Modeling of wide-band gyrotwystron amplifiers

Summary form only given, as follows. The Naval Research Laboratory is currently investigating wide-band gyro-amplifiers as high power sources for millimeter wave radars. A theoretical model was developed to analyze the cyclotron maser interaction in the gyrotwystron configuration. Recently, the simple bunching model described previously has been improved, and the theory now includes explicit modeling of the buncher cavities. A numerical code, based upon the improved model, was written and a W-band gyrotwystron design with one buncher cavity is presented as an example. Studies show that careful design of the traveling wave section is necessary to minimize the backward wave interaction over a wide bandwidth. In addition, the time-dependent, self-consistent code MAGY has been modified to study gyrotwystrons with multiple buncher cavities. Preliminary results are presented.