Design of overmoded interaction circuit for 1 kW, 95 GHz, TWT

Calabazas Creek Research, Inc (CCR) and the University of Wisconsin (UW) used advanced simulation tools to design a 95 GHz TWT providing approximately 1 kW of average power. This output power would be extremely challenging if not impossible using a conventional TWT design because of limitations imposed by the interaction circuit with respect to beam current density and thermal-mechanical stability. However, using an overmoded interaction circuit, we have circumvented these limitations. The program investigated the interaction circuit for its thermal and electrical performance, including the effect of multiple propagating modes, and spurious oscillations. We have also completed the designs for the electron gun and periodic permanent magnet (PPM) structure. Analyses indicate the 1 kW, 95 GHz TWT is feasible.