Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-25
Proceedings of the 29th International Cosmic Ray Conference, Pune, India (2005)
Astronomy and Astrophysics
Astrophysics
4 pp. To appear in the proceedings of 29th International Cosmic Ray Conference (ICRC 2005), Pune, India, 3-11 Aug 2005
Scientific paper
The stability of the fluorescence telescopes of the Pierre Auger Observatory is monitored with the optical relative calibration setup. Optical fibers distribute light pulses to three different diffuser groups within the optical system. The total charge per pulse is measured for each pixel and compared with reference calibration measurements. This allows monitoring the short and long term stability with respect of the relative timing between pixels and the relative gain for each pixel. The designs of the LED calibration unit (LCU) and of the Xenon flash lamp used for relative calibration, are described and their capabilities to monitor the stability of the telescope performances are studied. We report the analysis of relative calibration data recorded during 2004. Fluctuations in the relative calibration constants provide a measure of the stability of the FD.
Aramo Carla
Brack J.
Caruso R.
D'Urso D.
Fazio D.
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