Nonlinear analysis of beam-wave interaction in a planar THz travelling-wave tube amplifier

Srivastava, V.

doi:10.1080/09205071.2017.1374217

Cited by 18 publications

(4 citation statements)

References 21 publications

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“…Apart from transistors or triodes, vacuum field emission electronic devices have applications as diodes, travelling‐wave tube (TWT), oscillators, klystrons and magnetrons, and gyrotrons for high‐frequency (RF, GHz, and THz) and high‐efficiency applications.…”

Section: Utilization (Applications)mentioning

confidence: 99%

Electron Emission Devices for Energy‐Efficient Systems

Nirantar

Ahmed

Bhaskaran

et al. 2019

Advanced Intelligent Systems

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Artificial intelligence platforms, high-speed computation, and data handling systems increasingly need energy-efficient systems. Electron emission was fundamental to the development of transistors and electronics over seven decades ago. This technology has a renewed emergence and includes implications in diverse fields ranging from electronics, telecommunication, defense, space exploration, medical science, and material science to televisions and displays. For such a vital field, a critical review of theories, current research directions, applications, and future prospects is invaluable. Herein, the ongoing research directions adopted to enhance the emitter performance are reviewed and the relative degree of their success is compared. This is supported by an overview of key electron emission, transport mechanisms, and ways to tune a particular mechanism for energy-efficient applications. The diverse range of applications in this field, with a particular focus on electronics, is outlined. Exciting current developments in electron field emission that could revolutionize the electronic industry with a resurgence of nanoscale field emission transistor in the air medium are also discussed. Figure 2. Representation of different electron emission mechanisms: a) Comparison of thermionic emission, Schottky emission, FN tunnelling, and direct tunnelling with schematic energy band diagram. b) Typical thermionic emission plot. c) Typical Schottky plot. (b,c)Reproduced with permission. [3]

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Section: Utilization (Applications)mentioning

confidence: 99%

Electron Emission Devices for Energy‐Efficient Systems

Nirantar

Ahmed

Bhaskaran

et al. 2019

Advanced Intelligent Systems

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“…For beam-wave interaction analysis of a THz planar TWT with a sheet beam, a one-dimensional nonlinear model is developed on the approach as presented for the SUNRAY-1D large-signal modeling [9]. A number of modifications in the SUNRAY-1D model were incorporated for higher numerical accuracy without much increase in simulation time.…”

Section: Model C -Beam-wave Interaction Analysismentioning

confidence: 99%

“…Figure 5 also shows SCF for equivalent cylindrical discs. For a cylindrical beam, the technique proposed in [9] is used. The dimensions of a cylindrical beam and cylindrical tunnel are selected for the same cross-section areas as that of the sheet beam and rectangular tunnel, respectively.…”

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

Self Cite

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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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“…This indicates good accuracy of our analytical approach of determining initial design parameters of a unit cell of staggered double-vane rectangular waveguide SWS of a THz TWT. The designed 0.22THz TWT with sheet beam was analysed for its RF performance using in-house developed SUNRAY-large-signal analysis code [16,17]. In the developed SUNRAY code for planar TWT with sheet beam, the rectangular sheet beam of one beam wavelength is sliced into number of uniform rectangular discs, as shown in Figure 5.…”

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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Nonlinear analysis of beam-wave interaction in a planar THz travelling-wave tube amplifier

Cited by 18 publications

References 21 publications

Electron Emission Devices for Energy‐Efficient Systems

Electron Emission Devices for Energy‐Efficient Systems

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

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