Status of the ATLAS level-1 central trigger and muon barrel trigger and first results from cosmic-ray data

G. Aielli*, A. Aloisio, M. G. Alviggi, S. Antonelli, S. Ask, L. Bellagamba, S. Ben Ami, Y. Benhammou, D. Berge, M. Bianco, M. G. Bigliettii, D. Boscherini, S. Bressler, A. Bruni, G. Bruni, S. Buda, P. Camarri, V. Canales, D. Caracinha, R. CardarelliG. Carlino, G. Chiodini, G. Ciapetti, M. R. Coluccia, S. Constantin, F. Conventi, R. Deasmundis, M. Dellapietra, D. Dellavolpe, M. Dogaru, D. De Pedis, A. Di Girolamo, A. Diciaccio, A. Di Mattia, N. Ellis, E. Etzion, P. Farthouat, C. Fukunaga, P. Gällnö, E. Gorini, F. Grancagnolo, P. Giusti, S. Haas, J. Haller, Y. Hasegawa, G. Iacobucci, M. Ikeno, P. Iengo, M. Ishino, H. Iwasaki, V. Izzo, T. Kadosaka, E. Kajomovitz, N. Kanaya, K. Kawagoe, T. Kawamoto, H. Kiyamura, P. Klofver, T. Kobayashi, T. Kohno, A. Krasznahorkay, T. Kubota, H. Kurashige, T. Kuwabara, D. Lellouch, L. Levinson, B. Liberti, R. Lifshitz, C. Luci, N. Lupu, F. Marchese, A. Messina, G. Mikenberg, A. Migliaccio, K. Nagano, A. Nisati, T. Niwa, M. Nomachi, H. Nomoto, M. Nozakf, A. Ochf, C. Ohm, Y. Okumura, C. Omachi, H. Oshita, S. Patricelli, T. Pauly, M. Perantoni, H. Pessoa Lima Junior, E. Petrolo, E. Pasqualucci, F. Pastore, M. Pectu, R. Perrino, A. Polini, M. Primavera, A. Roich, S. Rosati, A. Salamon, H. Sakamoto, R. Santonico, O. Sasaki, G. Schulen, J. M. De Seixas, G. Sekhniaidze, E. Solfaroli, S. Spagnolo, F. Spila, R. Spiwoks, Y. Sugaya, T. Sugimoto, Y. Takahashi, H. Takeda, T. Takeshita, S. Tanaka, S. Tarem, M. Tomoto, O. Bahat Treidel, R. Vari, S. Veneziano, T. Wengler, D. Y. Yamaguchi, Y. Yasu, L. Zanello

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The ATLAS detector at CERN's Large Hadron Collider (LHC) will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system will select potentially interesting events in order to reduce the read-out 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 central trigger and the muon barrel trigger system and report on the current installation status. Moreover, we show analysis results of cosmicray data recorded in situ at the ATLAS experimental site with final or close-to-final hardware.

Original languageEnglish
Title of host publication2007 15th IEEE-NPSS Real-Time Conference, RT
PublisherIEEE Computer Society
ISBN (Print)1424408679, 9781424408672
StatePublished - 2007
Event2007 15th IEEE-NPSS Real-Time Conference, RT - Batavia, IL, United States
Duration: 29 Apr 20074 May 2007

Publication series

Name2007 15th IEEE-NPSS Real-Time Conference, RT


Conference2007 15th IEEE-NPSS Real-Time Conference, RT
Country/TerritoryUnited States
CityBatavia, IL


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