@article{5552d058b5714aa6b717ee62dd9c689f,
title = "The DAQ/HLT system of the ATLAS experiment",
abstract = "The DAQ/HLT system of the ATLAS experiment at CERN, Switzerland, is being commissioned for first collisions in 2009. Presently, the system is composed of an already very large farm of computers that accounts for about one-third of its final event processing capacity. Event selection is conducted in two steps after the hardware-based Level-1 Trigger: a Level-2 Trigger processes detector data based on regions of interest (RoI) and an Event Filter operates on the full event data assembled by the Event Building system. The detector read out is fully commissioned and can be operated at its full design capacity. This places the responsibility on the High-Level Triggers system to select only events of highest physics interest that will finally reach the offline reconstruction farms. This paper brings an overview of the current ATLAS DAQ/HLT implementation and performance based on studies originated from its operation with simulated, cosmic particles and first-beam data. Its built-in event processing parallelism is presented and discussed.",
author = "{on behalf of the ATLAS TDAQ Community} and {Dos Anjos}, Andr{\'e} and M. Abolins and R. Achenbach and C. Adorisio and P. Adragna and M. Aharrouche and G. Aielli and A. Al-Shabibi and I. Aleksandrov and G. Alexandre and A. Aloisio and Alviggi, {M. G.} and A. Amorim and N. Amram and K. Anderson and V. Andrei and X. Anduaga and S. Antonelli and F. Anulli and I. Aracena and S. Ask and B. {\AA}sman and G. Avolio and S. Backlund and E. Badescu and J. Baines and S. Banerjee and Barnett, {B. M.} and R. Bartoldus and S. Batraneanu and A. Battaglia and B. Bauss and P. Beauchemin and Beck, {H. P.} and C. Bee and P. Behera and P. Bell and Bell, {W. H.} and L. Bellagamba and M. Bellomo and {Ben Ami}, S. and M. Bendel and Y. Benhammou and K. Benslama and D. Berge and N. Berger and C. Bernius and T. Berry and M. Bianco and K. Johns",
note = "Funding Information: 34 Department of Physics, Royal Holloway, University of London, Egham 35 Institut f{\"u}r Physik, Humboldt-Universit{\"a}t zu Berlin 36 I.N.F.N. Bologna 37 I.N.F.N. Lecce 38 I.N.F.N. Napoli 39 I.N.F.N. Pavia 40 Dipartimento di Fisica dell{\textquoteright} Universit{\`a} di Pisa e I.N.F.N., Pisa 41 I.N.F.N. Roma 42 I.N.F.N. Tor Vergata 43 Indiana University, Bloomington, Indiana 44 nstitute for Astro-and Particle Physics, Leopold-Franzens-Universit Innsbruck 45 Iowa State University, Ames, Iowa 46 KEK, High Energy Accelerator Research Organisation, Tsukuba 47 Kobe University, Kobe 48 Laboratoire d{\textquoteright}Annecy-le-Vieux de Physique des Particules (LAPP), IN2P3-CNRS, Annecy-le-Vieux 49 Laboratorio de Instrumenta{\c c}ao e Fisica Experimental, Lisboa 50 Universidad Nacional de La Plata, La Plata 51 Department of Physics, Lancaster University, Lancaster 52 Universit{\`a} degli Studi del Salento, Dipartimento di Fisica, Lecce 53 University Cat{\'o}lica-Figueira da Foz and University Nova de Lisboa, Lisbon 54 University of Liverpool, Liverpool 55 Max-Planck-Institut f{\"u}r Physik, M{\"u}nchen 56 Michigan State University, Department of Physics and Astronomy, East Lansing, Michigan 57 Institut f{\"u}r Physik, Universit{\"a}t Mainz, Mainz 58 School of Physics and Astronomy, University of Manchester, Manchester 59 Centre de Physique des Particules de Marseille, IN2P3-CNRS, Marseille 60 Department of Physics, McGill University, Montreal 61 University of Michigan, Department of Physics, Ann Arbor, Michigan 62 University of Montreal, Montreal 63 Moscow State University, Moscow 64 Niels Bohr Institute, University of Copenhagen, Copenhagen 65 Department of Physics, New York University, New York 66 Nagasaki Institute of Applied Science, Nagasaki 67 Nagoya University, Nagoya 68 Universit{\`a} di Napoli {\textquoteright}Federico II{\textquoteright}, Dipartimento di Scienze Fisiche, Napoli 69 Nikhef National Institute for Subatomic Physics, Amsterdam 70 University of Oregon, Eugene, Oregon 71 Osaka University, Osaka 72 Department of Physics, Oxford University, Oxford 73 Petersburg Nuclear Physics Institute (PNPI), St. Petersburg 74 Universit{\`a} di Pavia, Dipartimento di Fisica Nucleare e Teorica, Pavia 75 Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania Publisher Copyright: {\textcopyright} 2008 Sissa Medialab Srl. All rights reserved.; 12th Advanced Computing and Analysis Techniques in Physics Research, ACAT 2008 ; Conference date: 03-11-2008 Through 07-11-2008",
year = "2008",
language = "English (US)",
volume = "70",
journal = "Proceedings of Science",
issn = "1824-8039",
publisher = "Sissa Medialab Srl",
}