Design and Particle-in-cell Simulation of a Ka-band Extended Interaction Klystron with Five Three-gap Coupled Cavities

Abstract

A Ka-band high gain extended interaction klystron (EIK) with five Hughes-type three-gap coupled cavities is designed and 3D particle-in-cell (PIC) simulation by CST code is performed to calculate the performances of the EIK in this abstract. Under the beam voltage of 14 kV and the current of 1 A, the RF output power is 2.15 kW at the operating frequency of 35 GHz. The corresponding gain and efficiency are 43.78 dB and 15.36%, respectively, and the 3 dB bandwidth reaches 248 MHz.