Design of a 94 GHz photonic bandgap based extended interaction klystron amplifier

A complete design of a 94 GHz extended interaction klystron (EIK) amplifier has been developed at the MIT Plasma Science and Fusion Center. The device utilizes a novel, mode selective photonic bandgap (PBG) structure which enables the use of a modified PBG coupling scheme. Using particle-in-cell simulation, the EIK is predicted to generate 42 dB of gain and 130 W saturated power.