GAW (Gamma Air Watch): a novel imaging Cherenkov telescope

Details GAW (Gamma Air Watch): a novel imaging Cherenkov telescope GAW (Gamma Air Watch): a novel imaging Cherenkov telescope

2001-10-26

arxiv.org/abs/astro-ph/0110572v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3figures, to be published in the proceedings of Frascati Workshop 2001 Vulcano, May 21-26, 2001

Scientific paper

GAW (Gamma Air Watch) is a new imaging Cherenkov telescope designed for observation of very high-energy gamma-ray sources. GAW will be equipped with a 3 meter diameter Fresnel lens as light collector and with an array of 300 multi-anode photomultipliers at the focal plane. The pixel size will be 4 arcmin wide for a total field of view of 10.5 degrees. Whith respect to the planned imaging Cherenkov telescopes (CANGAROO III, HESS, MAGIC, VERITAS) GAW follows a different approach for what concerns both the optical system and the detection working mode: the Cherenkov light collector is a single acrylic flat Fresnel lens (instead of mirrors) that allows to achieve wide field of view; the photomultipliers operate in single photoelectron counting mode (instead of charge integration). The single photoelectron counting mode allows to reach a low energy threshold of ~200 GeV, in spite of the relatively small dimension of the GAW optic system.

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