Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....7.2824c&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The Cherenkov imaging technique is the most effective tool to detect and observe gamma-ray cosmic emission above 100 GeV. We propose an imaging Cherenkov telescope, GAW (Gamma Air Watch), designed for observations of very high-energy gamma-ray sources. GAW will be equipped with a 3 meter Fresnel lens light collector and an f/# ˜1.9, and with an array of about 300 multi-anode photomultipliers at the focal plane. The pixel size will be ˜2 arcmin wide, for a total field of view of ˜5.2°. GAW respect to the next planned imaging Cherenkov telescopes (CANGAROO III, HESS, MAGIC, VERITAS) follows a different technique approach being different for what concerns both the optical system and the smaller pixel size. Thanks to the smaller pixel size, the photomultipliers will operate in single photoelectron count mode (instead of charge integration) lowering the photoelectron threshold needed for the cosmic-ray background rejection technique: this consequently allows a low energy threshold in spite of the relatively small dimension of the GAW optics system.
Agnetta Gaetano
Biondo Benedetto
Catalano Osvaldo
Cusumano Giancarlo
Giarrusso Salvatore
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