Speaker
Mr
Thilo Pauly
(European Organization for Nuclear Research (CERN))
Description
The ATLAS detector at CERN's LHC will be exposed to proton-proton
collisions at a bunch-crossing rate of 40 MHz. In order to reduce the
data rate, a three-level trigger system selects potentially
interesting events. Its first level is implemented in electronics and
firmware, and aims at reducing the output rate to under 100 kHz. The
Central Trigger Processor (CTP) combines information from the
calorimeter and muon trigger processors, and makes the final Level-1
Accept (L1A) decision.
The CTP is a central element in the timing setup of the experiment.
Several strategies are presented for timing-in the experiment, which
is done with respect to the Level-1 trigger, with respect to the
experiment, and with respect to the world.
Furthermore, the monitoring of the Level-1 trigger is described. As
trigger rates are very sensitive to beam conditions (luminosity,
backgrounds) and detector performance (e.g. noisy cells), the Level-1
trigger needs to be carefully monitored, which guarantees correct
functioning of the Level-1 trigger system and is vital for correct
and meaningful data taking.
Author
Mr
Thilo Pauly
(European Organization for Nuclear Research (CERN))
Co-authors
Attila Krasznahorkay
(European Organization for Nuclear Research (CERN))
Georges Schuler
(European Organization for Nuclear Research (CERN))
Herman Pessoa Lima Junior
(University of Rio de Janeiro, Rio de Janeiro, Brazil)
Ivan Resurreccion Arcas
(University of Rio de Janeiro, Rio de Janeiro, Brazil)
Johannes Haller
(European Organization for Nuclear Research (CERN))
Jose de Seixas
(University of Rio de Janeiro, Rio de Janeiro, Brazil)
Nick Ellis
(European Organization for Nuclear Research (CERN))
Pedro Borrego Amaral
(European Organization for Nuclear Research (CERN))
Per Gallno
(European Organization for Nuclear Research (CERN))
Philippe Farthouat
(European Organization for Nuclear Research (CERN))
Ralf Spiwoks
(European Organization for Nuclear Research (CERN))
Rui Torga Teixeira
(European Organization for Nuclear Research (CERN))
Tadashi Maeno
(European Organization for Nuclear Research (CERN))
Thorsten Wengler
(European Organization for Nuclear Research (CERN))
