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The ATLAS level-1 trigger: Status of the system and first results from cosmic-ray data

  • G. Aielli
  • , V. Andrei
  • , R. Achenbach
  • , P. Adragna
  • , A. Aloisio
  • , M. G. Alviggi
  • , S. Antonelli
  • , S. Ask
  • , B. M. Barnett
  • , B. Bauss
  • , L. Bellagamba
  • , S. Ben Ami
  • , M. Bendel
  • , Y. Benhammou
  • , D. Berge
  • , M. Bianco
  • , M. G. Biglietti
  • , C. Bohm
  • , J. R A Booth
  • , D. Boscherini
  • I. P. Brawn, S. Bressler, A. Bruni, G. Bruni, S. Buda, P. Camarri, V. Canale, D. Caracinha, R. Cardarelli, G. Carlino, D. G. Charlton, G. Chiodini, G. Ciapetti, M. R. Coluccia, S. Constantin, F. Conventi, C. J. Curtis, R. DeAsmundis, M. DellaPietra, D. DellaVolpe, M. Dogaru, A. O. Davis, D. De Pedis, A. Di Girolamo, A. DiCiaccio, A. Di Mattia, E. Eisenhandler, N. Ellis, E. Etzion, P. Farthouat, P. J W F Faulkner, F. Föhlisch, C. Fukunaga, P. Gällnö, C. N P Gee, C. Geweniger, A. R. Gillman, E. Gorini, F. Grancagnolo, P. Giusti, S. Haas, J. Haller, P. Hanke, Y. Hasegawa, S. Hellman, A. Hidvégi, S. Hillier, G. Iacobucci, M. Ikeno, P. Iengo, M. Ishino, H. Iwasaki, V. Izzo, M. Johansen, T. Kadosaka, E. Kajomovitz, N. Kanaya, K. Kawagoe, T. Kawamoto, H. Kiyamura, P. Klofver, E. E. Kluge, T. Kobayashi, T. Kohno, A. Krasznahorkay, T. Kubota, H. Kurashige, T. Kuwabara, M. Landon, D. Lellouch, V. Lendermann, L. Levinson, B. Liberti, R. Lifshitz, C. Luci, N. Lupu, K. Mahboubi, G. Mahout, F. Marchese, K. Meier, G. Mikenberg, A. Migliaccio, K. Nagano, A. Nisati, T. Niwa, M. Nomachi, H. Nomoto, M. Nozaki, A. Ochi, C. Ohm, Y. Okumura, C. Omachi, H. Oshita, S. Patricelli, T. Pauly, M. Perantoni, H. Pessoa Lima, E. Petrolo, E. Pasqualucci, F. Pastore, M. Pectu, V. J O Perera, R. Perrino, A. Polini, D. P F Prieur, M. Primavera, W. Qian, S. Rieke, A. Roich, S. Rosati, F. Rühr, A. Salamon, H. Sakamoto, D. P C Sankey, R. Santonico, O. Sasaki, U. Schäfer, K. Schmitt, G. Schuler, H. C. Schultz-Coulon, J. M. de Seixas, G. Sekhniaidze, S. Silverstein, E. Solfaroli, S. Spagnolo, F. Spila, R. Spiwoks, R. J. Staley, R. Stamen, Y. Sugaya, T. Sugimoto, Y. Takahashi, H. Takeda, T. Takeshita, S. Tanaka, S. Tapprogge, S. Tarem, J. P. Thomas, M. Tomoto, O. Bahat Treidel, T. Trefzger, R. Vari, S. Veneziano, P. M. Watkins, A. Watson, P. Weber, T. Wengler, E. E. Woehrling, Y. Yamaguchi, Y. Yasu, L. Zanello

    Research output: Contribution to journalArticlepeer-review

    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 readout 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. © 2007 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)476-481
    Number of pages5
    JournalNuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
    Volume581
    Issue number1-2
    DOIs
    Publication statusPublished - 21 Oct 2007

    Keywords

    • ATLAS
    • Cosmic-ray data
    • Installation and commissioning
    • Trigger system

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