6316 20230201155422.0 POSTER-2023-0024 Auchere, F. Pre-flight calibration of the full sun channel of the Extreme Ultraviolet Imager on board Solar Orbiter 2022 2022-09-12 P97 FSI, the Full Sun Imager, is an extreme ultraviolet (EUV) solar imager centered simultaneously on the Fe IX/X 17.4 nm and He II 30.4 nm emission lines, part of the Extreme Ultraviolet Imager (EUI) instrument on-board the Solar Orbiter mission planned to be launched in February 2020. The global efficiency of the instrument over the whole EUV wavelength range from 1 to 100 nm must be determined with the extended spectral response of its subsystems: the entrance pupil, the aluminum entrance filter, the Al/Mo/ SiC dual-band multilayer mirror, and the Al/Zr/Al and Al/Mg/Al focal filters. We will discuss the uniformity of the spectral responses as well as the expected image quality and the effects of stray-light and distortion. Filters and mirror references as well as the whole instrument efficiencies have been measured on beamlines over different wavelength ranges at PTB and SOLEIL synchrotrons. We used the available data coupled with the best EUV simulations for each optical component to determine the most reliable spectral response for FSI. STCE Solar Orbiter EUI Berghmans, D. Rochus, P. Harra, L. Schmutz, W. Schühle, U. BenMoussa, A. Delmotte, F. Dumesnil, C. François, S. Giordanengo, B. Gissot, S. Gottwald, A. Halain, J.-P. Heerlein, K. Hermans, A. Hervier, V. Jérôme, A. Mazzoli, A. Meltchakov, E. Mercier, R. Morinaud, G. Parenti, S. Philippon, A. Rebellato, J. Roulliay, M. Smith, P. J. Stegen, K. Verbeeck, C. Zhang, X. Solar Orbiter 8 david.berghmans@observatoire.be https://blogs.qub.ac.uk/so8belfast/ CPOSTER