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 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 A New Implementation of the Region-of-Interest Strategy for the ATLAS Second Level Trigger 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. eng Region Selector; Region-of-Interest; 2003

http://documents.cern.ch/cgi-bin/setlink?base=atlnot&categ=Note&id=daq-2003-034; http://cds.cern.ch/record/685509/files/daq-2003-034.pdf; http://cds.cern.ch/record/685509/files/daq-2003-034.ps.gz; http://www.slac.stanford.edu/econf/C0303241/proc/papers/_vti_cnf/TUGT008.PDF;

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