Multi-wavelength Calibration Procedure for the Pierre Auger Observatory Fluorescence Detectors

TL;DR

This paper introduces a calibration method for the Pierre Auger Observatory Fluorescence Detectors that measures their spectral response across multiple wavelengths with a 5% uncertainty, enhancing measurement accuracy.

Contribution

It presents a novel end-to-end calibration procedure using a xenon flasher and notch-filters to determine the spectral response of the detectors.

Findings

Achieved a 5% overall uncertainty in spectral response measurement.

Calibrated at wavelengths of 320, 337, 355, 380, and 405 nm.

Demonstrated an effective method for detector calibration in cosmic ray observatories.

Abstract

We present a method to measure the relative spectral response of the Pierre Auger Observatory Fluorescence Detector. The calibration was done at wavelengths of 320, 337, 355, 380 and 405 nm using an end-to-end technique in which the response of all detector components are combined in a single measurement. A xenon flasher and notch-filters were used as the light source for the calibration device. The overall uncertainty is 5%.