A W-Band Radial Klystron Amplifier

A W-band klystron amplifier with three-gap radial extended interaction cavity is proposed. The structure consists of an input-cavity, two idle-cavities and an output-cavity, all of which are three-gap radial extended interaction cavities. The field distribution characteristics of the three-gap extended interaction cavity have been studied. The PIC simulation results show that the average output power of the structure is 623W, corresponding a gain of 35.7 dB and an electron efficiency of 5.2% at 94.03GHz, where a radial electron beam (15kV, 0.8A) and 0.6T radial focusing magnetic field are applied.