Abstract
The linear and nonlinear behavior of the gyrotron backward wave oscillator (gyro-BWO) were theoretically analyzed. The numerical model of the gyro-BWO showed highly current-sensitive field profiles and contrasting linear and saturated behaviors. While the saturated profile is strongly affected by the energetics in the internal feedback loop, the linear field extends over the entire structural length. The difference in behavior was shown to affect such basic properties of the gyro-BWO as the start-oscillation current, efficiency, and power scaling.