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Event Builder and Level 3 Trigger at the CDF Experiment

Gerry Bauer1, Ivan Furic1, Don Holmgren2, Andreas Korn1, Ilya Kravchenko1, Michael Mulhearn1, Christoph Paus1, Ron Rechenmacher2, Paris Sphicas1, Sham Sumorok1, Steve Tether1, Jeff Tseng1, Frank Wuerthwein1
  1. Massachusetts Institute of Technology
  2. Fermi National Laboratory

Speaker: Ilya Kravchenko

  The Event Builder and Level 3 trigger systems of the CDF experiment at Fermilab are required to process about 300 events per second, with an average event size of 150 kB. In the event building process the event is assembled from 15 sources supplying event fragments with roughly equal sizes of 12-16 kB. In the subsequent commercial processor-based Level 3 trigger the events are reconstructed and trigger algorithms are applied. The CPU power required for filtering this rate of events exceeds 45000 MIPS. To meet these requirements a distributed and scalable architecture has been chosen. It is based on commodity components: VME-based CPU's for the data read out, an ATM switch for the event building and Pentium-based personal computers running the Linux operating system for the event processing. The roughly homogenous distribution of the expected load allows the use of 100 Mbps Ethernet for event distribution and collection within the Level 3 system. Preliminary results from a test system obtained during the last year are presented. This architecture is also a possible candidate for the CMS experiment at the LHC.

Presentation:  Adobe Acrobat pdf Long Paper:  Adobe Acrobat pdf 

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