A Ku-band magnetically insulated transmission line oscillator is investigated numerically and experimentally for the first time. The magnetically insulated transmission line oscillator (MILO) is optimized in particle-in-cell simulation software. Reflect cavities are introduced to reduce the field intensity between cathode and anode. In the particle-in-cell simulation, the Ku-band MILO generates microwave with power of 2.48 GW and frequency of 12.5 GHz, whereas the voltage is 478 kV and the current is 48.9 kA. Based on the structure in simulation, an experiment system is designed and the measure method and system are introduced. After the collector improved, Ku-band microwave with frequency of 12.9 GHz is generated, whereas the voltage is 539 kV and current is 57 kA. The peak power is 89 MW and pulse width is 15 ns. The radiation mode is TM01 mode.
Index Terms-High power microwave (HPM), Ku-band, magnetically insulated transmission line oscillator (MILO).
Coaxial disk-loaded waveguide has been widely used in magnetically insulated transmission line oscillators (MILO). Although TM00 mode is assumed to be its main mode, the asymmetric mode might be excited by slight asymmetry of the structure, asymmetric emission of the beam, or both. So the research on asymmetric mode in coaxial disk-loaded waveguide is necessary. The general eigen equation with both symmetric and asymmetric modes in coaxial disk-loaded slow-wave structures is theoretically analyzed. Then, a HEM11 mode working MILO is designed and a tentative experiment is carried out to test its performance. Employing an electron beam of about 480 kV and 39 kA, HEM11 mode working MILO generates a high power microwave output of about 1.2 GW with 40 ns pulse duration at 1.98GHz. The power conversion efficiency is about 6.5% and the generated microwave mode is TE11 in the coaxial output region.
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