Multi-Wavelength Calibration, March 2014

B. GOOKIN, A. DOROFEEV, J. BRACK, J. HARTON, Y. PETROV; A.C. ROVERO

Otro; GAP note: Publicación interna del Observatorio Pierre Auger; 2014

The relative spectral eciencies, or multi-wavelength calibrations, of eight telescopes have been measured using a new monochromator-based drum light source with a xenon  asher. The telescopes span the four combinations of mirrors and corrector rings that make up all 27 telescopes. We calibrated two bays at Los Leones and Los Morados and four bays at Coihueco. With the monochromator we were able to scan over the FD acceptance in steps of 5 nm from 270 nm to 430 nm, thereby measuring 33 points. We measured the response from dierent combinations of optical components, and the monochromator setup allowed for completely independent work from previous multi-wavelength calibrations, and the results are consistent with the work published in [1]. There are decreases in eciency below 320 nm, but this region was not measured in [1], and there are decreases in the range of 330 nm to 360 nm on the order of 3% but within the uncertainties of  ~3% in this work and the  ~4.5% in [1]. We also find that the different telescope components do not correlate with any observed dierences in the measured eciencies.