Vol. 33, Issue 2-3, pp. 445-456 (2003)

Abstract

We describe an unusual optical layout of the fluorescence detector telescope which is a part of the Pierre Auger Observatory. The fluorescence detector is a very fast telescope with the relative aperture f_no ~ 0.77 and the large field of view 30×30 degrees. The primary objective for the Auger fluorescence telescope is to measure accurately the longitudinal development profiles of air showers of the cosmic rays above 10 EeV energy.