Temperature characterization of the CITIROC front-end chip of the ASTRI SST-2M Cherenkov camera

D. Impiombato; S. Giarrusso; T. Mineo; O. Catalano; C. Gargano; G. La Rosa; F. Russo; P. Sangiorgi; G. Sottile; G. Bonanno; S. Garozzo; A. Grillo; D. Marano; G. Romeo

doi:10.1117/12.2231099

27 July 2016 Temperature characterization of the CITIROC front-end chip of the ASTRI SST-2M Cherenkov camera

D. Impiombato, S. Giarrusso, T. Mineo, O. Catalano, C. Gargano, G. La Rosa, F. Russo, P. Sangiorgi, G. Sottile, G. Bonanno, S. Garozzo, A. Grillo, D. Marano, G. Romeo

Author Affiliations +

Proceedings Volume 9906, Ground-based and Airborne Telescopes VI; 990645 (2016) https://doi.org/10.1117/12.2231099
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The Cherenkov Imaging Telescope Integrated Read Out Chip, CITIROC, is the front-end chip of the camera for the ASTRI SST-2M, one of the prototypes for the small sized telescopes of the Cherenkov Telescope Array, CTA. The telescope, operating in the energy range from a few TeV to beyond 300 TeV, is characterized by innovative technological solutions. The optical system is arranged in a dual-mirror configuration and the focal plane camera consists of a matrix of multi-pixel Silicon Photo-Multipliers. Among others, one of the most important project issue consists in the thermal characterization of the camera that, in the ASTRI SST-2M prototype, is thermo-controlled in a narrow temperature range. A set of at least nine similar telescopes will form the ASTRI mini-array proposed to be installed at the CTA southern site. In the cameras of the ASTRI mini-array telescopes the thermal control could be relaxed with a considerable gain in terms of power consumption, cost and simplicity. So, a study of the temperature dependence of the camera components is needed. The present work addresses this issue showing the results of the measurements carried out on CITIROC as a function of the temperature. We focused our investigation on the pedestal stability, linearity of the charge output signal, preamplifier gain and trigger uniformity in the temperature range 15-30°C. Our results show, for each of the above-mentioned measurable quantities, that temperature dependency is at the level of a few percent.

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D. Impiombato, S. Giarrusso, T. Mineo, O. Catalano, C. Gargano, G. La Rosa, F. Russo, P. Sangiorgi, G. Sottile, G. Bonanno, S. Garozzo, A. Grillo, D. Marano, and G. Romeo "Temperature characterization of the CITIROC front-end chip of the ASTRI SST-2M Cherenkov camera", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990645 (27 July 2016); https://doi.org/10.1117/12.2231099

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