Event Builder and Level 3 trigger at the CDF experiment

Citation
K. Anikeev et al., Event Builder and Level 3 trigger at the CDF experiment, COMP PHYS C, 140(1-2), 2001, pp. 110-116
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
COMPUTER PHYSICS COMMUNICATIONS
ISSN journal
0010-4655 → ACNP
Volume
140
Issue
1-2
Year of publication
2001
Pages
110 - 116
Database
ISI
SICI code
0010-4655(20011015)140:1-2<110:EBAL3T>2.0.ZU;2-#
Abstract
The Event Builder and Level 3 trigger systems of the CDF experiment at Ferm ilab are required to process about 300 events per second, with an average e vent size of similar to 200 KB. In the event building process the event is assembled from 15 sources supplying event fragments with roughly equal size s 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 45000 MIPS. To meet these requirements a distributed and scalable architecture h as been chosen. It is based on commodity components: VME-based CPU's for th e data read out, an ATM switch for the event building and Pentium-based per sonal computers running the Linux operating system for the event processing . Event flow through ATM is controlled by a reflective memory ring. The rou ghly homogeneous distribution of the expected load allows the use of 100 Mb ps Ethernet for event distribution and collection within the Level 3 system . Preliminary results from a test system obtained during the last year are presented. (C) 2001 Elsevier Science B.V. All rights reserved.