Self-modulation may appear on an intense relativistic electron beam(IREB) traversing a two-cavity klystron system. It is caused by the intense relativistic effect. RF output can be obtained without RF input. Based on this mechanism, a new type of high-power microwave source is suggested. The oscillation condition of the intense relativistic election beam, traverse mechanism and PIC simulation are presented. After optimization design, a 800MW output peak microwave power was observed at a frequency of 0.99GHz, while an electron beam of voltage 500kV, current 4kA is injected. The efficiency is about 40%.

intense relativistic electron beam; self-modulation; feedback mechanism; simulation

University of Electronic Science and Technology of China