The DAQ/HLT system of the ATLAS experiment

on behalf of the ATLAS TDAQ Community

Research output: Contribution to journalConference article

Abstract

The DAQ/HLT system of the ATLAS experiment at CERN, Switzerland, is being commissioned for first collisions in 2009. Presently, the system is composed of an already very large farm of computers that accounts for about one-third of its final event processing capacity. Event selection is conducted in two steps after the hardware-based Level-1 Trigger: a Level-2 Trigger processes detector data based on regions of interest (RoI) and an Event Filter operates on the full event data assembled by the Event Building system. The detector read out is fully commissioned and can be operated at its full design capacity. This places the responsibility on the High-Level Triggers system to select only events of highest physics interest that will finally reach the offline reconstruction farms. This paper brings an overview of the current ATLAS DAQ/HLT implementation and performance based on studies originated from its operation with simulated, cosmic particles and first-beam data. Its built-in event processing parallelism is presented and discussed.

Original languageEnglish
Article number044
JournalProceedings of Science
Volume70
Publication statusPublished - Jan 1 2008
Event12th Advanced Computing and Analysis Techniques in Physics Research, ACAT 2008 - Erice, Italy
Duration: Nov 3 2008Nov 7 2008

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actuators
detectors
Switzerland
hardware
filters
physics
collisions

All Science Journal Classification (ASJC) codes

  • General

Cite this

on behalf of the ATLAS TDAQ Community (2008). The DAQ/HLT system of the ATLAS experiment. Proceedings of Science, 70, [044].

The DAQ/HLT system of the ATLAS experiment. / on behalf of the ATLAS TDAQ Community.

In: Proceedings of Science, Vol. 70, 044, 01.01.2008.

Research output: Contribution to journalConference article

on behalf of the ATLAS TDAQ Community 2008, 'The DAQ/HLT system of the ATLAS experiment', Proceedings of Science, vol. 70, 044.
on behalf of the ATLAS TDAQ Community. The DAQ/HLT system of the ATLAS experiment. Proceedings of Science. 2008 Jan 1;70. 044.
on behalf of the ATLAS TDAQ Community. / The DAQ/HLT system of the ATLAS experiment. In: Proceedings of Science. 2008 ; Vol. 70.
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abstract = "The DAQ/HLT system of the ATLAS experiment at CERN, Switzerland, is being commissioned for first collisions in 2009. Presently, the system is composed of an already very large farm of computers that accounts for about one-third of its final event processing capacity. Event selection is conducted in two steps after the hardware-based Level-1 Trigger: a Level-2 Trigger processes detector data based on regions of interest (RoI) and an Event Filter operates on the full event data assembled by the Event Building system. The detector read out is fully commissioned and can be operated at its full design capacity. This places the responsibility on the High-Level Triggers system to select only events of highest physics interest that will finally reach the offline reconstruction farms. This paper brings an overview of the current ATLAS DAQ/HLT implementation and performance based on studies originated from its operation with simulated, cosmic particles and first-beam data. Its built-in event processing parallelism is presented and discussed.",
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