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36 results on '"Lyard, Etienne"'

1. Full LST-1 data reconstruction with the use of convolutional neural networks

Author

Juryšek, Jakub, Lyard, Etienne, and Walter, Roland

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Cherenkov Telescope Array (CTA) will be the world's largest and most sensitive ground-based gamma-ray observatory in the energy range from a few tens of GeV to tens of TeV. The LST-1 prototype, currently in its commissioning phase, is the first of the four largest CTA telescopes, that will be built in the northern site of CTA in La Palma, Canary Islands, Spain. In this contribution, we present a full-image reconstruction method using a modified InceptionV3 deep convolutional neural network applied on non-parametrized shower images. We evaluate the performance of optimized networks on Monte Carlo simulations of LST-1 shower images, and compare the results with the performance of the standard reconstruction method. We also show how both methods work on real-data reconstruction., Comment: 4 pages, 4 figures, Astronomical Data Analysis Software and Systems (ADASS) XXXI conference proceeding

Published
2021

2. Calibration and operation of SiPM-based cameras for gamma-ray astronomy in presence of high night-sky light

Author

Samarai, Imen Al, Alispach, Cyril Martin, Balbo, Matteo, Barbano, Anastasia Maria, Beshley, Vasyl, Biland, Adrian, Blazek, Jiri, Błocki, Jacek, Borkowski, Jerzy, Bulik, Tomek, Cadoux, Frank Raphael, Chytka, Ladislav, Coco, Victor, De Angelis, Nicolas, Della Volpe, Domenico, Favre, Yannick, Gieras, Tomasz, Grudzińska, Mira, Hamal, Petr, Heller, Matthieu, Hrabovsky, Miroslav, Juryšek, Jakub, Kasperek, Jerzy, Koncewicz, Katarzyna, Kotarba, Andrzej, Lyard, Étienne, Mach, Emil, Mandat, Dusan, Michal, Stanislav, Michałowski, Jerzy, Moderski, Rafal, Montaruli, Teresa, Nagai, Andrii, Neise, Dominik, Niemiec, Jacek, Ekoume, Theodore Rodrigue Njoh, Ostrowski, Michal, Palatka, Miroslav, Paśko, Paweł, Pech, Miroslav, Pilszyk, Bartłomiej, Przybilski, Henry, Rajda, Paweł, Renier, Yves, Rozwadowski, Paweł, Schovanek, Petr, Seweryn, Karol, Sliusar, Vitali, Smakulska, Dorota, Sobczyńska, Dorota, Stawarz, Łukasz, Świerblewski, Jacek, Świerk, Paweł, Travnicek, Petr, Pujadas, Isaac Troyano, Walter, Roland, Wiecek, Marek, Zagdański, Aleksander, and Ziȩtara, Krzysztof

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The next generation of Cherenkov telescope cameras feature Silicon Photo Multipliers (SiPM), which can guarantee excellent performance and allow for observation also under moonlight, increasing duty-cycle and therefore the physics reach. A 4 m-diameter Davies-Cotton prototype telescope with a 9-degree optical FoV and a 1296-pixel SiPM camera, has been designed to meet the requirements of the next generation of ground-based gamma-ray observatories at the highest energies. The large-scale production of the telescopes for array deployment has required the development of a fully automated calibration strategy which relies on a dedicated hardware, the Camera Test Setup (CTS). For each camera pixel, the CTS is equipped with two LEDs, one operated in pulsed mode to reproduce signal and one in continuous mode to reproduce night-sky background. In this contribution we will present the camera calibration strategy, from the laboratory measurement to the on-site monitoring with emphasis on the results obtained with the first camera prototype. In addition, key performances such as charge resolution, time resolution and trigger efficiencies and their degradation with increasing night-sky background level will be presented.

Published
2019

3. Monte Carlo study of a single SST-1M prototype for the Cherenkov Telescope Array

Author

Jurysek, Jakub, Samarai, Imen Al, Alispach, Cyril, Balbo, Matteo, Barbano, Anastasia Maria, Beshley, Vasyl, Biland, Adrian, Blazek, Jiri, Błocki, Jacek, Borkowski, Jerzy, Bulik, Tomek, Cadoux, Frank Raphael, Chytka, Ladislav, Coco, Victor, De Angelis, Nicolas, Della Volpe, Domenico, Favre, Yannick, Gieras, Tomasz, Grudzińska, Mira, Hamal, Petr, Heller, Mathieu, Hrabovsky, Miroslav, Kasperek, Jerzy, Koncewicz, Katarzyna, Kotarba, Andrzej, Lyard, Etienne, Mach, Emil, Mandat, Dusan, Michal, Stanislav, Michalowski, Jerzy, Moderski, Rafal, Montaruli, Teresa, Nagai, Andrii, Neise, Dominik, Niemiec, Jacek, Ekoume, Theodore Rodrigue Njoh, Ostrowski, Michal, Palatka, Miroslav, Pasko, Pawel, Pech, Miroslav, Pilszyk, Bartłomiej, Przybilski, Henry, Rajda, Pawel, Renier, Yves, Rozwadowski, Paweł, Schovanek, Petr, Seweryn, K., Sliusar, Vitalii, Smakulska, Dorota, Sobczyńska, Dorota, Stawarz, Łukasz, Świerblewski, Jacek, Świerk, Paweł, Travnicek, Petr, Pujadas, Isaac Troyano, Walter, Roland, Wiecek, Marek, Zagdański, Aleksander, and Zietara, Krzystof

