29 August 2017 First light on a new fully digital camera based on SiPM for CTA SST-1M telescope
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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.
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Domenico della Volpe, Domenico della Volpe, Imen Al Samarai, Imen Al Samarai, Cyril Alispach, Cyril Alispach, Tomasz Bulik, Tomasz Bulik, Jerzy Borkowski, Jerzy Borkowski, Franck Cadoux, Franck Cadoux, Victor Coco, Victor Coco, Yannick Favre, Yannick Favre, Mira Grudzińska, Mira Grudzińska, Matthieu Heller, Matthieu Heller, Marek Jamrozy, Marek Jamrozy, Jerzy Kasperek, Jerzy Kasperek, Etienne Lyard, Etienne Lyard, Emil Mach, Emil Mach, Dusan Mandat, Dusan Mandat, Jerzy Michałowski, Jerzy Michałowski, Rafal Moderski, Rafal Moderski, Teresa Montaruli, Teresa Montaruli, Andrii Neronov, Andrii Neronov, Jacek Niemiec, Jacek Niemiec, T. R. S. Njoh Ekoume, T. R. S. Njoh Ekoume, Michal Ostrowski, Michal Ostrowski, Paweł Paśko, Paweł Paśko, Miroslav Pech, Miroslav Pech, Pawel Rajda, Pawel Rajda, Jakub Rafalski, Jakub Rafalski, Petr Schovanek, Petr Schovanek, Karol Seweryn, Karol Seweryn, Krzysztof Skowron, Krzysztof Skowron, Vitalii Sliusar, Vitalii Sliusar, Łukasz Stawarz, Łukasz Stawarz, Magdalena Stodulska, Magdalena Stodulska, Marek Stodulski, Marek Stodulski, Petr Travnicek, Petr Travnicek, Isaac Troyano Pujadas, Isaac Troyano Pujadas, Roland Walter, Roland Walter, Adam Zagdański, Adam Zagdański, Krzysztof Zietara, Krzysztof Zietara, "First light on a new fully digital camera based on SiPM for CTA SST-1M telescope", Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 1039906 (29 August 2017); doi: 10.1117/12.2272601; https://doi.org/10.1117/12.2272601

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