Design and Recent Status of the NRL Low Voltage Folded Waveguide Four Beam Mini-TWT

In this paper we present a practical design of Multiple Beam Traveling Wave Tube (MB-TWT) with Folded Waveguide (FW) Slow Wave Structure (SWS) operating at low voltages, 6.2 kV, with output power about 300 Wand central frequency of 29 GHz completed by using NRL large signal design codes [1], [2]. Stability analysis with respect to excitation of high order spurious modes has been done with NRL 3D PIC code Neptune [3].