The first-level trigger of ATLAS

Haller, Johannes; Pasqualucci, E; Hasegawa, Y; Brawn, I P; Watson, A; Hanke, P; Schultz-Coulon, H C; Kurashige, H; Patricelli, S; Takeda, H; Gillman, A R; Chiodi, G; Krasznahorkay, A; Sugaya, Y; De Seixas, J M; Eisenhandler, E F; Nisati, A; Kagawa, S; Haas, S; Bressler, S; Weber, G A; Grancagnolo, F; Conventi, F; Santonico, R; Kluge, E -E; Salamon, A; Levinson, L; Canale, V; Schäfer, U; Harel, A; Edwards, J; Schuler, G; Buda, S; Pastore, F; Petrolo, E; Gällnö, P; Yamaguchi, Y; Tanaka, S; Ikeno, M; Mikenberg, G; Caracinha, D; Kanaya, N; Aielli, G; Ochi, A; Vari, R; Pessoa-Lima, H; Yasu, Y; Nozaki, M; Etzion, E; Tapprogge, S; Bartos, D; Qian, W; Cataldi, G; Spila, F; Perrino, R; Belkin, A; Bauss, B; Carlino, G; Bohm, C; Hillier, S J; Silverstein, S; Di Girolamo, A; Lifshitz, R; Rusu, A; Veneziano, Stefano; Pectu, M; Fukunaga, C; Ichimiya, R; Achenbach, R; Booth, J R A; Perera, V J O; Trefzger, T; Woerling, E E; Di Ciaccio, A; Davis, A O; Magureanu, C; Ask, S; Lupu, N; Kiyamura, H; De Asmundis, R; Barnett, B M; Omachi, C; Iengo, P; Ellis, Nick; Gennari, E; Sasaki, O; Della Volpe, D; Charlton, D G; Sankey, D P C; Perantoni, M; Cardarelli, R; Alviggi, M G; Benhammou, Ya; Weber, P; Spiwoks, R; Nagano, K; Staley, R J; De Pedis, D; Ciapetti, G; Ishino, M; Brambilla, Elena; Primavera, M; Lellouch, D; Ogata, T; Izzo, V; Oshita, H; Di Simone, A; Nomachi, M; Geweniger, C; Della Pietra, M; Moye, T H; Rieke, S; Rühr, F; Meier, K; Tarem, S; Mirea, A; Dogaru, M; Sakamoto, H; Uroseviteanu, C; Constantin, S; Luci, C; Typaldos, D; Thomas, J P; Takeshita, T; Bocci, V; Gee, C N P; Migliaccio, A; Hellman, S; Aloisio, A; Spagnolo, S; Watkins, P M; Pauly, T; Landon, M; Iwasaki, H; Farthouat, P; Föhlisch, F; Nomoto, H; Distante, L; Di Mattia, A; Gorini, E; Kawamoto, T; Kawagoe, K; Prodan, L; Zanello, L; Sekhniaidze, G; Schmitt, K; Aprodu, V; Kobayashi, T; Sugimoto, T; Kuwabara, T; Mahout, G; Hidvegi, A; Wengler, T; Mahboubi, K

