CERN Accelerating science

ATLAS Slides
Report number	ATL-DAQ-SLIDE-2012-258
Author(s)	Pastore, F
Corporate author(s)	The ATLAS collaboration
Submitted to	12th Pisa Meeting on Advanced Detectors: Frontier Detector for Frontier Physics, La Biodola, Isola d'Elba, Italy, 20 - 26 May 2012
Submitted by	[email protected] on 19 May 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Trigger Upgrade
Abstract	In the coming years different phases of upgrades for the LHC complex are foreseen, which will allow to extend the physics potential of its experiments. Through two different phases (namely phase-1 and phase-2), the average luminosity will be increased by a factor 5-10 above the design luminosity. Consequently, the detectors and the infrastructure of the DAQ system of the experiments will need to be upgraded as well, to take into account the increased radiation level and particle rates foreseen at such high luminosity. In this paper we describe the changes to the ATLAS detector and its trigger system, to face the increased number of interactions per collisions. This will cause higher level of pile-up and increased rates at each level of the trigger. The trigger detectors will improve their selectivity by benefiting from the increased granularity available at the trigger level, which will allow for a higher resolution. The use of the tracking system in the lower levels of the trigger selection is also discussed. For example, the addition of tracking information at the first trigger level during the LHC upgrade phase-2 is currently under discussion. Different scenarios are compared, having in mind the requirements to achieve the expected physics potential of ATLAS in this high luminosity regime.