Verification of the results of numerical simulations of a high-power pulsed L-band magnetron in experimental conditions

Kubara Lamina is working on the development of a new type of pulsed-power magnetron with megawatts output power operating in the L-band. An important part of the design work are computer simulations of electromagnetic interactions with an electric charge. In order to get the most reliable results, the task was carried out with the help of specialized calculation software from two independent producers - CST Studio Suite and MAGIC Tool Suite. The results obtained with the help of both programs were similar, but there were differences between them resulting from the specific features of the software. The differences concerned the time needed to create an electron spokes in the interaction area between the cathode and anode of the tube as well as the threshold voltage at which the generation of high frequency oscillation began. On the basis of numerical simulations, the optimal geometrical dimensions of individual details were obtained and the magnetron prototype was created. The tube was subjected to laboratory tests under dynamic conditions. To ensure proper input power parameters, a dedicated impulse modulator powered from supercapacitors batteries was constructed. The energy of the electromagnetic wave generated during the dynamic operation of the device was absorbed in the waveguide ended with high power load. The test results obtained under the experimental conditions allowed to verify the structure of the model designed using simulation software. Tests in the available power range of the power supply confirmed very good compatibility of the tube parameters with the results of electromagnetic simulations. An additional advantage of carrying out the simulation was the shortening of the design process, because the first model of the device already worked in accordance with the technical assumptions.