Integration of the trigger and data acquisition systems in ATLAS

ATLAS COLLABORATION, M ABOLINS, MT DOVA ET AL

Journal of Physics: Conference Series

IOP

Año: 2008 vol. 119 p. 1 - 10

1742-6588

During 2006 and the frst half of 2007, the installation, integration and commissioning of trigger and data acquisition (TDAQ) equipment in the ATLAS experimental area have progressed. There have been a series of technical runs using the nal components of the system already installed in the experimental area. Various tests have been run including ones where level 1 preselected simulated proton-proton events have been processed in a loop mode through the trigger and data ow chains. The system included the readout buers containing the events, event building, level 2 and event lter trigger algorithms. The scalability of the system with respect to the number of event building nodes used has been studied and quantities critical for the system, such as trigger rates and event processing times, have been measured using different trigger algorithms as well as different TDAQ components. This paper presents the TDAQ architecture, the current status of the installation and commissioning and highlights the main test results that validate the system.