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
The single mirror Small Size Telescope (SST-1M) project proposes a design among others for the smallest type of telescopes (SST), that will compose the south observatory of the Cherenkov Telescope Array (CTA). The SST camera collecting the Cherenkov light resulting from very high energy gamma-ray interactions in the atmosphere proposes to use Silicon PhotoMultipliers (SiPM). The SST-1M design has led to the use of unique pixel shape and size that required a dedicated development by the University of Geneva and Hamamatsu. An active surface of ~94 mm2 and a resulting total capacitance of ~3.4 nF combined with the stringent requirements of the CTA project on timing and charge resolution have led the University of Geneva to develop a custom preamplifier stage and slow-control system. The design and performance of the tailor made preamplifier stage and of the slow control electronics will be briefly described. The bias circuit of the sensor contains a resistor meant to prevent the sensor from drawing high current. However this resistor also introduces a voltage drop at the sensor input impacting the stability of its operation. A model has been developed in order to derive the parameters needed to account for it at the data analysis level. A solution based on the SST-1M front-end and digital readout is proposed to compensate for the voltage drop at the sensor cathode.
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
The Small Size Telescope with Single Mirror (SST-1M) is one of the proposed types of Small Size Telescopes (SST) for the Cherenkov Telescope Array (CTA). The CTA south array will be composed of about 100 telescopes, out of which about 70 are of SST class, which are optimized for the detection of gamma rays in the energy range from 5 TeV to 300 TeV. The SST-1M implements a Davies-Cotton optics with a 4 m dish diameter with a field of view of 9°. The Cherenkov light produced in atmospheric showers is focused onto a 88 cm wide hexagonal photo-detection plane, composed of 1296 custom designed large area hexagonal silicon photomultipliers (SiPM) and a fully digital readout and trigger system. The SST-1M camera has been designed to provide high performance in a robust as well as compact and lightweight design. In this contribution, we review the different steps that led to the realization of the telescope prototype and its innovative camera.
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