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The SST-1M telescope was developed as a prototype of a Small-Size-Telescope for the Cherenkov Telescope Array observatory and it has been extensively tested in Krakow since 2017. In this contribution we present validation of the Monte Carlo model of the prototype and expected performance in Krakow conditions. We focus on gamma/hadron separation and mono reconstruction of energy and gamma photon arrival direction using Machine learning methods., Comment: 8 pages, 13 figures, ICRC 2019 proceeding

Published
2019

4. Probing Neural Networks for the Gamma/Hadron Separation of the Cherenkov Telescope Array

Author

Lyard, Etienne, Walter, Roland, Sliusar, Vitalii, and Produit, Nicolas

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We compared convolutional neural networks to the classical boosted decision trees for the separation of atmospheric particle showers generated by gamma rays from the particle-induced background. We conduct the comparison of the two techniques applied to simulated observation data from the Cherenkov Telescope Array. We then looked at the Receiver Operating Characteristics (ROC) curves produced by the two approaches and discuss the similarities and differences between both. We found that neural networks overperformed classical techniques under specific conditions., Comment: 6 pages, submitted on May 06 2019 to PoS as proceedings of ACAT2019

Published
2019
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5. An innovative silicon photomultiplier digitizing camera for gamma-ray astronomy

Author

Heller, Matthieu, Schioppa, Enrico Junior, Porcelli, Alessio, Pujadas, Isaac Troyano, Zietara, Krzysztof, Della Volpe, Domenico, Montaruli, Teresa, Cadoux, Franck, Favre, Yannick, Sanchez, Juan Antonio Aguilar, Christov, Asen, Prandini, Elisa, Rajda, Pawel, Rameez, Mohamed, Blinik, Woijciech, Blocki, Jacek, Bogacz, Leszek, Borkowski, Jurek, Bulik, Tomasz, Frankowski, Adam, Grudzinska, Mira, Idzkowski, Bartosz, Jamrozy, Mateusz, Janiak, Mateusz, Kasperek, Jerzy, Lalik, Krzysztof, Lyard, Etienne, Mach, Emil, Mandat, Dusan, Marszalek, Adrian, Miranda, Luis David Medina, Michalowski, Jerzy, Neronov, Andrii, Niemiec, Jacek, Ostrowski, Michal, Pasko, Pawel, Pech, Miroslav, Schovanek, Petr, Seweryn, Karol, Sliusar, Vitalii, Skowron, Krzysztof, Stawarz, Lukasz, Stodulska, Magdalena, Stodulski, Marek, Walter, Roland, Wiecek, Marek, and Zagdanski, Aleksander

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The single-mirror small-size telescope (SST-1M) is one of the three proposed designs for the small-size telescopes (SSTs) of the Cherenkov Telescope Array (CTA) project. The SST-1M will be equipped with a 4 m-diameter segmented mirror dish and an innovative fully digital camera based on silicon photo-multipliers (SiPMs). Since the SST sub-array will consist of up to 70 telescopes, the challenge is not only to build a telescope with excellent performance, but also to design it so that its components can be commissioned, assembled and tested by industry. In this paper we review the basic steps that led to the design concepts for the SST-1M camera and the ongoing realization of the first prototype, with focus on the innovative solutions adopted for the photodetector plane and the readout and trigger parts of the camera. In addition, we report on results of laboratory measurements on real scale elements that validate the camera design and show that it is capable of matching the CTA requirements of operating up to high-moon-light background conditions., Comment: 30 pages, 61 figures

Published
2016
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6. The On-Site Analysis of the Cherenkov Telescope Array

Author

Bulgarelli, Andrea, Fioretti, Valentina, Zoli, Andrea, Aboudan, Alessio, Rodríguez-Vázquez, Juan José, De Cesare, Giovanni, De Rosa, Adriano, Maier, Gernot, Lyard, Etienne, Bastieri, Denis, Lombardi, Saverio, Tosti, Gino, Bergamaschi, Sonia, Beneventano, Domenico, Lamanna, Giovanni, Jacquemier, Jean, Kosack, Karl, Antonelli, Lucio Angelo, Boisson, Catherine, Borkowski, Jerzy, Buson, Sara, Carosi, Alessandro, Conforti, Vito, Colomé, Pep, Reyes, Raquel de los, Dumm, Jon, Evans, Phil, Fortson, Lucy, Fuessling, Matthias, Gotz, Diego, Graciani, Ricardo, Gianotti, Fulvio, Grandi, Paola, Hinton, Jim, Humensky, Brian, Inoue, Susumu, Knödlseder, Jürgen, Flour, Thierry Le, Lindemann, Rico, Malaguti, Giuseppe, Markoff, Sera, Marisaldi, Martino, Neyroud, Nadine, Nicastro, Luciano, Ohm, Stefan, Osborne, Julian, Oya, Igor, Rodriguez, Jerome, Rosen, Simon, Ribo, Marc, Tacchini, Alessandro, Schüssler, Fabian, Stolarczyk, Thierry, Torresi, Eleonora, Testa, Vincenzo, Wegner, Peter, and Weinstein, Amanda

