Parametric Decay Instabilities during Electron Cyclotron Resonance Heating of Fusion Plasmas, Problems and PossibilitiesS.K. Hansen, S.K. Nielsen, J. Stober, J. Rasmussen, M. Salewski, M. Willensdorfer, M. Hoelzl, M. Stejner and the ASDEX Upgrade TeamEPJ Web Conf., 277 (2023) 01002DOI: https://doi.org/10.1051/epjconf/202327701002