One-dimensional nonlinear theory for rectangular helix traveling-wave tube

Fu, Chengfang; Wei, Yanyu; Zhao, Bo; Yang, Yudong; Ju, Youlun

doi:10.1063/1.4961915

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…The space charge force between 2 rectangular sheets in a rectangular tunnel is calculated by solving Green's Function for an infinite rectangular tunnel of height (g + h/3). The space charge field due to each rectangular sheet is calculated using Equation (1) [10].…”

Section: Model C -Beam-wave Interaction Analysismentioning

confidence: 99%

Integrated Model for Design of SWS and Beam-Wave Interaction Analysis of a Planar THZ Sheet-Beam TWT

Bansal¹,

Srivastava²,

Gupta³

2019

PIER M

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A computationally efficient, integrated, and dynamic model has been developed for the design of a planar Slow Wave Structure (SWS) and beam-wave interaction analysis of a planar THz Traveling Wave Tube (TWT) with sheet beam. A Staggered Double Vane-Slow Wave Structure (SDV-SWS) is used for its numerous advantages over other types of SWSs. The integrated model determines RF performance of a planar TWT directly from the given beam voltage and center frequency by performing three different tasks, (i) determining geometrical parameters of an SDV-SWS of maximum possible bandwidth and high interaction impedance, (ii) determining RF circuit parameters of an SDV-SWS, and (iii) performing beam-wave interaction analysis of a planar TWT. The model was developed by adopting a numerically computing environment, MATLAB. Also, highly accurate numerical techniques with double precision were used, e.g., Sixth Order Runge Kutta Method was used for electron beam dynamic. The model was used to design and simulate a 0.22 THz Sheet Beam TWT of 100 W output power. The energy balance factor was achieved within ±0.001% over a very wide dynamic range from even 100 dB below saturation to more than 10 dB above saturation. The power growth of the forward wave achieves exactly 1 dB/dB. The program is fast enough for interactive use on a standard computer with a basic configuration. The model has been compared with the published works using a 3D electromagnetic field simulator for demonstrating its accuracy.

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Section: Model C -Beam-wave Interaction Analysismentioning

confidence: 99%

Integrated Model for Design of SWS and Beam-Wave Interaction Analysis of a Planar THZ Sheet-Beam TWT

Bansal¹,

Srivastava²,

Gupta³

2019

PIER M

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“…The space charge force between 2 rectangular discs in a rectangular tunnel is calculated by solving Green's Function for an infinite rectangular tunnel of height (a+h/3), and using eq. ( 1) [18]. Figure 6 shows variation of space charge force between 2 rectangular discs in a rectangular tunnel over one beam wavelength.…”

Section: Planar Rf Slow-wave Structurementioning

confidence: 99%

Design of a 0.22THz, 100W Planar TWT for Ultra Wide Band Wireless Communication

Srivastava

2018

COJEC

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Development activities addressed to 0.22THz centre frequency is of significant importance for ultra wideband communication and remote sensing because of the available atmospheric spectral window over a band from 0.20THz to 0.30THz. 0.22THz planar TWT of output power more than 100W, gain more than 30dB, and bandwidth more than 30GHz is designed for high data rate wireless communication, imaging and remote sensing. Planar TWT is designed using a rectangular sheet electron beam of beam voltage 20kV and beam current 100mA, and of beam size 100m (thickness) x 600m (width). A planar staggered double vane loaded rectangular waveguide slow-wave structure (SDV-SWS) of broad bandwidth, high impedance and low circuit loss is designed for the 0.22THz TWT. Planar structure is used because it is compatible for sheet beam operation and it is also easy to fabricate using MEMS technologies. Large signal analysis code SUNRAY-P, developed to determine RF performance of a planar TWT with sheet beam, is used to design the 0.22THz 100W TWT with sever, couplers and phase velocity taper. WR-3 rectangular waveguide of size 864m x 432m is used for the input and the output couplers.

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One-dimensional nonlinear analysis of sine waveguide traveling-wave tubes

et al. 2019

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A 1D frequency-domain nonlinear model for illustrating the beam-wave interactions of sine waveguide (SWG) traveling-wave tubes (TWTs) was studied. Our model considered space-charge fields and Ohmic losses to make the model closer to practical situations. The sheet beam was split into a series of rectangular electron plates in the axial direction, and the space-charge field was calculated by solving Green's function. The dynamic equations and relativistic equations of motion were solved self-consistently to obtain the nonlinear characteristics of the power saturation, as well as the electron velocity, phase space distributions, etc. A 0.22 THz SWG TWT was used to illustrate and verify the validity of the theoretical model. The output power and gain results were in good agreement with those from the Computer Simulation Technology (CST) 3D particle-in-cell simulation. In addition, the code developed based upon the theoretical model produced faster results than the CST simulation.

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One-dimensional nonlinear theory for rectangular helix traveling-wave tube

Cited by 6 publications

References 24 publications

Integrated Model for Design of SWS and Beam-Wave Interaction Analysis of a Planar THZ Sheet-Beam TWT

Integrated Model for Design of SWS and Beam-Wave Interaction Analysis of a Planar THZ Sheet-Beam TWT

Design of a 0.22THz, 100W Planar TWT for Ultra Wide Band Wireless Communication

One-dimensional nonlinear analysis of sine waveguide traveling-wave tubes

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