Hansen, S. K., Nielsen, S. K., Stober, J., Rasmussen, J., Stejner, M., & ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society (2018). Observation and Modelling of the Onset of Parametric Decay Instabilities during Gyrotron Operation at ASDEX Upgrade. Talk presented at 20th Joint Workshop on Electron Cyclotron Emission (ECE) and Electron Cyclotron Resonance Heating (ECRH) (EC-20). Greifswald. 2018-05-14 - 2018-05-17.