The CLEO-III trigger: Level 1 decision and gating

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

Research output: Contribution to conferencePaperpeer-review


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 - 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

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging


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