The D0 Level 2 Trigger

Linnemann, James T.
September 2001
International Journal of Modern Physics A: Particles & Fields; G;9/10/2001 Supplement C, Vol. 16, p1166
Academic Journal
The DO Level 2 trigger (L2), a subsystem of the three-stage DO trigger, reduces event rates from 10 KHz to 1 KHz. The system is organized as a global processor and preprocessors for the calorimeter, muon, tracker, and preshower subsystems. Preprocessors digest information from a single detector system and produce a list of the objects. The global processor receives the object lists, matches across detectors, and applies selection criteria to the objects. The system can buffer 16 events. The L2 design has been guided by extensive queuing simulations. The system is presently being commissioned, with all components available as either pre-production or production boards.


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