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Cherenkov Telescope Array (CTA) observatory will be one of the largest ground-based very high-energy gamma-ray observatories. The On-Site Analysis will be the first CTA scientific analysis of data acquired from the array of telescopes, in both northern and southern sites. The On-Site Analysis will have two pipelines: the Level-A pipeline (also known as Real-Time Analysis, RTA) and the level-B one. The RTA performs data quality monitoring and must be able to issue automated alerts on variable and transient astrophysical sources within 30 seconds from the last acquired Cherenkov event that contributes to the alert, with a sensitivity not worse than the one achieved by the final pipeline by more than a factor of 3. The Level-B Analysis has a better sensitivity (not be worse than the final one by a factor of 2) and the results should be available within 10 hours from the acquisition of the data: for this reason this analysis could be performed at the end of an observation or next morning. The latency (in particular for the RTA) and the sensitivity requirements are challenging because of the large data rate, a few GByte/s. The remote connection to the CTA candidate site with a rather limited network bandwidth makes the issue of the exported data size extremely critical and prevents any kind of processing in real-time of the data outside the site of the telescopes. For these reasons the analysis will be performed on-site with infrastructures co-located with the telescopes, with limited electrical power availability and with a reduced possibility of human intervention. This means, for example, that the on-site hardware infrastructure should have low-power consumption. A substantial effort towards the optimization of high-throughput computing service is envisioned to provide hardware and software solutions with high-throughput, low-power consumption at a low-cost., Comment: In Proceedings of the 34th International Cosmic Ray Conference (ICRC2015), The Hague, The Netherlands. All CTA contributions at arXiv:1508.05894

Published
2015

7. Modern middleware for the data acquisition of the Cherenkov Telescope Array

Author

Lyard, Etienne, Walter, Roland, Kosack, Karl, Jacquemier, Jean, Oya, Igor, Wegner, Peter, Fuessling, Matthias, and Wu, Xin

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The data acquisition system (DAQ) of the future Cherenkov Telescope Array (CTA) must be ef- ficient, modular and robust to be able to cope with the very large data rate of up to 550 Gbps coming from many telescopes with different characteristics. The use of modern middleware, namely ZeroMQ and Protocol Buffers, can help to achieve these goals while keeping the development effort to a reasonable level. Protocol Buffers are used as an on-line data for- mat, while ZeroMQ is employed to communicate between processes. The DAQ will be controlled and monitored by the Alma Common Software (ACS). Protocol Buffers from Google are a way to define high-level data structures through an in- terface description language (IDL) and a meta-compiler. ZeroMQ is a middleware that augments the capabilities of TCP/IP sockets. It does not implement very high-level features like those found in CORBA for example, but makes use of sockets easier, more robust and almost as effective as raw TCP. The use of these two middlewares enabled us to rapidly develop a robust prototype of the DAQ including data persistence to compressed FITS files., Comment: In Proceedings of the 34th International Cosmic Ray Conference (ICRC2015), The Hague, The Netherlands. All CTA contributions at arXiv:1508.05894

Published
2015

9. Adaptive Body, Motion and Cloth

Author

Magnenat-Thalmann, Nadia, Lyard, Etienne, Kasap, Mustafa, Volino, Pascal, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Egges, Arjan, editor, Kamphuis, Arno, editor, and Overmars, Mark, editor

Published
2008
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10. First measurements and upgrade plans of the MAGIC intensity interferometer

Author

Cortina, Juan, primary, Acciari, Victor, additional, Biland, Adrian, additional, Colombo, Eduardo, additional, da Costa, Carlos, additional, Delgado, Carlos, additional, Díaz, Carlos, additional, Fiori, Michele, additional, Fink, David, additional, Hassan, Tarek, additional, Jiménez-Martínez, Irene, additional, Lyard, Etienne, additional, Mariotti, Mosè, additional, Martínez, Gustavo, additional, Mirzoyan, Razmik, additional, Naletto, Giampiero, additional, Polo, Miguel, additional, Produit, Nicolas, additional, Rodríguez, Juan J., additional, Schweizer, Thomas, additional, Walter, Roland, additional, Wunderlich, Caroline W., additional, and Zampieri, Luca, additional

Published
2022
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12. Intensity interferometry with the MAGIC

