Pagonakis IG, Illy S, Ioannidis ZC, Rzesnicki T, Avramidis KA, Gantenbein G, Kobarg T, Piosczyk B, Thumm M, Jelonnek J. Numerical Investigation on Spent Beam Deceleration Schemes for Depressed Collector of a High-Power Gyrotron. IEEE Transactions on Electron Devices [Internet]. 2018;65:2321-2326.