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Event builder and level 3 trigger at the CDF experiment

Conference · · Computer Physics Communications
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  1. MIT
  2. Fermilab
+ Show Author Affiliations
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 ~200 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 such a high data throughput rate exceeds 45 000 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. Event flow through ATM is controlled by a reflective memory ring. The roughly homogeneous 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.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
CDF
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1898782
Report Number(s):
FERMILAB-CONF-01-552; oai:inspirehep.net:568476
Conference Information:
Journal Name: Computer Physics Communications Journal Volume: 140
Country of Publication:
United States
Language:
English

References (1)

The CDF detector: an overview
  • Abe, F.; Amidei, D.; Apollinari, G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 271, Issue 3 https://doi.org/10.1016/0168-9002(88)90298-7
journal September 1988

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