Author

Acciary, Victor A., primary, Bernardos, Maria Isabel, additional, Colombo, Eduardo H., additional, Contreras, Jose Luis, additional, Cortina, Juan, additional, Delgado, Carlos, additional, Díaz, Carlos, additional, Fink, David, additional, Hassan, Tarek, additional, Jim ́enez-Mart ́ınez, Irene, additional, Lyard, Etienne, additional, Mariotti, Mose, additional, Mangano, Salvatore, additional, Mirzoyan, Razmik, additional, Produit, Nicola, additional, Polo, Miguel, additional, Schweizer, Thomas, additional, Walter, Roland, additional, Will, Martin, additional, Wunderlich, Caroline, additional, and Zampieri, Luca, additional

Published
2020
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14. The Array Control and Data Acquisition System of the Cherenkov Telescope Array

Author

Oya, Igor, Antolini, Ermete, Füßling, Matthias, Hinton, J, Mitchell, Alison, Schlenstedt, Stefan, Baroncelli, Leonardo, Bulgarelli, Andrea, Conforti, Vito, Parmiggiani, Nicolò, Borkowski, J, Carosi, Alessandro, Jacquemier, Jean, Maurin, Gilles, Colomé, J., Hoischen, Clemens, Lebout, Dylan, Lyard, Etienne, Walter, Roland, Melkumyan, David, Mosshammer, K., Sadeh, Iftach, Schmidt, Thomas, Wegner, Peter, Schwanke, Ullrich, Schwarz, Joseph, Tosti, Giacomo, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Deutsches Elektronen-Synchrotron [Zeuthen] (DESY), Helmholtz-Gemeinschaft = Helmholtz Association, Therenkov Telescope Array Observatory gGmbH [Heidelberg] (CTAO gGmbH), INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), Copernicus Astronomical Center of the Polish Academy of Sciences (CAMK), Polish Academy of Sciences (PAN), Institute for Space Studies of Catalonia [Barcelona] (IEEC-CSIC), Universität Potsdam, Interacting with Large Data (ILDA), Laboratoire de Recherche en Informatique (LRI), Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Université de Genève (UNIGE), Humboldt University of Berlin, INAF - Osservatorio Astronomico di Brera (OAB), Università degli Studi di Perugia (UNIPG), Helmholtz-Gemeinschaft, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut für Physik, Humboldt Universität zu Berlin, University of Potsdam = Universität Potsdam, Université de Genève = University of Geneva (UNIGE), Humboldt University Of Berlin, and Università degli Studi di Perugia = University of Perugia (UNIPG)

Subjects
Cherenkov Telescope Array, software, data acquisition, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], [INFO.INFO-WB]Computer Science [cs]/Web, 7. Clean energy, programming, Accelerator Physics, operation, site, interface, controls, [INFO]Computer Science [cs], [INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC], data management, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], control system, activity report, performance
Abstract

The Cherenkov Telescope Array (CTA) project is the initiative to build the next-generation gamma-ray observatory. With more than 100 telescopes planned to be deployed in two sites, CTA is one of the largest astronomical facilities under construction. The Array Control and Data Acquisition (ACADA) system will be the central element of on-site CTA Observatory operations. The mission of the ACADA system is to manage and optimize the telescope array operations at each of the CTA sites. To that end, ACADA will provide all necessary means for the efficient execution of observations, and for the handling of the several Gb/s generated by each individual CTA telescope. The ACADA system will contain a real-time analysis pipeline, dedicated to the automatic generation of science alert candidates based on the inspection of data being acquired. These science alerts, together with external alerts arriving from other scientific installations, will permit ACADA to modify ongoing observations at sub-minute timescales in order to study high-impact scientific transient phenomena. This contribution describes the challenges, architecture, design principles, and development status of the ACADA system., Proceedings of the 17th International Conference on Accelerator and Large Experimental Physics Control Systems, ICALEPCS2019, New York, NY, USA

Published
2019
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15. A New ACS Bulk Data Transfer Service for CTA

Author

Araya, Mauricio, Castillo, Rodolfo, Jara, Marcelo, Lyard, Etienne, Oya, Igor, Pizarro, Leonardo, and Von Brand, Horst

Subjects
Software Technology Evolution, Accelerator Physics
Abstract

The ALMA Common Software (ACS) framework provides Bulk Data Transfer (BDT) service implementations that need to be updated for new projects that will use ACS, such as the Cherenkov Telescope Array (CTA) and other projects, with most cases having quite different requirements than ALMA. We propose a new open-source BDT service for ACS based on ZeroMQ, that meets CTA data transfer specifications while maintaining retro-compatibility with the closed-source solution used in ALMA. The service uses the push-pull pattern for data transfer, the publisher-subscriber pattern for data control, and Protocol Buffers for data serialization, having also the option to integrate other serialization options easily. Besides complying with ACS interface definition to be used by ACS components and clients, the service provide an independent API to be used outside the ACS framework. Our experiments show a good compromise between throughput and computational effort, suggesting that the service could scale up in terms of number of producers, number of consumers and network bandwidth., Proceedings of the 16th Int. Conf. on Accelerator and Large Experimental Control Systems, ICALEPCS2017, Barcelona, Spain

