Thompson, R. Jöhren, J. Vollbrecht, V. Hannen, M. Vogel. Laser cooling of externally produced Mg ions in a Penning trap for sympathetic cooling of highly charged ions. Physical Review A 87, 033423 (2013) [...] 69 R. Cazan, C. Geppert, W. Nörtershäuser, and R. Sánchez. Towards sympathetic cooling of trapped ions with laser-cooled Mg+ ions for mass spectrometry and laser spectroscopy. Hyperfine Interactions 196 [...] P02015 arxiv.org/abs/1111.6948v1 S. Bharadia, M. Vogel, D. Segal, R. Thompson. Dynamics of laser-cooled Ca+ ions in a Penning trap with a rotating wall. Appl. Phys. B. 107, 1105 (2012). dx.doi.org/10.