Statistical Calibration and Background Measurements of the Auger Fluorescence Detector

Details Statistical Calibration and Background Measurements of the Auger Fluorescence Detector Statistical Calibration and Background Measurements of the Auger Fluorescence Detector

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..891g&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

In the framework of the hybrid cosmic ray experiment Auger a precise calibration of the fluorescence detector (FD) is necessary to ensure the energy scale of the measurement. Aging of the photomultiplier tubes (PMT) induce long-term variations of their response; whereas varying light intensities, and power-on and off cycles result in short term changes of gain. Therefore, a simple and fast statistical method was developed to calibrate the gain of all channels simultaneously. Test measurements with the prototype showed that our method is insensitive to drifts of the light intensity and could also be applied to evaluate PMT after-pulses. A simplified version of the method measures continuously the sky background and single stars down to 7th magnitude.

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