Published
2018
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16. A simple footskate removal method for virtual reality applications

Author

Lyard, Etienne, Magnenat-Thalmann, Nadia, Lyard, Etienne, and Magnenat-Thalmann, Nadia

Abstract

Footskate is a common problem encountered in interactive applications dealing with virtual character animations. It has proven difficult to fix without the use of complex numerical methods, which require expert skills for their implementations, along with a fair amount of user interaction to correct a motion. On the other hand, deformable bodies are being increasingly used in virtual reality (VR) applications, allowing users to customize their avatar as they wish. This introduces the need of adapting motions without any help from a designer, as a random user seldom has the skills required to drive the existing algorithms towards the right solution. In this paper, we present a simple method to remove footskate artifacts in VR applications. Unlike previous algorithms, our approach does not rely on the skeletal animation to perform the correction but rather on the skin. This ensures that the final foot planting really matches the virtual character's motion. The changes are applied to the root joint of the skeleton only so that the resulting animation is as close as possible to the original one. Eventually, thanks to the simplicity of its formulation, it can be quickly and easily added to existing frameworks

Published
2018

17. Software testing for the CTA observation execution system

Author

Murach, Thomas, primary, Oya, Igor, primary, Füßling, Matthias, primary, Zagar, Anze, primary, Leben, Urban, primary, Dezman, Dejan, primary, Conforti, Vito, primary, Krack, Fabian, primary, Lyard, Etienne, primary, Melkumyan, David, primary, Sadeh, Iftach, primary, Schmidt, Torsten, primary, Schwanke, Ullrich, primary, Schwarz, Joseph, primary, Wiesand, Stephan, primary, and Mosshammer, Klemens, primary

Published
2018
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18. First light on a new fully digital camera based on SiPM for CTA SST-1M telescope

Author

Schovánek, Petr, primary, Rajda, Pawel J., primary, della Volpe, Domenico, primary, Montaruli, Teresa, primary, Heller, Matthieu, primary, Coco, Victor, primary, Al Samarai, Imen, primary, Cadoux, Franck, primary, Favre, Yannick, primary, Alispach, Cyril, primary, Troyano Pujadas, Isaac, primary, Nagai, Andrii, primary, Njoh Ekoume, Theodore R., primary, Walter, Roland, primary, Lyard, Etienne, primary, Neronov, Andrii, primary, Sliusar, Vitalii, primary, Niemiec, Jacek, primary, Mach, Emil, primary, Michalowski, Jerzy, primary, Rafalski, Jakub, primary, Skowron, Krzysztof, primary, Stodulska, Magdalena, primary, Stodulski, Marek, primary, Jamrozy, Marek, primary, Ostrowski, Michal, primary, Stawarz, Lukasz, primary, Zietara, Krzysztof, primary, Borkowski, Jerzy, primary, Moderski, Rafal, primary, Bulik, Tomasz, primary, Grudzińska, Mira, primary, Paśko, Pawel, primary, Seweryn, Karol, primary, Mandat, Dusan, primary, Pech, Miroslav, primary, Kasperek, Jerzy, primary, and Travnicek, Petr, primary

Published
2017
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19. Software Testing for the CTA Observation Execution System.

Author

Murach, Thomas, Zagar, Anze, Leben, Urban, Oya, Igor, Füßing, Matthias, Dezman, Dejan, Conforti, Vito, Krack, Fabian, Lyard, Etienne, Melkumyan, David, Mosshammer, Klemens, Sadeh, Iftach, Schmidt, Torsten, Schwanke, Ullrich, Schwarz, Joseph, and Wiesand, Stephan

Published
2018
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20. Status of the array control and data acquisition system for the Cherenkov Telescope Array

Author

Füßling, Matthias, Oya, Igor, Balzer, Arnim, Berge, David, Borkowski, Jerzy, Conforti, Vito, Colomé, Josep, Lindemann, Rico, Lyard, Etienne, Melkumyan, David, Punch, Michael, Schwanke, Ullrich, Schwarz, Joseph, Tanci, Claudio, Tosti, Gino, Wegner, Peter, Wischnewski, Ralf, Weinstein, Amanda, Füßling, Matthias, Oya, Igor, Balzer, Arnim, Berge, David, Borkowski, Jerzy, Conforti, Vito, Colomé, Josep, Lindemann, Rico, Lyard, Etienne, Melkumyan, David, Punch, Michael, Schwanke, Ullrich, Schwarz, Joseph, Tanci, Claudio, Tosti, Gino, Wegner, Peter, Wischnewski, Ralf, and Weinstein, Amanda

