تحليل، طراحي و شبيه‌سازي يك لامپ مگنترون نسبيتي باند L

Relativistic magnetrons, as one of the important sources of high-power microwave generation, play a key role in applications such as high-power radar systems an‎d electromagnetic effects simulation due to their ability to produce high-power pulsed outputs. The importance of these devices stems from the combination of a relatively simple structure with high output power an‎d the capability to operate under extreme voltage an‎d current conditions. In this study, with the aim of designing an‎d analyzing an L-ban‎d relativistic magnetron, an admittance model is first employed to model the magnetron in order to achieve a more accurate understan‎ding of its behavior. In the next step, based on data an‎d results reported in previous studies, a set of suitable geometric dimensions for the magnetron is selec‎ted to provide a basis for the initial design. Then, to determine optimal operating conditions, physical criteria affecting magnetron performance, including the Hartree an‎d Hull cutoff conditions are applied, an‎d the stable operating region of the device is identified. Subsequently, an analysis of the selec‎ted dimensions is performed to investigate variations in the operating frequency with respect to geometric parameters. After that, the designed device is eva‎luated using numerical simulation based on the particle-in-cell (PIC) method to assess its performance. Considering the limitations of classical power extraction methods, a diffraction output scheme is chosen, which has been reported in recent studies as a more efficient approach. Finally, a relativistic magnetron with a rising-sun anode structure an‎d a transparent cathode, along with a diffraction output, is designed an‎d simulated. Simulation results show that this device operates at a frequency of 1.911 GHz, delivering a peak power of 30 MW with an efficiency of 28.5% at an anode–cathode voltage of 250 kV an‎d an axial magnetic field of 0.076 T. These results indicate that combining a transparent cathode with an appropriate output architecture can achieve a reasonable balance among efficiency, output power, an‎d magnetic field requirements in the L ban‎d.

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ذاكرحسين فيروزه

محسن مداح علي , احمد بخت افروز