Simulation research on C-band high-efficiency coaxial transit-time oscillator
C-band high-power microwave devices have important application prospects in communication,radar and other fields,and the demand for compact and lightweight devices is becoming more and more urgent in the industrial sector.A C-band high-efficiency coaxial transit-time oscillator(CTTO)with three-cavity buncher and dual-cavity extractor is proposed and investigated in theory and 2.5-dimensional particle-in-cell simulations,which is good for high power microwave generation devices at low frequency towards miniaturization and compactness.In order to avoid the transverse electromagnetic mode(TEM)leaking to the diode region,the reflector is designed and adopted in front of the buncher,which also can pre-modulate the beams and lead to the higher conversion efficiency.In this simulation,the typical performance of the CTTO reveals that microwaves with a power of 1.83 GW are generated at a frequency of 6.37 GHz when the beam voltage and current are 458 kV and 9.6 kA respectively,under a guiding magnetic field of 1.05 T.The corresponding power conversion efficiency is as high as 41.6％.
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