CERN Accelerating science

ATLAS Note
Report number	ATL-DAQ-2003-034
Title	A New Implementation of the Region-of-Interest Strategy for the ATLAS Second Level Trigger
Author(s)	Boisvert, V ; Armstrong, S ; Baines, J T M ; Bee, C P ; Biglietti, M ; Bogaerts, A ; Bosman, M ; Brandt, S ; Caron, B ; Casado, M P ; Cataldi, G ; Cavalli, D ; Cervetto, M ; Comune, G ; Corso-Radu, A ; Di Mattia, A ; Díaz-Gómez, M ; Dos Anjos, A ; Drohan, J ; Ellis, Nick ; Elsing, M ; Epp, B ; Etienne, F ; Falciano, S ; Farilla, A ; George, S ; Ghete, V M ; González, S ; Grothe, M ; Kaczmarska, A ; Karr, K M ; Khomich, A ; Konstantinidis, N P ; Krasny, W ; Li, W ; Lowe, A ; Luminari, L ; Ma, H ; Meessen, C ; Mello, A G ; Merino, G ; Morettini, P ; Moyse, E ; Nairz, A ; Negri, A ; Nikitin, N V ; Nisati, A ; Padilla, C ; Parodi, F ; Pérez-Réale, V (Univ Bern) ; Pinfold, J L ; Pinto, P ; Polesello, G ; Qian, Z ; Rajagopalan, S ; Resconi, S ; Rosati, S ; Scannicchio, D A ; Schiavi, C ; Schörner-Sadenius, T ; Segura, E ; De Seixas, J M ; Shears, T G ; Sivoklokov, S Yu ; Smizanska, M ; Soluk, R A ; Stanescu, C ; Tapprogge, Stefan ; Touchard, F ; Vercesi, V ; Watson, A ; Wengler, T ; Werner, P ; Wheeler, S ; Wickens, F J ; Wiedenmann, W ; Wielers, M ; Zobernig, G
Publication	2003
Imprint	11 Jun 2003
Number of pages	6
In:	2003 Conference for Computing in High-Energy and Nuclear Physics, La Jolla, CA, USA, 24 - 28 Mar 2003
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Region Selector ; Region-of-Interest
Abstract	Among the many challenges presented by the future ATLAS detector at the LHC are the high data taking rate and volume and the derivation of a rapid trigger decis ion with limited resources. To address this challenge within the ATLAS second le vel trigger system, a Region-of-Interest mechanism has been adopted which dramat ically reduces the relevant fiducial volume necessary to be readout and processe d to small regions guided by the hardware-based first level trigger. Software ha s been developed to allow fast translation between arbitrary geometric regions a nd identifiers of small collections of the event data. This facilitates on-deman d data retrieval and collection building. The system is optimized to minimize th e amount of data transferred and unnecessary building of complex objects. Detail s of the design and implementation are presented along with preliminary performance results.
Copyright/License	Preprint: (License: CC-BY-4.0)

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