부산대학교 도서관

In earlier research [Phys. Plasmas 27, 103102 (2020)], a split cathode was proposed to avoid pulse shortening of microwave generation in relativistic S-band magnetrons. Experiments confirmed the generation of microwave pulses limited only by the power generator’s pulselength ( $\sim 200$ ns) [J. Appl. Phys. 131, 023301 (2022)]. In the current research, the results of experiments with the same magnetron but powered by a generator producing up to $\sim 500$ -ns-long high-voltage pulses are presented. It is shown that the power and duration of the microwaves depend strongly on the applied magnetic field, anode–cathode gap length, and the applied voltage amplitude. In the experiments, $\sim 400$ -ns, $\sim 100$ -MW microwave pulses were measured. It was also identified that impedance matching between the relativistic magnetron (RM) load and the high-voltage (HV) pulse generator is an important factor in the operation of these devices.