CERN Accelerating science

ATLAS Slides
Report number	ATL-DAQ-SLIDE-2016-471
Title	The design of a fast Level-1 track trigger for the high luminosity upgrade of ATLAS.
Author(s)	Gradin, Per Olov Joakim (Laboratoire de Physique Subatomique et de Cosmologie de Grenoble (LPSC)) ; ATLAS Collaboration
Corporate author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Submitted to	4th Conference on Large Hadron Collider Physics 2016 (LHCP 2016), Lund, Sweden, 13 - 18 Jun 2016
Submitted by	per.olov.joakim.gradin@cern.ch on 12 Aug 2016
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	L1Track ; Trigger ; Tracking
Abstract	The high/luminosity upgrade of the LHC will increase the rate of the proton-proton collisions by approximately a factor of 5 with respect to the initial LHC-design. The ATLAS experiment will upgrade consequently, increasing its robustness and selectivity in the expected high radiation environment. In particular, the earliest, hardware based, ATLAS trigger stage ("Level 1") will require higher rejection power, still maintaining efficient selection on many various physics signatures. The key ingredient is the possibility of extracting tracking information from the brand new full-silicon detector and use it for the process. While fascinating, this solution poses a big challenge in the choice of the architecture, due to the reduced latency available at this trigger level (few tens of micro-seconds) and the high expected working rates (order of MHz). In this paper, we review the design possibilities of such a system in a potential new trigger and readout architecture, and present the performance resulting from a detailed simulation of possible hardware-based algorithms, to be implemented in the context of Associative Memories and FPGA technologies, as foreseen by R&D plans on these devices.