Background Intercoupled phase-locked technology provides a feasible technical solution for coherent power synthesis in magnetrons. However, intercoupled phase-locked magnetrons often suffer from the coexistence of the desired operating mode and various interference modes, which impact the stability and efficiency of the system.
Purpose This paper aims to realize the experimental identification of intercoupled phase-locked modes in MW-level magnetrons, so as to provide an experimental basis for mode suppression and array design.
Methods Leveraging the distinct azimuthal field distributions of different modes in the anode cavity, a mode identification scheme based on the perturbation method is proposed. By applying perturbations at the openings of each small-sector cavity, the frequency shift values before and after perturbations are measured to obtain the azimuthal frequency shift curves for different modes. Additionally, the standard deviation of the measurement results was calculated to evaluate the data dispersion.
Results The results show that the standard deviation for each mode at each measurement point remains below 0.0025 GHz, indicating high consistency and reliability. The frequency shift laws of the three modes measured align well with the azimuthal field amplitude curves obtained from the eigenmode simulations.
Conclusions The experimental identification of intercoupled phase-locked modes in MW-level magnetrons is successfully realized. The proposed method is universal and can be extended to other intercoupled magnetron systems. The cold-test results provide guidance for hot-test operation, mode competition suppression, and coupling structure optimization, which lays a foundation for the design and performance improvement of magnetron arrays based on intercoupled phase-locked technology.
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