Design of a 340 GHz phase-velocity-taper travelling wave tube

The Journal of Engineering

Hanwen Tian¹  Wei Shao²  Qing Zhou³ 

[1] Beijing Vacuum Electronics Research Institute , No.13, Jiuxianqiao Road, Beijing , People'National Key Laboratory of Science and Technology on Vacuum Electronics , University of Electronic Science and Technology of China , No.4, Section 2, North Jianshe Road, Chengdu , People's Republic of China

关键词: current 0.043 A;    power 30.0 W;    sheet-beam TWT;    particle-in-cell simulation;    phase-velocity-taper travelling wave tube;    staggered double-vane slow wave structure;    size 0.08 mm;    power 10.0 mW;    size 0.3 mm;    transmission coefficients;    electron efficiency;    voltage 21.3 kV;    reflection coefficients;    sheet beam electron gun;    propagation characteristics;    current 43.0 mA;    phase-velocity-taper method;    without-taper structure;    frequency 330.0 GHz to 345.0 GHz;   

DOI  :  10.1049/joe.2018.0110

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Staggered double-vane slow wave structure as the core part of the travelling wave tube (TWT) has been more popular in recent years. However, the electron efficiency of this structure is not enough high for higher frequency, especially THz. In this study, phase-velocity-taper method is utilised for the improvement of TWT's efficiency at 340 GHz. The reflection and transmission coefficients of the whole tube with attenuator show good propagation characteristics over the wide frequency range from 330 to 345 GHz. The particle-in-cell simulation results indicate that the output power can increase about 32% at 340 GHz with respect to that of the without-taper structure. The corresponding electron efficiency is improved from 2.8 to 3.5% by phase-velocity-taper. However, the simulation results also show that the tube can produce over 30 W output power in the frequency range from 330 to 343 GHz with an operating voltage of 21.3 kV, a current of 0.043 A, and an input power of 10 mW. In addition, a sheet beam electron gun with a beam current of 43 mA, a beam voltage of 21.3 kV, and beam waist cross-sectional dimension of 0.3 mm × 0.08 mm is also designed as the particle source of the sheet-beam TWT.

【 授权许可】

CC BY