Le projet SNDICE : réalisation d'un dispositif optoélectronique pour l'étalonnage photométrique de l'imageur grand champ MegaCam au CFHT

摘要

The photometric calibration of the wide field imager MegaCam at the CFHTis the dominant systematic uncertainty for the measurement of the cosmological parameters with type Ia supernovae performed by the SNLS team.This thesis descibes the SNDICE project, an illumination source made of 24 LEDsaiming at characterizing at the permil level the response of MegaCam to an illumination. The device has been constructed and characterized at the LPNHE prior to being installed at the CFHT.The first part of the manuscript describes the spectro-photometric calibration of SNDICE. It shows the high stability of the source and discuss in detail the various systematics of the calibration. The second part describes the analysis of in-situ illuminations of MegaCam with SNDICE. The analysis emphasises on its specificities : an highly stable, partial illumination of the primary miror which allow unique study of reflections on the optics and monitoring of MegaCam electronic stability.