Study on Ballistic Bunching in Frequency Multiplying Distributed Interaction Gyroklystron Amplifier

We re-classify this two-stage and highly tapered gyro-device as distributed interaction two-cavity gyroklystron since this device has a finite interaction length at each operating frequency in a highly tapered waveguide. Here the ballistic bunching theory previously driven is used for the estimation of the maximum bunching distance for each operating frequency. The third harmonic multiplying scheme is applied to two-stage tapered waveguides with a rectangular cross-section. The large-orbit electron beam is adopted operating at the beam voltage and current of 30kV and 1A, respectively. Theoretically predicted maximum bunching length is compared with the drift length from the Lareg-Signal-Theory code simulation. And they are compared with the interaction length of the circuit