PIC Model of a Relativistic Two-Cavity Reflex Klystron with a Magnetic Mirror

A concept and design of a relativistic two-cavity reflex klystron with a magnetic mirror has been proposed. A 2.5D particle-in-cell (PIC) computer model of a relativistic two-cavity reflex klystron with a magnetic mirror has been created on the basis of the KARAT PIC code. The model takes into account the supply of an external microwave from the master oscillator and allows self-consistent calculation of the electron dynamics and the output characteristics of the klystron. Comparative modeling of a relativistic two-cavity reflex klystron with a magnetic mirror and a relativistic two-cavity transit klystron without a magnetic mirror has been performed. It has been shown that the spectral characteristics of both klystrons are close to each other. The output power of the reflex and transit klystrons has been compared. It has been found that the output power of the reflex klystron is approximately 1.4 times greater than that of the transit klystron. The effect of the magnetic mirror position on the value of the generated microwave power of the reflection klystron has been studied.