volume | PIER Journals

2019-12-21

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

Aakash Bansal,

Dr. Aakash Bansal

Microwave Tubes Division

CSIR - Central Electronics Engineering Research Institute

India

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Vishnu Srivastava,

Dr. Vishnu Srivastava

Central Eletronics Engineering Research Institute

India

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Richa Gupta

Dr. Richa Gupta

Maharaja Surajmal Institute of Technology

India

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Progress In Electromagnetics Research M, Vol. 87, 179-187, 2019

doi:10.2528/PIERM19102304

Abstract

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 a SDV-SWS of maximum possible bandwidth and high interaction impedance, (ii) determining RF circuit parameters of a SDV-SWS, and (iii) performing beam-wave interaction analysis of a planar TWT. The model was developed by adopting 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 100W 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 was achieved with 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 3D electromagnetic field simulator for demonstrating its accuracy.

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Aakash Bansal, Vishnu Srivastava, and Richa Gupta, "Integrated Model for Design of SWS and Beam-Wave Interaction Analysis of a Planar THz Sheet-Beam TWT," Progress In Electromagnetics Research M, Vol. 87, 179-187, 2019.
doi:10.2528/PIERM19102304

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