Speakers
Joannes HALLER
(CERN)
Ralf Spiwoks
(CERN)
Description
The ATLAS detector at CERN's LHC will be exposed to proton-proton
collisions at a rate of 40 MHz. In order to reduce the data rate,
only potentially interesting events are selected by a three-level
trigger system. Its first level is implemented in electronics and
firmware, and aims at reducing the data output rate to about 75
kHz. The second and third trigger levels are based on software
and reduces the rate to about 200 Hz.
To prepare the full trigger chain for the online event selection
according to a certain strategy, a system is being set up that
provides the corresponding information to all parts of the
trigger chain, e.g. values for hardware registers in level-1 or
steering parameters of high-level trigger algorithms. The same
information is used to configure the offline trigger simulation.
In this presentation an overview of the system is given and its
main components are discussed.
Author
Dr
Johannes Haller
(CERN)
Co-author
Dr
Throsten Wengler
(CERN)
