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

Author

Gabriele Chiodini, Thomas Trefzger, Hans-Christian Schultz-Coulon, F.C. Pastore, Gianpaolo Carlino, Barbara Liberti, T. Sugimoto, M. Dogaru, S. Patricelli, A. R. Gillman, Stephen Hillier, A. Di Mattia, J. R.A. Booth, D. Boscherini, N. Kanaya, T. Niwa, N. Lupu, A. Salamon, M. Bendel, P. Gallno, D. De Pedis, Yorito Yamaguchi, Uli Schäfer, Claudio Luci, Kunihiro Nagano, Enrico Pasqualucci, Paolo Iengo, Vincenzo Izzo, V. Lendermann, S. Ask, E. E. Woehrling, B. Bauss, P. M. Watkins, P. Adragna, Alan Watson, C. J. Curtis, David Berge, Kiyotomo Kawagoe, F. Grancagnolo, O. Bahat Treidel, S. Constantin, T. Kobayashi, H. Pessoa Lima, D. DellaVolpe, Yoji Hasegawa, S. Bressler, M. Biglietti, Yasuyuki Okumura, Stefano Veneziano, M. Perantoni, D. P. F. Prieur, Nicolas Ellis, Johannes Haller, Hiroyuki Iwasaki, R. Santonico, L. Zanello, Erez Etzion, S. I. Buda, T. Kadosaka, R. DeAsmundis, A. Roich, G. Ciapetti, R. Perrino, Tohru Takeshita, G. Mahout, D. Caracinha, Anna Rita Migliaccio, Shlomit Tarem, R. Achenbach, A.O. Davis, A. Hidvegi, Samuel Silverstein, V.J.O. Perera, Paolo Camarri, Stefan Tapprogge, H. Oshita, Giulio Aielli, F. Spila, H. Takeda, Yuta Takahashi, I.P. Brawn, Masaya Ishino, H. Kiyamura, R. Lifshitz, E. Eisenhandler, Vincenzo Canale, Enrique Kajomovitz, Yorihito Sugaya, Francesco Conventi, Paul Hanke, Lorne Levinson, Emilio Petrolo, Aleandro Nisati, C. N. P. Gee, M.R. Coluccia, K. Mahboubi, M. Johansen, Stefania Spagnolo, Giora Mikenberg, H. Nomoto, S. Antonelli, Thilo Pauly, Hiroshi Sakamoto, T. Kohno, Michele Bianco, T. Kawamoto, Rainer Stamen, F. Föhlisch, Roberto Cardarelli, A. Polini, Daniel Lellouch, Alberto Aloisio, P. Klofver, J. P. Thomas, Murrough Landon, M. DellaPietra, A. DiCiaccio, T. Kuwabara, C. Omachi, W. Qian, Riccardo Vari, Margherita Primavera, Mitsuaki Nozaki, Osamu Sasaki, P.J.W. Faulkner, K. Meier, Attila Krasznahorkay, Chikara Fukunaga, Mariagrazia Alviggi, F. Marchese, C. Geweniger, R.J. Staley, Masahiro Ikeno, Dave Charlton, E. E. Kluge, Sten Hellman, A. Di Girolamo, R. Spiwoks, V. Andrei, Masaharu Nomachi, P. Giusti, Makoto Tomoto, P. Weber, A. Bruni, Christian Ohm, Y. Benhammou, Satoshi Tanaka, M. Pectu, Edoardo Gorini, Givi Sekhniaidze, K. Schmitt, Frederik Rühr, L. Bellagamba, C. Bohm, Takashi Kubota, S. Haas, G. Schuler, Hisaya Kurashige, Yoshiji Yasu, Atsuhiko Ochi, G. Bruni, Dave Sankey, S. Rieke, P. Farthouat, Bruce Barnett, S. Ben Ami, Stefano Rosati, J.M. de Seixas, E. Solfaroli, Thorsten Wengler, Giuseppe Iacobucci, Aielli, G, Andrei, V, Achenbach, R, Bianco, Michele, Primavera, Margherita, Spagnolo, Stefania Antonia, Gorini, Edoardo, G., Aielli, V., Andrei, R., Achenbach, P., Adragna, Aloisio, Alberto, Alviggi, Mariagrazia, S., Antonelli, S., Ask, B., Barnett, B., Bau, Canale, Vincenzo, DELLA VOLPE, Domenico, and Patricelli, Sergio

