Dr. Matthieu Heller Profile

Dr. Matthieu Heller

Postdoctoral Research Associate at Univ. de Genève

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Publications (4)

Proceedings Article | 29 August 2017 Paper

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

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

Proceedings Volume 10399, 1039906 (2017) https://doi.org/10.1117/12.2272601

KEYWORDS: Atmospheric Cherenkov telescopes, Telescopes, Cameras, Electronics, Mirrors, Atmospheric optics, Solar concentrators, Digital electronics, Signal processing, Field programmable gate arrays

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The Cherenkov Telescope Array (CTA) will explore with unprecedented precision the Universe in the gammaray domain covering an energy range from 50 GeV to more the 300 TeV. To cover such a broad range with a sensitivity which will be ten time better than actual instruments, different types of telescopes are needed: the Large Size Telescopes (LSTs), with a ∼24 m diameter mirror, a Medium Size Telescopes (MSTs), with a ∼12 m mirror and the small size telescopes (SSTs), with a ∼4 m diameter mirror. The single mirror small size telescope (SST-1M), one of the proposed solutions to become part of the small-size telescopes of CTA, will be equipped with an innovative camera. The SST-1M has a Davies-Cotton optical design with a mirror dish of 4 m diameter and focal ratio 1.4 focussing the Cherenkov light produced in atmospheric showers onto a 90 cm wide hexagonal camera providing a FoV of 9 degrees. The camera is an innovative design based on silicon photomultipliers (SiPM ) and adopting a fully digital trigger and readout architecture. The camera features 1296 custom designed large area hexagonal SiPM coupled to hollow optical concentrators to achieve a pixel size of almost 2.4 cm. The SiPM is a custom design developed with Hamamatsu and with its active area of almost 1 cm² is one of the largest monolithic SiPM existing. Also the optical concentrators are innovative being light funnels made of a polycarbonate substrate coated with a custom designed UV-enhancing coating. The analog signals coming from the SiPM are fed into the fully digital readout electronics, where digital data are processed by high-speed FPGAs both for trigger and readout. The trigger logic, implemented into an Virtex 7 FPGA, uses the digital data to elaborate a trigger decision by matching data against predefined patterns. This approach is extremely flexible and allows improvements and continued evolutions of the system. The prototype camera is being tested in laboratory prior to its installation expected in fall 2017 on the telescope prototype in Krakow (Poland). In this contribution, we will describe the design of the camera and show the performance measured in laboratory.

Proceedings Article | 22 August 2016 Paper

The Cherenkov Telescope Array Observatory: top level use cases

A. Bulgarelli, K. Kosack, J. Hinton, G. Tosti, U. Schwanke, J. Schwarz, P. Colomé, V. Conforti, B. Khelifi, J. Goullon, R. Ong, S. Markoff, J. L. Contreras, F. Lucarelli, L. Antonelli, C. Bigongiari, C. Boisson, Z. Bosnjak, S. Brau-Nogué, A. Carosi, A. Chen, G. Cotter, S. Covino, M. Daniel, G. De Cesare, E. de Ona Wilhelmi, M. Della Volpe, F. Di Pierro, V. Fioretti, M. Füßling, M. Garczarczyk, M. Gaug, J. F. Glicenstein, P. Goldoni, D. Götz, P. Grandi, M. Heller, G. Hermann, S. Inoue, J. Knödlseder, J.-P. Lenain, E. Lindfors, S. Lombardi, P. Luque-Escamilla, G. Maier, M. Marisaldi, C. Mundell, N. Neyroud, K. Noda, P. O'Brien, P. O. Petrucci, J. Martí Ribas, M. Ribó, J. Rodriguez, P. Romano, J. Schmid, N. Serre, H. Sol, F. Schussler, A. Stamerra, T. Stolarczyk, J. Vandenbrouck, S. Vercellone, S. Vergani, A. Zech, A. Zoli

Proceedings Volume 9913, 991331 (2016) https://doi.org/10.1117/12.2232224

KEYWORDS: Observatories, Atmospheric Cherenkov telescopes, Telescopes, Software development, Astronomy, Software engineering, Physics, Telecommunications, Error analysis, Galactic astronomy

