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Proceedings Paper

Optical calibration of the Auger Fluorescence Telescopes
Author(s): John A. J. Matthews
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Paper Abstract

The Pierre Auger Observatory is optimized to study the cosmic ray spectrum in the region of the Greisen-Zatsepin-Kuz'min (GZK) cutoff, i.e.cosmic rays with energies of ~1020eV. Cosmic rays are detected as extensive air showers. To measure these showers each Auger site combines a 3000sq-km ground array with air fluorescence telescopes into a hybrid detector. Our design choice is motivated by the heightened importance of the energy scale, and related systematic uncertainties in shower energies, for experiments investigating the GZK cutoff. This paper focuses on the optical calibration of the Auger fluorescence telescopes. The optical calibration is done three independent ways: an absolute end-to-end calibration using a uniform, calibrated intensity, light-source at the telescope entrance aperture, a component by component calibration using both laboratory and in-situ measurements, and Rayleigh scattered light from external laser beams. The calibration concepts and related instrumentation are summarized. Results from the 5-month engineering array test are presented.

Paper Details

Date Published: 3 March 2003
PDF: 10 pages
Proc. SPIE 4858, Particle Astrophysics Instrumentation, (3 March 2003); doi: 10.1117/12.458013
Show Author Affiliations
John A. J. Matthews, Univ. of New Mexico (United States)

Published in SPIE Proceedings Vol. 4858:
Particle Astrophysics Instrumentation
Peter W. Gorham, Editor(s)

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