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

摘要

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