CERN Accelerating science

ATLAS Note
Report number	ATL-DAQ-PROC-2009-047
Title	The Configuration System of the ATLAS Trigger
Author(s)	Bell, P (Manchester U.) ; Berge, D (Cern) ; Brunet, S (DESY) ; Fischer, G (DESY) ; Goebel, M (DESY) ; Haller, J (DESY ; Hamburg U.) ; Head, S (Manchester U.) ; Höcker, A (Cern) ; Kono, T (Cern) ; Martyniuk, A (Manchester U.) ; Nozicka, M (DESY) ; Owen, M (Manchester U.) ; Spiwoks, R (Cern) ; Stelzer, J (DESY) ; Wengler, T (Manchester U.) ; Wiedenmann, W (Wisconsin U.)
Corporate Author(s)	The ATLAS collaboration
Publication	2009
Imprint	20 Dec 2009
Number of pages	4
In:	IEEE Nuclear Science Symposium And Medical Imaging Conference, Orlando, FL, USA, 25 Oct - 31 Oct 2009
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Relational databases ; Data Acquisition ; Triggering
Abstract	The ATLAS detector at CERN’s LHC will be exposed to proton-proton collisions at a rate of 40 MHz. To reduce the data rate to a manageable final output rate of 200Hz, only potentially interesting events are selected by a three-level trigger system. A system has been designed and implemented that enables the configuration of all three trigger levels from a centrally maintained relational database, for the purpose of both online data taking and offline trigger simulation. We present the current status of this trigger configuration system, covering the database design, client software and user interface tools, and putting emphasis on its multiple uses for data-taking, Monte-Carlo simulation, and trigger validation on express-stream data.
Copyright/License	Preprint: (License: CC-BY-4.0)

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