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Title: L1 track triggers for ATLAS in the HL-LHC

The HL-LHC, the planned high luminosity upgrade for the LHC, will increase the collision rate in the ATLAS detector approximately a factor of 5 beyond the luminosity for which the detectors were designed, while also increasing the number of pile-up collisions in each event by a similar factor. This means that the level-1 trigger must achieve a higher rejection factor in a more difficult environment. This presentation discusses the challenges that arise in this environment and strategies being considered by ATLAS to include information from the tracking systems in the level-1 decision. The main challenges involve reducing the data volume exported from the tracking system for which two options are under consideration: a region of interest based system and an intelligent sensor method which filters on hits likely to come from higher transverse momentum tracks.
Authors:
 [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
Publication Date:
OSTI Identifier:
1196793
Grant/Contract Number:
FG02-95ER40893
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 7; Journal Issue: 01; Conference: Topical Workshop on Electronics for Particle Physics 2011, Vienna (Austria), 26-30 Sep 2011; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
University of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
ATLAS
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS trigger concepts and systems (hardware and software); online farms and online filtering; trigger algorithms; front-end electronics for detector readout