Relativistic plasma-beam microwave amplifier

During the injection of a high-current relativistic electron beam into a plasma waveguide, the regime of amplification of a slow plasma wave in a waveguide is realized. For a 30 kW input power at a frequency of 12.7 GHz, a maximum output power of 10 MW is obtained. The effect of the plasma density on the amplification parameters is studied. The value of the gain factor and the operating range of plasma densities agree with the results of calculations based on the linear theory.