Effects on FD absolute Drum calibration due to camera shadow

A. TAMASHIRO; P. BAULEO, J. BRACK, L. GARRARD, J. HARTON, R. KNAPIK, R. MEYHANDAN; A.C. ROVERO; D. WARNER

Otro; GAP note: Publicación interna del Observatorio Pierre Auger; 2004

We have calculated the correction needed for the absolute calibration constants when a not perfectly uniform Drum is used. For the Drum currently being used, a correction of less than 0.5% is needed for an aperture of 2.2 m, and less than 1.3% for an aperture of 1.7 m, depending on which photomultiplier is being calibrated. These values don't include any aperture projection factor