The expected characteristics of the Cherenkov telescope TAIGA-IACT equipped with SiPM detectors

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Abstract

Monte-Carlo modeling of effective area and count rate of the TAIGA-IACT Cherenkov gamma-ray telescope unit with an upgraded camera based on SiPM OnSemi MicroFJ-60035 detectors and optical filters SL 290-590 and SL 290-590 has been carried out. It has been shown that with the SL 290-590 filter the threshold detection energy of the telescope would be improved compared with its current PMT-based configuration and would reach about 0.4 TeV. With the narrow band UV filter SL 290-590 the estimated threshold would reach about 0.7 TeV, which is a reasonable value for a 10 m2 class IACT, especially because with a SiPM-based telescope it will be possible to carry out observations during moonlit nights and at twilight without a substantial increase of the threshold. One may conclude that an upgraded TAIGA-IACT unit will be an efficient instrument for studies of TeV-band gamma-ray emission of various cosmic objects.

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About the authors

E. E. Kholupenko

Ioffe Institute

Author for correspondence.
Email: eugene@astro.ioffe.ru
Russian Federation, Saint Petersburg

A. M. Krasilschikov

Ioffe Institute

Email: eugene@astro.ioffe.ru
Russian Federation, Saint Petersburg

D. V. Badmaev

Ioffe Institute

Email: eugene@astro.ioffe.ru
Russian Federation, Saint Petersburg

A. A. Bogdanov

Ioffe Institute

Email: eugene@astro.ioffe.ru
Russian Federation, Saint Petersburg

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Supplementary files

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2. Fig. 1. Dependences of the profiles on the wavelength: 1 - average spectrum of Cherenkov radiation from the SHAL caused by a gamma-quantum with an energy of 1 TeV, normalised by 100% at the maximum at a wavelength of ≈330 nm (curve of long dashes); 2 - an example of a specific realisation of the spectrum of the night sky background (normalised by 100% at the maximum at a wavelength of ≈557 nm) modelled by the Monte Carlo method (curve of short dashes); 3 - photon detection efficiency of OnSemi MicroFJ-60035 SiPM (solid curve); 4 - transmission coefficient of SL 290-590 filter (dashed curve); 5 - transmission coefficient of SL 280-390 filter (dashed curve with two dots)

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3. Fig. 2. Dependences of effective areas on the primary particle energy obtained by the Monte Carlo method are shown by symbols, the corresponding approximations - by curves. Squares and solid curve correspond to the results for gamma rays using the SL 290-590 filter. Rhombuses and dashed curve correspond to the results for CL protons when using the SL 290-590 filter. The upward pointing triangles and the dashed curve correspond to the results for gamma rays when using the SL 280-390 filter. The triangles pointing downwards and the dashed curve correspond to the results for CL protons using the SL 280-390 filter

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