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Atlas detector, atlas, cosmic-ray data, installation and commissioning, trigger system, FOS: Physical sciences, Cosmic ray, Nuclear physics, Software, Atlas (anatomy), medicine, Detectors and Experimental Techniques, Instrumentation, Physics, Large Hadron Collider, Luminosity (scattering theory), business.industry, Settore FIS/01 - Fisica Sperimentale, Detector, Instrumentation and Detectors (physics.ins-det), medicine.anatomical_structure, Physics::Accelerator Physics, Granularity, business
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 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 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., Contribution to the 11th Vienna Conference on Instrumentation (2007), 12 pages, 6 figures, accepted for publication in the proceedings in NIM A

Published
2007
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2. Status of the ATLAS level-1 central trigger and muon barrel trigger and first results from cosmic-ray data

Author

Johannes Haller, Andrea Messina, Daniel Lellouch, Paolo Camarri, Stefano Veneziano, P. Gallno, Paolo Iengo, Yasuyuki Okumura, Masaharu Nomachi, G. Schuler, Stefania Spagnolo, Alberto Aloisio, Hisaya Kurashige, F. Spila, D. De Pedis, Roberto Perrino, H. Nomoto, Giuseppe Iacobucci, Tohru Takeshita, R. Santonico, A. Bruni, Erez Etzion, Shlomit Tarem, R. Lifshitz, Anna Rita Migliaccio, P. Klofver, H. Oshita, F. Grancagnolo, T. Kuwabara, O.B. Treidel, M. Biglietti, Margherita Primavera, S. Tanaka, G. Aielli, M. Della Pietra, Attila Krasznahorkay, S. Ask, P. Farthouat, Vincenzo Izzo, Hiroshi Sakamoto, M. Perantoni, Hiroyuki Iwasaki, H. Takeda, Enrique Kajomovitz, Masahiro Ikeno, S. Antonelli, D. della Volpe, Stefano Rosati, J.M. de Seixas, T. Kobayashi, Vincenzo Canale, Roberto Cardarelli, M.R. Coluccia, Yorihito Sugaya, Michele Bianco, C. Omachi, Givi Sekhniaidze, Mitsuaki Nozaki, Emilio Petrolo, Osamu Sasaki, E. Solfaroli, T. Kawamoto, Thilo Pauly, Thorsten Wengler, T. Kohno, P. Giusti, Gabriele Chiodini, Takashi Kubota, Mariagrazia Alviggi, Yoshiji Yasu, Makoto Tomoto, Barbara Liberti, G. Mikenberg, S. I. Buda, T. Sugimoto, S. Ben Amii, S. Haas, S. Patricelli, R. de Asmundis, Gianpaolo Carlino, A. Salamon, T. Niwa, G. Bruni, Lorne Levinson, Chikara Fukunaga, M. Dogaru, Enrico Pasqualucci, A. DiCiaccio, S. Constantin, Yuta Takahashi, H.P. Lima, Riccardo Vari, N. Lupu, Nicolas Ellis, Y. Benhammou, F.C. Pastore, A. Di Mattia, D. Boscherini, Francesco Conventi, M. Pectu, Edoardo Gorini, Kiyotomo Kawagoe, T. Kadosaka, Masaya Ishino, A. Di Girolamo, R. Spiwoks, H. Kiyamura, L. Bellagamba, Yohei Yamaguchi, Yoji Hasegawa, L. Zanello, Shikma Bressler, F. Marchese, Aleandro Nisati, Christian Ohm, Atsuhiko Ochi, Claudio Luci, Kunihiro Nagano, Alessandro Polini, David Berge, A. Roich, G. Ciapetti, N. Kanaya, D. Caracinha, Aielli, G, Aloisio, A, Alviggi, Mg, Antonelli, S, Ask, S, Bellagamba, L, BEN AMI, S, Benhammou, Y, Berge, D, Bianco, Michele, Biglietti, Mg, Boscherini, D, Bressler, S, Bruni, A, Bruni, G, Buda, S, Camarri, P, Canale, V, Caracinha, D, Cardarelli, R, Carlino, G, Chiodini, G, Ciapetti, G, Coluccia, Mr, Constantin, S, Conventi, F, Deasmundis, R, Dellapietra, M, Dellavolpe, D, Dogaru, M, DE PEDIS, D, DI GIROLAMO, A, Diciaccio, A, DI MATTIA, A, Ellis, N, Etzion, E, Farthouat, P, Fukunaga, C, Gallno, P, Gorini, Edoardo, Grancagnolo, F, Giusti, P, Haas, S, Haller, J, Hasegawa, Y, Iacobucci, G, Ikeno, M, Iengo, P, Ishino, M, Iwasaki, H, Izzo, V, Kadosaka, T, Kajomovitz, E, Kanaya, N, Kawagoe, K, Kawamoto, T, Kiyamura, H, Klofver, P, Kobayashi, T, Kohno, T, Krasznahorkay, A, Kubota, T, Kurashige, H, Kuwabara, T, Lellouch, D, Levinson, L, Liberti, B, Lifshitz, R, Luci, C, Lupu, N, Marchese, F, Messina, A, Mikenberg, G, Migliaccio, A, Nagano, K, Nisati, A, Niwa, T, Nomachi, M, Nomoto, H, Nozaki, M, Ochi, A, Ohm, C, Okumura, Y, Omachi, C, Oshita, H, Patricelli, S, Pauly, T, Perantoni, M, Lima, Hp, Petrolo, E, Pasqualucci, E, Pastore, F, Pectu, M, Perrino, R, Polini, A, Primavera, Margherita, Roich, A, Rosati, S, Salamon, A, Sakamoto, H, Santonico, R, Sasaki, O, Schuler, G, DE SEIXAS, Jm, Sekhniaidze, G, Solfaroli, E, Spagnolo, Stefania Antonia, Spila, F, Spiwoks, R, Sugaya, Y, Sugimoto, T, Takahashi, Y, Takeda, H, Takeshita, T, Tanaka, S, Tarem, S, Tomoto, M, Treidel, Ob, Vari, R, Veneziano, S, Wengler, T, Yamaguchi, Y, Yasu, Y, Zanello, L., G., Aielli, Aloisio, Alberto, Alviggi, Mariagrazia, S., Antonelli, S., Ask, L., Bellagamba, S., Ben Ami, Y., Benhammou, David, Berge, M., Bianco, M. G., Biglietti, D., Boscherini, S., Bressler, A., Bruni, G., Bruni, S., Buda, P., Camarri, Canale, Vincenzo, D., Caracinha, R., Cardarelli, G., Carlino, G., Chiodini, G., Ciapetti, M. R., Coluccia, S., Constantin, F., Conventi, R., Deasmundi, DELLA PIETRA, Massimo, DELLA VOLPE, Domenico, M., Dogaru, D., De Pedi, A., Di Girolamo, A., Diciaccio, A., Di Mattia, N., Elli, E., Etzion, P., Farthouat, C., Fukunaga, P., Gallno, E., Gorini, F., Grancagnolo, P., Giusti, S., Haa, 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., 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, R., Perrino, A., Polini, M., Primavera, A., Roich, S., Rosati, A., Salamon, H., Sakamoto, R., Santonico, O., Sasaki, G., Schuler, J. M., de Seixa, G., Sekhniaidze, E., Solfaroli, S., Spagnolo, F., Spila, R., Spiwok, 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, Y., Yamaguchi, Y., Yasu, and L., Zanello

