The Optical Layout Of The HEGRA Cherenkov Telescopes |
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| Authors: | A Akhperjanian R Kankanian V Sahakian A Heusler C-A Wiedner H Wirth |
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| Institution: | (1) Yerevan Physics Institute, Yerevan, Armenia;(2) Max-Planck-Institut für Kernphysik, Heidelberg, Germany |
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| Abstract: | The raytracing technique was used to derive a suitable design for the HEGRA system of Cherenkov telescopes, which is at present commissioned at La Palma. The reflectors with a diameter of  3.9 m consist of 30 spherical mirrors with focal lengths in the range of 4.88 – 4.94 m. It is shown that 93% of the photons from the Cherenkov light emitted by an extended air shower are contained in the camera pixels, 0.25° in diameter, for the full field of view of  = ± 2.5°. The optical performance of the HEGRA design is compared to other layouts. |
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| Keywords: | Optical layout Cherenkov telescope Very high energy gamma ray astronomy |
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