Cylindrical cavities coupled together by long circumferential slots in their common walls have been shown to be a suitable circuit for wideband high-power traveling wave tube amplifier. A single sever tube has been designed for the following characteristics: Beam Voltage ......................100 kv Beam Current ...................... 60 amp Small Signal Gain ................. 30 db Small Signal Bandwidth ............

Peak Power ........................ > 1.5 Mw Details of the construction and the characteristics of the various components will be given. The slot staggering introduced to break up the slot resonance pass-band (backward) has been completely effective and shows the adequacy of this technique for future work.