Status of the THEMISTOCLE multi-mirror Cerenkov array for VHE/UHE source studies

Astronomy and Astrophysics – Astronomy

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Angular Resolution, Cerenkov Counters, Cosmic Ray Showers, Gamma Ray Telescopes, Primary Cosmic Rays, Hadrons, Monte Carlo Method

Scientific paper

Detector characteristics and calibration techniques of the THEMISTOCLE multimirror Cerenkov array for VHE/UHE source studies are discussed. The 18 telescopes of the THEMISTOCLE setup have parabolic mirrors 80 cm in diameter; the focal length is about 40.4 cm, and the image size for a point source is on the order of 1 mm. The light is detected by a single XP2020 photomultiplier tube normally operated with a 1.6-cm diameter diaphragm covering the 5-cm diameter cathode. A light-tight cylindrical housing and cover make it possible to perform daytime testing. Relative timing calibration is provided using a nitrogen laser whose light pulse has a 2-ns risetime. Tracking and timing calibration, vertical shower studies, and some Cyg-X3 data acquisition are reported.

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