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Today the scientific community is facing an increasing complexity of the scientific projects, from both a technological and a management point of view. The reason for this is in the advance of science itself, where new experiments with unprecedented levels of accuracy, precision and coverage (time and spatial) are realised. Astronomy is one of the fields of the physical sciences where a strong interaction between the scientists, the instrument and software developers is necessary to achieve the goals of any Big Science Project. The Cherenkov Telescope Array (CTA) will be the largest ground-based very high-energy gamma-ray observatory of the next decades. To achieve the full potential of the CTA Observatory, the system must be put into place to enable users to operate the telescopes productively. The software will cover all stages of the CTA system, from the preparation of the observing proposals to the final data reduction, and must also fit into the overall system. Scientists, engineers, operators and others will use the system to operate the Observatory, hence they should be involved in the design process from the beginning. We have organised a workgroup and a workflow for the definition of the CTA Top Level Use Cases in the context of the Requirement Management activities of the CTA Observatory. Scientists, instrument and software developers are collaborating and sharing information to provide a common and general understanding of the Observatory from a functional point of view. Scientists that will use the CTA Observatory will provide mainly Science Driven Use Cases, whereas software engineers will subsequently provide more detailed Use Cases, comments and feedbacks. The main purposes are to define observing modes and strategies, and to provide a framework for the flow down of the Use Cases and requirements to check missing requirements and the already developed Use-Case models at CTA sub-system level. Use Cases will also provide the basis for the definition of the Acceptance Test Plan for the validation of the overall CTA system. In this contribution we present the organisation and the workflow of the Top Level Use Cases workgroup.

Proceedings Article | 27 July 2016 Paper

Front-end and slow control electronics for large area SiPMs used for the single mirror Small Size Telescope (SST-1M) of the Cherenkov Telescope Array (CTA)

J. Aguilar, W. Bilnik, J. Borkowski, F. Cadoux, A. Christov, D. della Volpe, Y. Favre, M. Heller, J. Kasperek, E. Lyard, A. Marszalek, R. Moderski, T. Montaruli, A. Porcelli, E. Prandini, P. Rajda, M. Rameez, E. jr. Schioppa, I. Troyano Pujadas, K. Ziętara, J. Blocki, L. Bogacz, T. Bulik, M. Curyło, M. Dyrda, A. Frankowski, Ł. Grudniki, M. Grudzinska, B. Idźkowski, M. Jamrozy, M. Janiak, K. Lalik, E. Mach, D. Mandat, J. Michalowski, A. Neronov, J. Niemiec, M. Ostrowski, P. Paśko, M. Pech, P. Schovanek, K. Seweryn, K. Skowron, V. Sliusar, M. Sowinski, Ł. Stawarz, M. Stodulska, M. Stodulski, S. Toscano, R. Walter, M. Więcek, A. Zagdański, P. Żychowski

Proceedings Volume 9915, 99152T (2016) https://doi.org/10.1117/12.2232982

KEYWORDS: Atmospheric Cherenkov telescopes, Telescopes, Electronics, Sensors, Control systems, Mirrors, Resistors, Observatories, Cameras, Picosecond phenomena

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Proceedings Article | 27 July 2016 Paper

The single mirror small size telescope (SST-1M) of the Cherenkov Telescope Array

J. Aguilar, W. Bilnik, J. Borkowski, F. Cadoux, A. Christov, D. della Volpe, Y. Favre, M. Heller, J. Kasperek, E. Lyard, A. Marszałek, R. Moderski, T. Montaruli, A. Porcelli, E. Prandini, P. Rajda, M. Rameez, E.jr Schioppa, I. Troyano Pujadas, K. Ziętara, J. Blocki, L. Bogacz, T. Bulik, A. Frankowski, M. Grudzinska, B. Idźkowski, M. Jamrozy, M. Janiak, K. Lalik, E. Mach, D. Mandat, J. Michałowski, A. Neronov, J. Niemiec, M. Ostrowski, P. Paśko, M. Pech, P. Schovanek, K. Seweryn, K. Skowron, V. Sliusar, L. Stawarz, M. Stodulska, M. Stodulski, S. Toscano, R. Walter, M. Wiȩcek, A. Zagdański

Proceedings Volume 9906, 990636 (2016) https://doi.org/10.1117/12.2233362

KEYWORDS: Imaging systems, Atmospheric Cherenkov telescopes, Telescopes, Cameras, Mirrors, Sensors, Photodetectors, Prototyping, Computer aided design, Electronics

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