A 50 kW peak power, 4 kW average power, moderate confined flow, PPM focused, X-band TWT

Summary form only given, as follows. A 50-kW peak power, 4.0-kW average power periodic permanent magnet (PPM)-focused, X-band, coupled-cavity traveling-wave tube (TWT) has been developed. The tube exceeds this requirement by a considerable margin and has been tested to 10% duty to a minimum of 55 kW of peak power and 5.5 kW of average power across the operating band from 9.2 to 9.7 GHz. This performance represents the state-of-the-art in PPM-focused coupled-cavity TWTs. The tube achieves this performance by several innovations. It uses a novel confined flow-focusing scheme to minimize electron beam interception and also has improved cooling of the tube body. The RF circuit has separately cooled servers, a cooled output waveguide, and a cooled output window.