Abstract

The Cherenkov Telescope Array (CTA) will be the next-generation ground-based observatory using the atmospheric Cherenkov technique. The CTA instrument will allow researchers to explore the gamma-ray sky in the energy range from 20 GeV to 300 TeV. CTA will comprise two arrays of telescopes, one with about 100 telescopes in the Southern hemisphere and another smaller array of telescopes in the North. CTA poses novel challenges in the field of ground-based Cherenkov astronomy, due to the demands of operating an observatory composed of a large and distributed system with the needed robustness and reliability that characterize an observatory. The array control and data acquisition system of CTA (ACTL) provides the means to control, readout and monitor the telescopes and equipment of the CTA arrays. The ACTL system must be flexible and reliable enough to permit the simultaneous and automatic control of multiple sub-arrays of telescopes with a minimum effort of the personnel on-site. In addition, the system must be able to react to external factors such as changing weather conditions and loss of telescopes and, on short timescales, to incoming scientific alerts from time-critical transient phenomena. The ACTL system provides the means to time-stamp, readout, filter and store the scientific data at aggregated rates of a few GB/s. Monitoring information from tens of thousands of hardware elements need to be channeled to high performance database systems and will be used to identify potential problems in the instrumentation. This contribution provides an overview of the ACTL system and a status report of the ACTL project within CTA.

Published
2016
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21. Status of the array control and data acquisition system for the Cherenkov Telescope Array

Author

Füßling, Matthias, additional, Oya, Igor, additional, Balzer, Arnim, additional, Berge, David, additional, Borkowski, Jerzy, additional, Conforti, Vito, additional, Colomé, Josep, additional, Lindemann, Rico, additional, Lyard, Etienne, additional, Melkumyan, David, additional, Punch, Michael, additional, Schwanke, Ullrich, additional, Schwarz, Joseph, additional, Tanci, Claudio, additional, Tosti, Gino, additional, Wegner, Peter, additional, Wischnewski, Ralf, additional, and Weinstein, Amanda, additional

Published
2016
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22. Data compression for the first G-APD Cherenkov Telescope

Author

Ahnen, Max M.L., Balbo, Matteo, Bergmann, Matthias, Biland, Adrian, Bretz, Thomas, Buss, Jens, Dorner, Daniela, Einecke, Sabrina, Freiwald, J., Hempfling, Christina, Hildebrand, Dorothée, Hughes, Gareth, Lustermann, Werner, Lyard, Etienne, Mannheim, Karl, Meier, Katja, Mueller, Sebastian Achim, Neise, Dominik, Neronov, Andrii, Overkemping, A.K., Paravac, Aleksander, Pauss, Felicitas, Rhode, Wolfgang, Steinbring, T., Temme, Fabian, Thaele, Julia, Toscano, Simona, Vogler, Patrick, Walter, Roland, Wilbert, A., Ahnen, Max M.L., Balbo, Matteo, Bergmann, Matthias, Biland, Adrian, Bretz, Thomas, Buss, Jens, Dorner, Daniela, Einecke, Sabrina, Freiwald, J., Hempfling, Christina, Hildebrand, Dorothée, Hughes, Gareth, Lustermann, Werner, Lyard, Etienne, Mannheim, Karl, Meier, Katja, Mueller, Sebastian Achim, Neise, Dominik, Neronov, Andrii, Overkemping, A.K., Paravac, Aleksander, Pauss, Felicitas, Rhode, Wolfgang, Steinbring, T., Temme, Fabian, Thaele, Julia, Toscano, Simona, Vogler, Patrick, Walter, Roland, and Wilbert, A.

Abstract

The FACT telescope on the Canaries island of La Palma is the first Imaging Atmospheric Cherenkov Telescope (IACT) to use solid state photomultipliers. It generates up to 2 TB of data per night which motivated us to investigate how to reduce the volume of data. Reducing the throughput enables us to efficiently acquire, store and process the observations data. This document presents the conclusions of this work, along with the implementation of the custom compression algorithm and I/O layer that is currently in use to operate the telescope., 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2015

24. Motion Adaptation Based on Character Shape

Author

Lyard, Etienne, Rolim, Jose, and Magnenat Thalmann, Nadia

Subjects
Réalité virtuelle, Animation par ordinateur, Adaptation de mouvement, ddc:025.063, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

Motion is an important part of virtual environments. Indeed, virtual humans movements must be realistic to trigger the sense of immersiveness and producing such animations is not an easy task which requires hours of manual work by skilled animators. To overcome this issue, motion captured clips tend to replace traditional hand animation because they offer a very high level of realism with minimal manual work. These clips, however, have one major drawback, namely that they can be applied only to a body with similar shape and sizes as the person who was captured...

