Comparison between controlled non-adiabatic and E×B concepts for gyrotron multistage depressed collectorsChuanren Wu, Ioannis Gr. Pagonakis, Stefan Illy, Gerd Gantenbein, Manfred Thumm and John JelonnekEPJ Web Conf., 149 (2017) 04005DOI: https://doi.org/10.1051/epjconf/201714904005