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Muon, Physics::Instrumentation and Detectors, business.industry, Settore FIS/01 - Fisica Sperimentale, Detector, Barrel (horology), Cosmic ray, Nuclear physics, Data acquisition, medicine.anatomical_structure, Nuclear Energy and Engineering, Atlas (anatomy), Nuclear electronics, medicine, Physics::Accelerator Physics, Electrical and Electronic Engineering, business, Computer hardware
Abstract

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 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 104 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.

Published
2008

3. The ATLAS central level-1 trigger logic and TTC system

Author

D. Caracinha, Christian Ohm, Attila Krasznahorkay, P. Klofver, H Pessoa Lima Junior, Thorsten Wengler, P Borrego-Amaral, P. Gallno, R. Spiwoks, Nicolas Ellis, David James Sherman, P. Farthouat, David Berge, Johannes Haller, T. Pauly, S. Ask, G. Schuler, M. Perantoni, J.M. de Seixas, S. Haas, R. Torga Teixeira, and Andrea Messina

Subjects
Physics::Instrumentation and Detectors, business.industry, Computer science, Interface (computing), ATLAS experiment, Electrical engineering, Readout electronics, Modular design, medicine.anatomical_structure, Atlas (anatomy), medicine, ddc:610, business, Instrumentation, Mathematical Physics, Computer hardware
Abstract

The ATLAS central level-1 trigger logic consists in the Central Trigger Processor and the interface to the detector-specific muon level-1 trigger electronics. It is responsible for forming a level-1 trigger in the ATLAS experiment. The distribution of the timing, trigger and control information from the central trigger processor to the readout electronics of the ATLAS subdetectors is done with the TTC system. Both systems are presented.

