The CLEO-III trigger: Level 1 decision and gating

T. J. Bergfeld, J. A. Ernst, George D Gollin, M. J. Haney, R. M. Hans, E. E. Johnson, C. L. Plager, C. Sedlack, Mats A Selen, J. B. Williams

Research output: Contribution to conferencePaper


The Level I Decision and Data Flow/Control subsystems of the CLEO-III Trigger produce and distribute a trigger decision every 42 ns based on input from calorimetry and tracking subsystems. This paper describes the free-running pipelined trigger decision logic that correlates axial and stereo tracking information, and combines time-aligned calorimetry information onto a common backplane. Programmable trigger decision boards monitor this backplane, and can be configured as desired to respond to a wide variety of trigger conditions. The resulting trigger decision is regulated by a throttling mechanism that allows the data acquisition system to modulate the trigger rate to maximize throughput without buffer overrun. A central signal distribution mechanism delivers the trigger decision and system clock to the front-end electronics.

Original languageEnglish (US)
StatePublished - Dec 1 2000
Event2000 IEEE Nuclear Science Symposium Conference Record - Lyon, France
Duration: Oct 15 2000Oct 20 2000


Other2000 IEEE Nuclear Science Symposium Conference Record

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Industrial and Manufacturing Engineering

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    Bergfeld, T. J., Ernst, J. A., Gollin, G. D., Haney, M. J., Hans, R. M., Johnson, E. E., Plager, C. L., Sedlack, C., Selen, M. A., & Williams, J. B. (2000). The CLEO-III trigger: Level 1 decision and gating. Paper presented at 2000 IEEE Nuclear Science Symposium Conference Record, Lyon, France.