Design of sheet beam klystron electron optics system with Wiggler focusing style

Planar beams can generate high-power radiation in device like sheet-beam klystrons at high-frequency range. Electron optics system is the key part of the sheet beam klystron. Two-plane Wiggler focusing principle is illustrated in this paper. Elliptical sheet beams with uniform current density are generated by the new-style electron gun geometry which comprises of an elliptically cylindrical cathode and an elliptical focusing electrode. The fill factor of 75% and the beam transmission of 100% are obtained through the center notched Wiggler focusing system with total length and period length of 108 mm and 8 mm respectively. The trajectories are uniformly distributed in the new diamond-shaped collector.