doi:10.22323/1.021.0391

ATLAS Note
Report number	physics/0512195 ; ATL-DAQ-PUB-2006-001 ; ATL-COM-DAQ-2005-043
Title	The first-level trigger of ATLAS
Related title	A TOROIDAL LHC APPARATUS LARGE HADRON COLLIDER FIRST LEVEL
Author(s)	Haller, Johannes (CERN) ; Achenbach, R ; Aielli, G ; Aloisio, A ; Alviggi, M G ; Aprodu, V ; Ask, S ; Barnett, B M ; Bartos, D ; Bauss, B ; Belkin, A ; Benhammou, Ya ; Bocci, V ; Booth, J R A ; Brambilla, Elena ; Brawn, I P ; Bressler, S ; Buda, S ; Bohm, C ; Canale, V ; Caracinha, D ; Cardarelli, R ; Carlino, G ; Cataldi, G ; Charlton, D G ; Chiodi, G ; Ciapetti, G ; Constantin, S ; Conventi, F ; Davis, A O ; De Asmundis, R ; De Pedis, D ; De Seixas, J M ; Della Pietra, M ; Della Volpe, D ; Di Ciaccio, A ; Di Girolamo, A ; Di Mattia, A ; Di Simone, A ; Distante, L ; Dogaru, M ; Edwards, J ; Eisenhandler, E F ; Ellis, Nick ; Etzion, E ; Farthouat, P ; Fukunaga, C ; Föhlisch, F ; Gee, C N P ; Gennari, E ; Geweniger, C ; Gillman, A R ; Gorini, E ; Grancagnolo, F ; Gällnö, P ; Haas, S ; Hanke, P ; Harel, A ; Hasegawa, Y ; Hellman, S ; Hidvegi, A ; Hillier, S J ; Ichimiya, R ; Iengo, P ; Ikeno, M ; Ishino, M ; Iwasaki, H ; Izzo, V ; Kagawa, S ; Kanaya, N ; Kawagoe, K ; Kawamoto, T ; Kiyamura, H ; Kluge, E -E ; Kobayashi, T ; Krasznahorkay, A ; Kurashige, H ; Kuwabara, T ; Landon, M ; Lellouch, D ; Levinson, L ; Lifshitz, R ; Luci, C ; Lupu, N ; Magureanu, C ; Mahboubi, K ; Mahout, G ; Meier, K ; Migliaccio, A (University of Napoli, Frederico II, and INFN Napoli) ; Mikenberg, G ; Mirea, A ; Moye, T H ; Nagano, K ; Nisati, A ; Nomachi, M ; Nomoto, H ; Nozaki, M ; Ochi, A ; Ogata, T ; Omachi, C ; Oshita, H ; Pasqualucci, E ; Pastore, F ; Patricelli, S ; Pauly, T ; Pectu, M ; Perantoni, M ; Perera, V J O ; Perrino, R ; Pessoa-Lima, H ; Petrolo, E ; Primavera, M ; Prodan, L ; Qian, W ; Rieke, S ; Rusu, A ; Rühr, F ; Sakamoto, H ; Salamon, A ; Sankey, D P C ; Santonico, R ; Sasaki, O ; Schmitt, K ; Schuler, G ; Schultz-Coulon, H C ; Schäfer, U ; Sekhniaidze, G ; Silverstein, S ; Spagnolo, S ; Spila, F ; Spiwoks, R ; Staley, R J ; Sugaya, Y ; Sugimoto, T ; Takeda, H ; Takeshita, T ; Tanaka, S ; Tapprogge, S ; Tarem, S ; Thomas, J P ; Trefzger, T ; Typaldos, D ; Uroseviteanu, C ; Vari, R ; Veneziano, Stefano ; Watkins, P M ; Watson, A ; Weber, G A ; Weber, P ; Wengler, T ; Woerling, E E ; Yamaguchi, Y ; Yasu, Y ; Zanello, L
Collaboration	for the ATLAS TDAQ LVL1 Group
Publication	2006
Imprint	30 Nov 2005
Number of pages	4
Note	Presented at the 2005 International Europhysics Conference on High Energy Physics (EPS2005), Lisbon, Portugal, July 2005
In:	PoS HEP2005 (2006) pp.391
In:	International Europhysics Conference on High-Energy Physics, Lisbon, Portugal, 21 - 27 Jul 2005, pp.391
DOI	10.22323/1.021.0391
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ATLAS ; LVL1 ; first level ; test beam ; testbeam ; trigger
Abstract	Due to the huge interaction rates and the tough experimental environment of pp collisions at a centre-of-mass energy sqrt(s)=14TeV and luminosities of up to 10^34 cm^-2 s^-1, one of the experimental challenges at the LHC is the triggering of interesting events. In the ATLAS experiment a three-level trigger system is foreseen for this purpose. The first-level trigger is implemented in custom hardware and has been designed to reduce the data rate from the initial bunch-crossing rate of 40 MHz to around 75 kHz. Its event selection is based on information from the calorimeters and dedicated muon detectors. This article gives an overview over the full first-level trigger system including the Calorimeter Trigger, the Muon Trigger and the Central Trigger Processor. In addition, recent results are reported that have been obtained from test-beam studies performed at CERN where the full first-level trigger chain was established successfully for the first time and used to trigger the read-out of up to nine ATLAS sub-detector systems.
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