Published
2008
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25. A prototype for the real-time analysis of the Cherenkov Telescope Array

Author

Bulgarelli, Andrea, additional, Fioretti, Valentina, additional, Zoli, Andrea, additional, Aboudan, Alessio, additional, Rodríguez-Vázquez, Juan José, additional, Maier, Gernot, additional, Lyard, Etienne, additional, Bastieri, Denis, additional, Lombardi, Saverio, additional, Tosti, Gino, additional, De Rosa, Adriano, additional, Bergamaschi, Sonia, additional, Interlandi, Matteo, additional, Beneventano, Domenico, additional, Lamanna, Giovanni, additional, Jacquemier, Jean, additional, Kosack, Karl, additional, Antonelli, Lucio Angelo, additional, Boisson, Catherine, additional, Burkowski, Jerzy, additional, Buson, Sara, additional, Carosi, Alessandro, additional, Conforti, Vito, additional, Contreras, Jose Luis, additional, De Cesare, Giovanni, additional, de los Reyes, Raquel, additional, Dumm, Jon, additional, Evans, Phil, additional, Fortson, Lucy, additional, Fuessling, Matthias, additional, Graciani, Ricardo, additional, Gianotti, Fulvio, additional, Grandi, Paola, additional, Hinton, Jim, additional, Humensky, Brian, additional, Knödlseder, Jürgen, additional, Malaguti, Giuseppe, additional, Marisaldi, Martino, additional, Neyroud, Nadine, additional, Nicastro, Luciano, additional, Ohm, Stefan, additional, Osborne, Julian, additional, Rosen, Simon, additional, Tacchini, Alessandro, additional, Torresi, Eleonora, additional, Testa, Vincenzo, additional, Trifoglio, Massimo, additional, and Weinstein, Amanda, additional

Published
2014
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26. Towards a global software architecture for operating and controlling the Cherenkov Telescope Array

Author

Füssling, Matthias, additional, Oya, Igor, additional, Schwanke, Ullrich, additional, Campreciós, Jordi, additional, Colomé, Josep, additional, Le Flour, Thierry, additional, Lindemann, Rico, additional, Lyard, Etienne, additional, Melkumyan, David, additional, Schmidt, Torsten, additional, Schwarz, Joseph, additional, Tosti, Gino, additional, Wegner, Peter, additional, and Weinstein, Amanda, additional

Published
2014
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27. Software testing for the CTA observation execution system

Author

Guzman, Juan C., Ibsen, Jorge, Murach, Thomas, Zagar, Anze, Leben, Urban, Oya, Igor, Füßling, Matthias, Dezman, Dejan, Conforti, Vito, Krack, Fabian, Lyard, Etienne, Melkumyan, David, Mosshammer, Klemens, Sadeh, Iftach, Schmidt, Torsten, Schwanke, Ullrich, Schwarz, Joseph, and Wiesand, Stephan

Published
2018
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32. A prototype for the real-time analysis of the Cherenkov Telescope Array

Author

Stepp, Larry M., Gilmozzi, Roberto, Hall, Helen J., Bulgarelli, Andrea, Fioretti, Valentina, Zoli, Andrea, Aboudan, Alessio, Rodríguez-Vázquez, Juan José, Maier, Gernot, Lyard, Etienne, Bastieri, Denis, Lombardi, Saverio, Tosti, Gino, De Rosa, Adriano, Bergamaschi, Sonia, Interlandi, Matteo, Beneventano, Domenico, Lamanna, Giovanni, Jacquemier, Jean, Kosack, Karl, Antonelli, Lucio Angelo, Boisson, Catherine, Burkowski, Jerzy, Buson, Sara, Carosi, Alessandro, Conforti, Vito, Contreras, Jose Luis, De Cesare, Giovanni, de los Reyes, Raquel, Dumm, Jon, Evans, Phil, Fortson, Lucy, Fuessling, Matthias, Graciani, Ricardo, Gianotti, Fulvio, Grandi, Paola, Hinton, Jim, Humensky, Brian, Knödlseder, Jürgen, Malaguti, Giuseppe, Marisaldi, Martino, Neyroud, Nadine, Nicastro, Luciano, Ohm, Stefan, Osborne, Julian, Rosen, Simon, Tacchini, Alessandro, Torresi, Eleonora, Testa, Vincenzo, Trifoglio, Massimo, and Weinstein, Amanda

Published
2014
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33. A simple footskate removal method for virtual reality applications

Author

Lyard, Etienne, Magnenat-Thalmann, Nadia, Lyard, Etienne, and Magnenat-Thalmann, Nadia

Abstract

Footskate is a common problem encountered in interactive applications dealing with virtual character animations. It has proven difficult to fix without the use of complex numerical methods, which require expert skills for their implementations, along with a fair amount of user interaction to correct a motion. On the other hand, deformable bodies are being increasingly used in virtual reality (VR) applications, allowing users to customize their avatar as they wish. This introduces the need of adapting motions without any help from a designer, as a random user seldom has the skills required to drive the existing algorithms towards the right solution. In this paper, we present a simple method to remove footskate artifacts in VR applications. Unlike previous algorithms, our approach does not rely on the skeletal animation to perform the correction but rather on the skin. This ensures that the final foot planting really matches the virtual character's motion. The changes are applied to the root joint of the skeleton only so that the resulting animation is as close as possible to the original one. Eventually, thanks to the simplicity of its formulation, it can be quickly and easily added to existing frameworks

