An Absolute Light Flux Calibration for the MAGIC Telescope

Details An Absolute Light Flux Calibration for the MAGIC Telescope An Absolute Light Flux Calibration for the MAGIC Telescope

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2923g&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

Scientific paper

The 17 m diameter Air Cherenkov telescope MAGIC [1,2] has a 577 pixel photomultiplier camera which requires precise and regular calibration over a large dynamic range. A system for the optical calibration consisting of a number of ultra-fast and powerful LED pulsers is presented. We calibrate each pixel with up to 2000-3000 photo electrons in three different wavelengths. We achieve an absolute calibration by comparing the signal of the pixels with the one obtained from a darkened photomultiplier thus operated in single photon counting mode. The light flux of the pulsers is cross calibrated by a 1 cm2 PIN dio de, read out via a charge sensitive preamplifier. The PIN dio de, in turn, is calibrated with 59.95 keV photons from an 241 Am source. The telescope is calibrated and flat-fielded in photons instead of photo-electrons.

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