Simulation Investigation of Reversed Cherenkov Radiation Amplifier

A metamaterial-based reversed Cherenkov radiation amplifier (RCRA) is proposed. Simulation results of the dispersion characteristics of the meta material slow-wave structure (MSWS) of the RCRA show that its fundamental wave exhibits reversed Cherenkov radiation properties. Further, the beam-wave interaction of the RCRA is simulated with an input power of 8 W, an axial magnetic flux density of 0.2 T, and beam voltage and beam current of −38 kV and 0.45 $A$ , respectively, using CST PIC code. The simulation results show that the saturated output power is 388 W at 2.291 GHz, the saturated gain is 16.86 dB, the electronic efficiency is 2.27%, and the 3 dB operating bandwidth of the device is about 7 MHz (2.289 GHz - 2.296 GHz). The above results indicate that the RCRA investigated here can effectively amplify high-frequency signals, which confirms the feasibility of the amplifier based on the reversed Cherenkov radiation mechanism. Meanwhile, RCRA's MSWS has a diameter of only $0.32\lambda (\lambda$ is the wavelength in free space), enabling the miniaturization of the device.