The ATLAS Level-1 Trigger: Status of the System and First Results from Cosmic-Ray Data
Abstract
The ATLAS detector at CERN's Large Hadron Collider (LHC) will be exposed to proton-proton collisions from beams crossing at 40 MHz. At the design luminosity of 10^34 cm^-2 s^-1 there are on average 23 collisions per bunch crossing. 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 10^4 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 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.
Cite
@article{arxiv.0707.4122,
title = {The ATLAS Level-1 Trigger: Status of the System and First Results from Cosmic-Ray Data},
author = {David Berge},
journal= {arXiv preprint arXiv:0707.4122},
year = {2014}
}
Comments
Contribution to the 11th Vienna Conference on Instrumentation (2007), 12 pages, 6 figures, accepted for publication in the proceedings in NIM A