.710937 fatcat:xudc6acskzgt7il65cfgdyzksi
Citation

M. Dam, R. Dippel, S. Erhan, A. Gellrich, J.D. Hansen, J.R. Hansen, P. Kreuzer, I. Legrand, H. Leich, J. Luedemann, M. Medinnis, B. Rensch, D. Ressing, S. Scharein, S. Schmidt, K.H. Sulanke, F. Sun, H. Thurn, G. Wagner, P. Wegner, S. Xella, J. Zweizig. "Higher level trigger systems for the HERA-B experiment." IEEE Transactions on Nuclear Science 45.4 (1998) 1787-1792