The exploratory phase for Lifetime Position 7 in the Cosmic Origins Spectrograph FUV channel

In anticipation of a move to a seventh Lifetime Position on the FUV channel of the Cosmic Origins Spectrograph (COS) in 2025, we have conducted exploratory work to model the instrument performance over the full range of possible positions for the spectra on the detector. This effort includes (1) optical modeling of the spectrograph; (2) creating simulated science spectra and evaluating the resolving power and other spectral properties at a range of positions; (3) evaluating the detector properties at potential lifetime positions while considering mechanical limitations of the hardware; and (4) reserving sufficient space for later Lifetime Positions. We have used this information to formulate preliminary plans for moving to the next position, which includes identifying which observing modes should be adjusted, and providing our initial thoughts on future Lifetime Positions.