Status of the ATLAS Level-1 Central Trigger and Muon Barrel Trigger and First Results from Cosmic-Ray Data

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 implemente...

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Published in:	IEEE transactions on nuclear science Vol. 55; no. 1; pp. 139 - 144
Main Authors:	Aielli, G., Antonelli, S., Ask, S., Bellagamba, L., Ben Amii, S., Benhammou, Y., Berge, D., Bianco, M., Biglietti, M.G., Bressler, S., Bruni, G., Buda, S., Camarri, P., Canale, V., Caracinha, D., Cardarelli, R., Carlino, G., Chiodini, G., Constantin, S., Conventi, F., Della Pietra, M., Della Volpe, D., Dogaru, M., De Pedis, D., Di Girolamo, A., DiCiaccio, A., Di Mattia, A., Etzion, E., Farthouat, P., Fukunaga, C., Gallno, P., Gorini, E., Grancagnolo, F., Haller, J., Hasegawa, Y., Ikeno, M., Iengo, P., Ishino, M., Iwasaki, H., Kadosaka, T., Kajomovitz, E., Kanaya, N., Kawagoe, K., Kiyamura, H., Klofver, P., Kobayashi, T., Kohno, T., Krasznahorkay, A., Kubota, T., Kurashige, H., Kuwabara, T., Lellouch, D., Levinson, L., Liberti, B., Luci, C., Lupu, N., Marchese, F., Messina, A., Mikenberg, G., Migliaccio, A., Niwa, T., Nomachi, M., Nomoto, H., Nozaki, M., Ochi, A., Ohm, C., Omachi, C., Oshita, H., Patricelli, S., Perantoni, M., Lima, H.P., Petrolo, E., Pasqualucci, E., Pectu, M., Perrino, R., Primavera, M., Rosati, S., Salamon, A., Sakamoto, H., Santonico, R., Sasaki, O., Schuler, G., de Seixas, J.M., Sekhniaidze, G., Solfaroli, E., Spagnolo, S., Spila, F., Spiwoks, R., Sugaya, Y., Sugimoto, T., Takahashi, Y., Takeda, H., Takeshita, T., Tanaka, S., Tomoto, M., Treidel, O.B., Vari, R., Veneziano, S., Yasu, Y., Zanello, L.
Format:	Journal Article
Language:	English
Published:	New York IEEE 2008 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Ambient intelligence Beams (radiation) Colliding beam devices Computer programs Data acquisition Detectors Electronics Event detection Farms Hadrons Hardware Irrigation Large Hadron Collider Mesons Muons Particle beams Physics real time systems triggering
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Summary:	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 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 cosmic-ray data recorded in situ at the ATLAS experimental site with final or close-to-final hardware.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0018-9499 1558-1578
DOI:	10.1109/TNS.2007.910676