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Calibration and operation of SiPM-based cameras for gamma-ray astronomy in presence of high night-sky light
(2021)PoS: Proceedings of Science ~ Proceedings of 36th International Cosmic Ray Conference (ICRC 2019)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 ...Conference Paper -
Monte Carlo study of a single SST-1M prototype for the Cherenkov Telescope Array
(2021)PoS: Proceedings of Science ~ Proceedings of th 36th International Cosmic Ray Conference (ICRC 2019)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.Conference Paper -
GAMAS - A Generic And Multipurpose Archive System
(2019)PoS: Proceedings of Science ~ Proceedings of 36th International Cosmic Ray Conference (ICRC 2019)There exist many distributed storage systems that are mature and reliable. These systems are not fully adapted to the needs of an open astroparticle community mainly because they do not follow the Open Archival Information Systems (OAIS) standard. Moreover they require adaptations by each of the data centres at which they are installed. We introduce GAMAS, a novel distributed OAIS that tackles the problem of different technologies used ...Conference Paper -
Geiger-mode avalanche photodiodes as photodetectors in Cherenkov astronomy
(2010)PoS: Proceedings of scienceThe progress in the development of Geiger-mode avalanche photodiodes (G-APD) has resulted in devices which show great promise for Imaging Atmospheric Cherenkov Telescopes (IACT). In the course of the First G-APD Camera Test (FACT) project with the purpose to construct a G-APD based camera, their characteristics are analysed and measured in detail. The angle dependence of the photon detection efficiency was measured and found to be flat. ...Conference Paper -
The SST-1M project for the Cherenkov Telescope Array
(2021)PoS: Proceedings of Science ~ Proceedings of 36th International Cosmic Ray Conference (ICRC 2019)The SST-1M project, run by a Consortium of institutes from Czech Republic, Poland and Switzerland, has been proposed as a solution for implementing the small-size telescope array of the southern site of the Cherenkov Telescope Array. The technology is a pathfinder for efficient production of cost-effective imaging air Cherenkov telescopes. We report on the main system features and recent upgrades, the performances validation and the ...Conference Paper -
Measuring the Optical Point Spread Function of FACT Using the Cherenkov Camera
(2018)PoS: Proceedings of ScienceFACT, the First G-APD Cherenkov Telescope, is an Imaging Air Cherenkov Telescope (IACT) operating since 2011 at the Observatorio del Roque de los Muchachos on the Canary Island of La Palma. As typical for IACTs, its reflector is comprised of smaller mirror facets and not protected by a dome. In the case of FACT, 30 hexagonal facets form a total mirror area of 9.5 m 2 . Hence, it is crucial to monitor the optical properties of this ...Conference Paper -
Single Photon Extraction for FACT’s SiPMs allows for Novel IACT Event Representation
(2018)PoS: Proceedings of Science ~ Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)Imaging Atmospheric Cherenkov Telescopes provide large gamma-ray collection areas > 10^4 m^2 and successfully probe the high energetic gamma-ray sky by observing extensive air showers during the night. The First G-APD Cherenkov Telescope (FACT) explores silicon based photoelectric converters (called G-APDs or SiPMs) which provide more observation time with strong moonlight, a more stable photon gain over years of observations, and ...Conference Paper -
FACT – Performance of the First Cherenkov Telescope Observing with SiPMs
(2018)PoS: Proceedings of Science ~ Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)The First G-APD Cherenkov Telescope (FACT) is pioneering the usage of silicon photo mul- tipliers (SiPMs also known as G-APDs) for the imaging atmospheric Cherenkov technique. It is located at the Observatorio Roque de los Muchachos on the Canary island of La Palma. Since first light in October 2011, it is monitoring bright TeV blazars in the northern sky. By now, FACT is the only imaging atmospheric Cherenkov telescope operating with S ...Conference Paper -
Higher Order Temperature Dependence of SiPM used in FACT
(2018)PoS: Proceedings of Science ~ Proceedings of the 35th International Cosmic Ray Conference (ICRC 2017)Solid state photosensors, usually called SiPM or G-APD, seem ideal devices to be used in Imaging Atmospheric Cherenkov Telescopes (IACT). Nevertheless, their temperature dependence poses questions about their suitability in the harsh environment intrinsic to the operation of IACTs. While detailed measurements in the laboratory are possible with some sample sensors, limited data about the performance and uniformity of large samples exist. ...Conference Paper -
FACT - Searching for periodicity in five-year light-curves of Active Galactic Nuclei
(2018)PoS: Proceedings of ScienceThe First G-APD Cherenkov Telescope (FACT) has been monitoring Active Galactic Nuclei (AGN) for the past five years. The use of robust silicon photomultipliers (SiPMs) allows for a continuous, unbiased sampling even during bright-light conditions. This dataset promises insights into the core regions of AGN by investigating the periodicity of the sources. Periodic changes in the flux could indicate a binary nature of the supermassive black ...Conference Paper