can be combined with the heavy ion storage ring facilities at GSI and FAIR for precision spectroscopy. Combining XUV laser spectroscopy with the advantages of heavy ion storage rings, such as well-defined [...] well-defined Doppler-shift in combination with exotic ions/nuclei in well-prepared quantum states, will enable unique research beyond today’s state-of the art. In this context, a proof-of-principle experiment [...] targeting XUV-photoionization of C+ ions based on a laser-driven table-top XUV source, has been proposed, granted beam time, and conducted by the SPARC collaboration at CRYRING in 2019 and 2021 (E129)