Operation of a Six-Cavity <inline-formula> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula>-Band Relativistic Magnetron at Frequencies in the Range of Its Resonant Response

Abstract

Experimental research on the influence of the frequency characteristic of the anode block on the parameters of relativistic $S$ -band magnetron operation is described. A magnetron with a six-vane anode block was powered by a linear induction accelerator (350 kV, 2.5 kA, and 150 ns). It was found that the shift in the resonance frequency of the magnetron anode block cavity into the range of the frequencies obtained during the magnetron operation is affected by the change in the design of the magnetron output and leads to highly efficient ( $\eta \ge 40\% )$ microwave generation in a relatively narrow magnetic field range. This efficiency remains high during the entire duration ( $\tau \approx 100~\textrm {ns})$ of the microwave pulse, and the decrease in the electric field anode–cathode gap during the fall time of the applied voltage does not cause a drift in the frequency of the generated microwaves.