Global models for radio-frequency ion thrustersPatrick Dietz, Andreas Reeh, Konstantin Keil, Kristof Holste, Uwe Probst, Peter J. Klar and Chris VolkmarEPJ Techn Instrum, 8 1 (2021) 10DOI: https://doi.org/10.1140/epjti/s40485-021-00068-5