Abstract
In this article, a bifrequency magnetically insulated line oscillator (BFMILO) with ridge-disk-loaded vanes has been investigated in order to increase the device efficiency. The influence of ridged slow wave structure (RSWS) on electromagnetic (EM) characteristics of the BFMILO has been studied in the absence of an electron beam with CST Eigenmode solver. Cold (without electron beam) EM simulation demonstrates the impact of the ridge at the disk tip on the resonance frequency, phase velocity, and coupling impedance of the ridged BFMILO (RBFMILO). It shows that the RSWS can significantly enhance the coupling impedance of the RBFMILO, improving overall power efficiency. The CST particle-in-cell (PIC) simulation has been carried out to assess the RF performance of the RBFMILO. For the input dc voltage of 500 kV and the current of 45 kA, the PIC simulation detects a high-power microwave (HPM) with two frequencies of 3.35 and 3.60 GHz, generating a collective peak RF power of 4.2 GW. The peak power conversion efficiency of the device is 18.7%.
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