34. First light on a new fully digital camera based on SiPM for CTA SST-1M telescope

Author

O'Dell, Stephen L., Pareschi, Giovanni, della Volpe, Domenico, Al Samarai, Imen, Alispach, Cyril, Bulik, Tomasz, Borkowski, Jerzy, Cadoux, Franck, Coco, Victor, Favre, Yannick, Grudzińska, Mira, Heller, Matthieu, Jamrozy, Marek, Kasperek, Jerzy, Lyard, Etienne, Mach, Emil, Mandat, Dusan, Michałowski, Jerzy, Moderski, Rafal, Montaruli, Teresa, Neronov, Andrii, Niemiec, Jacek, Njoh Ekoume, T. R. S., Ostrowski, Michal, Paśko, Paweł, Pech, Miroslav, Rajda, Pawel, Rafalski, Jakub, Schovanek, Petr, Seweryn, Karol, Skowron, Krzysztof, Sliusar, Vitalii, Stawarz, Łukasz, Stodulska, Magdalena, Stodulski, Marek, Travnicek, Petr, Troyano Pujadas, Isaac, Walter, Roland, Zagdański, Adam, and Zietara, Krzysztof

Published
2017
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36. An innovative silicon photomultiplier digitizing camera for gamma-ray astronomy

Author

M. Heller, E. jr Schioppa, A. Porcelli, I. Troyano Pujadas, K. Ziȩtara, D. della Volpe, T. Montaruli, F. Cadoux, Y. Favre, J. A. Aguilar, A. Christov, E. Prandini, P. Rajda, M. Rameez, W. Bilnik, J. Błocki, L. Bogacz, J. Borkowski, T. Bulik, A. Frankowski, M. Grudzińska, B. Idźkowski, M. Jamrozy, M. Janiak, J. Kasperek, K. Lalik, E. Lyard, E. Mach, D. Mandat, A. Marszałek, L. D. Medina Miranda, J. Michałowski, R. Moderski, A. Neronov, J. Niemiec, M. Ostrowski, P. Paśko, M. Pech, P. Schovanek, K. Seweryn, V. Sliusar, K. Skowron, Ł. Stawarz, M. Stodulska, M. Stodulski, R. Walter, M. Wiȩcek, A. Zagdański, Heller, Matthieu, Schioppa, Enrico junior, Porcelli, Alessio, Troyano Pujadas, Isaac, Zietara, Krzysztof, Della Volpe, Domenico, Montaruli, Teresa, Cadoux, Franck, Favre, Yannick, Antonio Aguilar Sanchez, Juan, Christov, Asen, Prandini, Elisa, Rajda, Pawel, Rameez, Mohamed, Blinik, Woijciech, Blocki, Jacek, Bogacz, Leszek, Borkowski, Jurek, Bulik, Tomasz, Frankowski, Adam, Grudzinska, Mira, Idzkowski, Bartosz, Jamrozy, Mateusz, Janiak, Mateusz, Kasperek, Jerzy, Lalik, Krzysztof, Lyard, Etienne, Mach, Emil, Mandat, Dusan, Marszalek, Adrian, David Medina Miranda, Lui, Michalowski, Jerzy, Neronov, Andrii, Niemiec, Jacek, Ostrowski, Michal, Pasko, Pawel, Pech, Miroslav, Schovanek, Petr, Seweryn, Karol, Sliusar, Vitalii, Skowron, Krzysztof, Stawarz, Lukasz, Stodulska, Magdalena, Stodulski, Marek, Walter, Roland, Wiecek, Marek, Zagdanski, Aleksander, Schioppa, Enrico Junior, Aguilar, J. A., and Miranda, David

Subjects
business.product_category, Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), Computer science, Segmented mirror, FOS: Physical sciences, Photodetector, ddc:500.2, 7. Clean energy, 01 natural sciences, law.invention, Telescope, Silicon photomultiplier, law, 0103 physical sciences, Engineering (miscellaneous), Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Digital camera, 010308 nuclear & particles physics, business.industry, Instrumentation and Detectors (physics.ins-det), Gamma-ray astronomy, Cherenkov Telescope Array, Focus (optics), business, Astrophysics - Instrumentation and Methods for Astrophysics, Computer hardware
Abstract

The single-mirror small-size telescope (SST-1M) is one of the three proposed designs for the small-size telescopes (SSTs) of the Cherenkov Telescope Array (CTA) project. The SST-1M will be equipped with a 4 m-diameter segmented mirror dish and an innovative fully digital camera based on silicon photo-multipliers (SiPMs). Since the SST sub-array will consist of up to 70 telescopes, the challenge is not only to build a telescope with excellent performance, but also to design it so that its components can be commissioned, assembled and tested by industry. In this paper we review the basic steps that led to the design concepts for the SST-1M camera and the ongoing realization of the first prototype, with focus on the innovative solutions adopted for the photodetector plane and the readout and trigger parts of the camera. In addition, we report on results of laboratory measurements on real scale elements that validate the camera design and show that it is capable of matching the CTA requirements of operating up to high-moon-light background conditions., 30 pages, 61 figures

Published
2016

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