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Andreani, A; Andreazza, A; Annovi, A; Beretta, M; Bevacqua, V; Bogdan, M; Bossini, E; Boveia, A; Canelli, F; Cheng, Y; Citterio, M; Crescioli, F; Dell'Orso, M; Drake, G; Dunford, M; Genat, J F; Giannetti, P; Giorgi, F; Hoff, J; Kapliy, A; Kasten, M; Kim, Y K; Kimura, N; Lanza, A; Liberali, V; Liu, T; McCarn, A; Melachrinos, C; Meroni, C; Negri, A; Neubauer, M; Piendibene, M; Proudfoot, J; Punzi, G; Riva, M; Sabatini, F; Sacco, I; Sartori, L; Shochet, M; Stabile, A; Tang, F; Todri, A; Tripiccione, R; Tuggle, J; Vercesi, V; Villa, M; Vitullo, R A; Volpi, G; Wu, J; Yorita, K; Zhang, J
Journal of instrumentation, 12/2010, Volume: 5, Issue: 12Journal Article
The existing three-level ATLAS trigger system is deployed to reduce the event rate from the bunch crossing rate of 40 MHz to ~ 200 Hz for permanent storage at the LHC design luminosity of 1034 cm−2 s−1. When the LHC exceeds the design luminosity, the load on the Level-2 trigger system will significantly increase due both to the need for more sophisticated algorithms to suppress background and the larger event sizes. The Fast Tracker is a proposed upgrade to the current ATLAS trigger system that will operate at the full Level-1 accepted rate of 100 kHz and provide high quality tracks at the beginning of processing in the Level-2 trigger, by performing track reconstruction in hardware with massive parallelism of associative memories. The concept design is being advanced and justified with the performance in important physics areas, b-tagging, τ-tagging and lepton isolation. The prototyping with current technology is underway and R&D with new technologies has been started.
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