First measurements of a scintillator-based fast-ion loss detector in reversed Ip/Bt at the ASDEX Upgrade tokamak. - Hidalgo-Salaverri, J.; Rueda-Rueda, J.; Galdon-Quiroga, J.; Cano-Megias, P.; Viezzer, E.; Garcia-Dominguez, J.; Silvagni, D.; Videla-Trevin, M.; Oyola, P.; Ayllon-Guerola, J.; Garcia-Munoz, M.; Happel, T. (Fusion Engineering & Design, 2023)