具有相位速度渐变功能的 Ka 波段径向波束振荡器

IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS
Atif Jameel;Zhanliang Wang;Jibran Latif;Muhammad Khawar Nadeem;Bilawal Ali;Huarong Gong;Qiang Hu;Asif Mehmood Khan;Yubin Gong
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引用次数: 0

摘要

本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Ka-Band Radial Beam Oscillator With Phase-Velocity Tapering
This research article presents a high-power radial oscillator in the Ka-band equipped with a radial sheet electron beam. Radial beam devices outperform traditional devices by offering more extensive interaction spaces and reduced space charge effects. This advantage eliminates the necessity for external magnetic fields, efficiently solving the efficiency issues. The design parameters of the presented device for efficient operation in $\pi $ mode within the Ka-band frequency spectrum are identified through numerical analysis. The baseline model with a constant period is simulated using particle-in-cell (PIC) solver, and importantly, without an external magnetic field. The simulation features a radial beam cathode with an emission area of $2\pi \times 107.5\times 0.7$ mm, generating a current density of 444.37 A/cm2. At 160- and 170-kV beam voltage, the device achieves efficiencies of 31.05% and 38.5%, with peak powers of 104.3 and 137.8 MW, respectively, while maintaining stable signal frequencies around 34.6 and 34.62 GHz. The baseline model’s performance is further enhanced through various phase-velocity tapering techniques, including linear, exponential, and logarithmic methods. The impact of these velocity tapering approaches on beam-wave interaction is analyzed. Linear tapering, in particular, improves output power to 190.61 MW and efficiency to 53.39%, exceeding the constant period model’s 137.8 MW power and 38.5% efficiency. Although exponential and logarithmic methods also boost efficiency, they are less effective than the linear approach. These tapering techniques lead to minor frequency shifts, indicating their structural influence on the oscillator’s performance.
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来源期刊
IEEE Transactions on Plasma Science
IEEE Transactions on Plasma Science 物理-物理:流体与等离子体
CiteScore
3.00
自引率
20.00%
发文量
538
审稿时长
3.8 months
期刊介绍: The scope covers all aspects of the theory and application of plasma science. It includes the following areas: magnetohydrodynamics; thermionics and plasma diodes; basic plasma phenomena; gaseous electronics; microwave/plasma interaction; electron, ion, and plasma sources; space plasmas; intense electron and ion beams; laser-plasma interactions; plasma diagnostics; plasma chemistry and processing; solid-state plasmas; plasma heating; plasma for controlled fusion research; high energy density plasmas; industrial/commercial applications of plasma physics; plasma waves and instabilities; and high power microwave and submillimeter wave generation.
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