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1. ATLAS TileCal Read-Out Driver System Production and Initial Performance Results.

Author

Poveda, J., Abdallah, J., Castillo, V., Cuenca, C., Ferrer, A., Fullana, E., González, V., Higón, E., Ruiz-Martínez, A., Salvachúa, B., Sanchis, E., Solans, C., Torres, J., Valero, A., and Valls, J. A.

Subjects
*CALORIMETERS, *DETECTORS, *HADRON colliders, *DIGITAL signal processing, *ALGORITHMS, *MUONS
Abstract

The ATLAS Hadronic Tile Calorimeter detector (TileCal) is an iron-scintillating tiles sampling calorimeter de- signed to operate at the Large Hadron Collider accelerator at CERN. The central element of the back-end system of the TileCal detector is a 9U VME Read-Out Driver (ROD) board. The operation of the TileCal calorimeter requires a total of 32 ROD boards. This paper summarizes the tests performed during the ROD production and the results obtained. Data processing is performed in the ROD by digital signal processors, whose operation is based on the use of online algorithms such as the optimal filtering algorithm for the signal amplitude, pedestal and time reconstruction and the online Muon tagging algorithm which identifies low transverse momentum muons. The initial performance of both algorithms run during commissioning is also presented in this paper. [ABSTRACT FROM AUTHOR]

Published
2007
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2. Design, deployment and functional tests of the online event filter for the ATLAS experiment at LHC.

Author

Armstrong, S., Anjos, A. dos, Baines, J. T. M., Bee, C. P., Biglietti, M., Bogaerts, J. A., Boisvert, V., Bosman, M., Caron, B., Casado, P., Cataldi, G., Cavalli, D., Cervetto, M., Comune, G., Muino, P. Conde, De Santo, A., Gomez, M. Diaz, Dosil, M., Ellis, N., and Emeliyanov, D.

Subjects
*INFORMATION storage & retrieval systems, *ELECTRONIC data processing, *COMPUTER architecture, *ALGORITHMS, *LARGE Hadron Collider
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 [ABSTRACT FROM PUBLISHER]

Published
2005
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