Armstrong, S and dos Anjos, A and Baines, JTM and Bee, CP and Biglietti, M and Bogaerts, JA and Boisvert, V and Bosman, M and Caron, B and Casado, P and Cataldi, G and Cavalli, D and Cervetto, M and Comune, G and Muino, PC and De Santo, A and Gomez, MD and Dosil, M and Ellis, N and Emeliyanov, D and Epp, B and Etienne, F and Falciano, S and Farilla, A and George, S and Ghete, V and Gonzalez, S and Grothe, M and Kabana, S and Khomich, A and Kilvington, G and Konstantinidis, N and Kootz, A and Lowe, A and Luminari, L and Maeno, T and Masik, J and di Mattia, A and Meessen, C and Mello, AG and Merino, G and Moore, R and Morettini, P and Nikitin, AN and Nisati, A and Padilla, C and Panikashvili, N and Parodi, F and Reale, VP and Pinfold, JL and Pinto, P and Qian, Z and Resconi, S and Rosati, S and Sanchez, C and Santamarina, C and Scannicchio, DA and Schiavi, C and Segura, E and de Seixas, JM and Sivoklokov, S and Soluk, R and Stefanidis, E and Sushkov, S and Sutton, M and Tapprogge, S and Thomas, E and Touchard, F and Pinto, BV and Vercesi, V and Werner, P and Wheeler, S and Wickens, FJ and Wiedenmann, W and Wielers, M and Zobernig, G (2005) Design, deployment and functional tests of the online event filter for the ATLAS experiment at LHC. IEEE T NUCL SCI , 52 (6) 2846 - 2852. 10.1109/TNS.2005.862790.
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Abstract
The Event Filter (EF) selection stage is a fundamental component of the ATLAS Trigger and Data Acquisition architecture. Its primary function is the reduction of data flow and rate to values acceptable by the mass storage operations and by the subsequent offline data reconstruction and analysis steps. The computing instrument of the EF is organized as a set of independent subfarms, each connected to one output of the Event Builder (EB) switch fabric. Each subfarm comprises a number of processors analyzing several complete events in parallel. This paper describes the design of the ATLAS EF system, its deployment in the 2004 ATLAS combined test beam together with some examples of integrating selection and monitoring algorithms. Since the processing algorithms are not explicitly designed for EF but are adapted from the offline ones, special emphasis is reserved to system reliability and data security, in particular for the case of failures in the processing algorithms. Other key design elements have been system modularity and scalability. The EF shall be able to follow technology evolution and should allow for using additional processing resources possibly remotely located.
| Type: | Article |
|---|---|
| Title: | Design, deployment and functional tests of the online event filter for the ATLAS experiment at LHC |
| DOI: | 10.1109/TNS.2005.862790 |
| Keywords: | data acquisition, data processing, triggering |
| UCL classification: | UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy |
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