Calibration Results for the First Two H.E.S.S. Array Telescopes

Details Calibration Results for the First Two H.E.S.S. Array Telescopes Calibration Results for the First Two H.E.S.S. Array Telescopes

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2895l&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

5

Scientific paper

The first two telescopes of the H·E·S·S· stereoscopic system have been installed in Namibia and have been operating since June 2002 and February 2003 respectively. Each camera [2] is equipp ed with 960 PMs with two amplification channels per pixel, yielding both a large dynamic range up to 1600 photo-electrons and low electronic noise to get high resolution on single photo-electron signals. Several parallel methods have been developed to determine and monitor the various calibration parameters using LED systems, laser and Cherenkov events. Results including pedestals, gains, flat-fielding and night sky background estimations will be presented, emphasizing the use of muon images for absolute calibration of the camera and mirror global efficiency, including lower atmosphere effects. These methods allow a precise monitoring of the telescopes and have shown consistent results and a very good stability of the system since the start of operation.

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