Abstract
A low guiding magnetic field facilitates the compactness of high power microwave sources, thus making it more practical. In order to reduce the guiding magnetic field, a focusing cathode is introduced in a Ka-band coaxial transit time oscillator in this paper. Based on the focusing cathode with a large impedance (>100 Ω) coaxial structure, a particle-in-cell simulation is conducted. When the diode voltage is 480 kV and the beam current is 3.62 kA, a microwave with an average power of 800 MW at 31.667 GHz is obtained under a guiding magnetic field of 0.5 T, the corresponding conversion efficiency is 46%, and the saturation time is 25 ns. Meanwhile, the maximum EZ field in the diode region is 350 kV/cm; thus, electron emission beyond the cathode region is avoided. When the guiding magnetic field is 0.5 T and the voltage varies in the range of 430–510 kV, the conversion efficiency is greater than 40%. In addition, when the voltage stays at 480 kV and the guiding magnetic field is in the range of 0.45–1.0 T, the conversion efficiency is also greater than 40%.
Highlights
Ka-band high power microwave (HPM) sources feature a broad application prospect with their development in full swing.1,2 it should be noted the power capacity of the Ka-band HPM source is critically constrained due to working at high frequencies.3,4 when compared to the devices with lower operation frequency, the electron beam transmission channel is narrower
A numerical calculation is applied based on Eq (1), which presents the effect of the guiding magnetic field on the electron beam envelope size
A PIC simulation is conducted based on the structure shown in Figs. 1 and 2, and typical simulation results will be presented in the following parts
Summary
Cite as: AIP Advances 11, 105219 (2021); https://doi.org/10.1063/5.0069577 Submitted: 01 September 2021 • Accepted: 30 September 2021 • Published Online: 29 October 2021 ARTICLES YOU MAY BE INTERESTED IN Efficient current-driven magnetization switching owing to isotropic magnetism in a highly symmetric 111-oriented Mn4N epitaxial single layer AIP Advances 11, 105314 (2021); https://doi.org/10.1063/5.0062253 Enhanced water flow sensing performance based on multi-ciliated structure of ionic polymer–metal composite AIP Advances 11, 105320 (2021); https://doi.org/10.1063/5.0059082 Enhancing mechanical properties of NbZrMo alloy by maximizing configurational entropy from first-principles calculations AIP Advances 11, 105001 (2021); https://doi.org/10.1063/5.0057624 Cite as: AIP Advances 11, 105219 (2021); doi: 10.1063/5.0069577 Submitted: 1 September 2021 • Accepted: 30 September 2021 • Published Online: 29 October 2021
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