Kappatou, A., Angioni, C., Pütterich, T., Lerche, E., Sips, A. C. C., Dunne, M., Neu, R., Giroud, C., Kim, H.-T., Challis, C., Hobirk, J., Nunes, I., Tsalas, M., McDermott, R. M., Manas, P., Dux, R., Frassinetti, L., Saarelma, S., Menmuir, S., Bernert, M., Viezzer, E., ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society, EUROfusion MST1 Team, & JET Contributors (2021). Energy confinement degradation of deuterium plasmas with helium seeding. Talk presented at 47th EPS Conference on Plasma Physics. Virtual. 2021-06-21 - 2021-06-25.