Published
2008
Full Text
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4. The first-level trigger of ATLAS

Author

Johannes Haller, R. Achenbach, Giulio Aielli, A. Aloisio, M. G. Alviggi, V. Aprodu, S. Ask, B.M. Barnett, D. Bartos, B. Bauss, A. Belkin, Yan Benhammou, V. Bocci, C. Bohm, J.R.A. Booth, E. Brambilla, I.P. Brawn, S. Bressler, S. Buda, V. Canale, D. Caracinha, Roberto Cardarelli, Gianpaolo Carlino, G. Cataldi, D. G. Charlton, G. Chiodi, G. Ciapetti, S. Constantin, Francesco Conventi, A.O. Davis, D. De Pedis, Jose DE SEIXAS, R. DeAsmundis, M. DellaPietra, Domenico Della Volpe, A. Di Girolamo, A. Di Mattia, Anna Di Ciaccio, A. Di Simone, L. Distante, M. Dogaru, J. Edwards, E. Eisenhandler, N. Ellis, E. Etzion, P. Farthouat, F. Föhlisch, C. Fukunaga, P. Gallno, C.N.P. Gee, E. Gennari, C. Geweniger, A. R. Gillman, E. Gorini, Sergio Grancagnolo, S. Haas, P. Hanke, A. Harel, Y. Hasegawa, S. Hellman, A. Hidvégi, S.J. Hillier, R. Ichimiya, Paolo Iengo, M. Ikeno, M. Ishino, H. Iwasaki, V. Izzo, S. Kagawa, N. Kanaya, K. Kawagoe, T. Kawamoto, H. Kiyamura, E.-E. Kluge, T. Kobayashi, A. Krasznahorkay, H. Kurashige, T. Kuwabara, M. Landon, D. Lellouch, L. Levinson, R. Lifshitz, C. Luci, N. Lupu, C. Magureanu, Kambiz Mahboubi, G. Mahout, K. Meier, A. Migliaccio, G. Mikenberg, A. Mirea, T. H. Moye, K. Nagano, A. Nisati, M. Nomachi, H. Nomoto, Mitsuaki Nozaki, Atsuhiko Ochi, T. Ogata, C. Omachi, H. Oshita, E. Pasqualucci, Francesca Pastore, S. Patricelli, T. Pauly, M. Pectu, M. Perantoni, V. J.O. Perera, R. Perrino, H. Junior Pessoa Lima, E. Petrolo, M. Primavera, L. Prodan, W. Qian, S. Rieke, F. Rühr, A. Rusu, Hiroshi Sakamoto, A. Salamon, D. P.C. Sankey, R. Santonico, O. Sasaki, U. Schäfer, K. Schmitt, G. Schuler, H. -C. Schultz Coulon, Givi Sekhniaidze, S. Silverstein, S. Spagnolo, F. Spila, R. Spiwoks, R. J. Staley, Y. Sugaya, T. Sugimoto, H. Takeda, Tohru TAKESHITA, Shuji Tanaka, Stefan Tapprogge, S. Tarem, J. P. Thomas, T. Trefzger, D. Typaldos, C. Uroseviteanu, Riccardo Vari, S. Veneziano, P. M. Watkins, A. Watson, Pavel WEBER, G. A. Weber, Thorsten Wengler, E. -E. Woehrling, Y. Yamaguchi, Y. Yasu, and L. Zanello

Subjects
Physics, Particle physics, Large Hadron Collider, Muon, business.industry, Physics::Instrumentation and Detectors, ATLAS experiment, Data rate, Calorimeter, Event selection, medicine.anatomical_structure, Atlas (anatomy), medicine, Level trigger, High Energy Physics::Experiment, Detectors and Experimental Techniques, business, Computer hardware
Abstract

Due to the huge interaction rates and the tough experimental environment of pp collisions at a centre-of-mass energy sqrt(s)=14 TeV and luminosities of up to 10^34cm^-2s^-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 40MHz 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. 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. 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. 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. 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.

Published
2005

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