Author :
Aielli, G. ; Aloisio, A. ; Alviggi, M.G. ; Antonelli, S. ; Ask, S. ; Bellagamba, L. ; Ami, S. Ben ; Benhammou, Y. ; Berge, David ; Bianco, M. ; Biglietti, M.G. ; Boscherini, D. ; Bressler, S. ; Bruni, A. ; Bruni, G. ; Buda, S. ; Camarri, P. ; Canale, V. ;
Abstract :
The ATLAS detector at CERN´s Large Hadron Collider (LHC) will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system will select potentially interesting events in order to reduce the read-out rate to about 200 Hz. The first trigger level is implemented in custom-built electronics and makes an initial fast selection based on detector data of coarse granularity. It has to reduce the rate by a factor of to less than 100 kHz. The other two consecutive trigger levels are in software and run on PC farms. We present an overview of the first-level central trigger and the muon barrel trigger system and report on the current installation status. Moreover, we show analysis results of cosmic-ray data recorded in situ at the ATLAS experimental site with final or close-to-final hardware.
Keywords :
position sensitive particle detectors; readout electronics; trigger circuits; ATLAS detector; CERN; Large Hadron Collider; cosmic-ray data; custom-built electronics; level-1 central trigger; muon barrel trigger; proton-proton collisions; read-out rate; three-level trigger system; Ambient intelligence; Colliding beam devices; Detectors; Event detection; Hardware; Irrigation; Large Hadron Collider; Mesons; Particle beams; Physics; Data acquisition; real time systems; triggering;
