Abstract

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> During 2006 and spring 2007, integration and commissioning of trigger and data acquisition (TDAQ) equipment in the ATLAS experimental area has progressed. Much of the work has focused on a final prototype setup consisting of around eighty computers representing a subset of the full TDAQ system. There have been a series of technical runs using this setup. Various tests have been run including those where around 6 k Level-1 preselected simulated proton–proton events have been processed in a loop mode through the trigger and dataflow chains. The system included the readout buffers containing the events, event building, second level and third level trigger processors. Aspects critical for the final system, such as event processing times, have been studied using different trigger algorithms as well as the different dataflow components. </para>

Highlights

  • The ATLAS experiment [1][2] is a general purpose protonproton detector designed to exploit the full discovery potential of the Large Hadron Collider (LHC) currently under construction at CERN

  • It is guided by the Region of Interest (RoI) information supplied by the Level-1 trigger and gathered in custom made 9U VME boards, the RoI Builder (ROIB)

  • It is functionally decomposed in four building blocks: the ReadOut System (ROS), the RoI Collection, the Event Builder (EB) and the Event Filter I/O

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Summary

22 August 2007

Various tests have been run including ones where around 6k Level-1 pre-selected simulated proton-proton events have been processed in a loop mode through the trigger and dataflow chains. Quantities critical for the final system, such as event processing times, have been studied using different trigger algorithms as well as different dataflow components

INTRODUCTION
DataFlow system description
THE INTEGRATION TASK
Description of the tests
Integrated trigger menu
Level-2 trigger algorithm time results
EF trigger algorithm time results
CONCLUSIONS
Full Text
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