Efficiency Enhancement of a Dual-Band Magnetically Insulated Line Oscillator Using a Modulation Cavity

In this article, performance enhancement of a dual-band magnetically insulated line oscillator (DBMILO) using a modulation cavity has been presented. In the proposed design, a modulation cavity has been introduced in between the slow wave structure (SWS) of the output end, which lessens the energy spread of the modulated beam electrons. The impact of the modulation cavity on the transmission characteristics and the operating frequency of the modified DBMILO are investigated through electromagnetic (EM) simulation. The dimensions of the modulation cavity are optimized to ensure approximately the same operating frequency in the modified design. The RF behavior of the proposed and conventional design is examined through the particle-in-cell (PIC) solver code. For the input dc voltage and current of 500 kV and 56 kA, respectively, the output power of the conventional DBMILO provides ~3.6 GW with 12.8% efficiency, whereas the proposed DBMILO with modulation cavity generates ~4.8 GW with 17.1% efficiency. The microwave frequency in both cases is 3.4 and 10.1 GHz. Compared to the conventional DBMILO, the power efficiency of DBMILO with modulation cavity enhances by 33%.