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Spectral calibration of the fluorescence telescopes of the Pierre Auger Observatory

Journal Article · · Astroparticle Physics
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We present a novel method to measure precisely the relative spectral response of the fluorescence telescopes of the Pierre Auger Observatory. Here, we used a portable light source based on a xenon flasher and a monochromator to measure the relative spectral efficiencies of eight telescopes in steps of 5 nm from 280 nm to 440 nm. Each point in a scan had approximately 2 nm FWHM out of the monochromator. Different sets of telescopes in the observatory have different optical components, and the eight telescopes measured represent two each of the four combinations of components represented in the observatory. We made an end-to-end measurement of the response from different combinations of optical components, and the monochromator setup allowed for more precise and complete measurements than our previous multi-wavelength calibrations. We find an overall uncertainty in the calibration of the spectral response of most of the telescopes of 1.5% for all wavelengths; the six oldest telescopes have larger overall uncertainties of about 2.2%. We also report changes in physics measureables due to the change in calibration, which are generally small.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
European Union (EU); USDOE; USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25): National Science Foundation (NSF)
Contributing Organization:
Pierre Auger Collaboration
Grant/Contract Number:
AC02-07CH11359; FG02-99ER41107; SC0011689
OSTI ID:
1390185
Alternate ID(s):
OSTI ID: 1495845
Report Number(s):
FERMILAB-PUB--17-355; arXiv:1709.01537; 1621775
Journal Information:
Astroparticle Physics, Journal Name: Astroparticle Physics Journal Issue: C Vol. 95; ISSN 0927-6505
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (10)

Multi-wavelength calibration procedure for the pierre Auger Observatory Fluorescence Detectors journal May 2009
Absolute photometric calibration of large aperture optical systems journal March 2004
Properties and performance of the prototype instrument for the Pierre Auger Observatory
  • Abraham, J.; Aglietta, M.; Aguirre, I. C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 523, Issue 1-2 https://doi.org/10.1016/j.nima.2003.12.012
journal May 2004
The offline software framework of the Pierre Auger Observatory
  • Argirò, S.; Barroso, S. L. C.; Gonzalez, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 580, Issue 3 https://doi.org/10.1016/j.nima.2007.07.010
journal October 2007
The surface detector system of the Pierre Auger Observatory
  • Allekotte, I.; Barbosa, A. F.; Bauleo, P.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 586, Issue 3 https://doi.org/10.1016/j.nima.2007.12.016
journal March 2008
Spectrally resolved pressure dependence measurements of air fluorescence emission with AIRFLY
  • Ave, M.; Bohacova, M.; Buonomo, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 597, Issue 1 https://doi.org/10.1016/j.nima.2008.08.052
journal November 2008
The fluorescence detector of the Pierre Auger Observatory
  • Abraham, J.; Abreu, P.; Aglietta, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 620, Issue 2-3 https://doi.org/10.1016/j.nima.2010.04.023
journal August 2010
The Pierre Auger Cosmic Ray Observatory
  • No authors listed
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 798, p. 172-213 https://doi.org/10.1016/j.nima.2015.06.058
journal July 2015
Absolute calibration of a large-diameter light source journal May 2013
Observation of the Suppression of the Flux of Cosmic Rays above 4 × 10 19     eV journal August 2008

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