3-D Fast Nonlinear Simulation for Beam–Wave Interaction of Sheet Beam Traveling-Wave Tube

Tian, Hanwen; Lu, Zhaolin; Shao, Wei; Wang, Zhanliang; Ma, Jialu; He, Tenglong; Gong, Huarong; Duan, Zhaoyun; Tang, Tao; Wei, Yanyu; Feng, Jinjun; Gong, Yubin

doi:10.1109/ted.2018.2889652

IEEE Trans. Electron Devices

2019

DOI: 10.1109/ted.2018.2889652

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3-D Fast Nonlinear Simulation for Beam–Wave Interaction of Sheet Beam Traveling-Wave Tube

Hanwen Tian

Zhaolin Lu

Wei Shao

et al.

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Cited by 6 publications

(1 citation statement)

References 17 publications

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“…This paper proposes a time domain self-consistence solution to improve FTDNA-3D algorithm for simulating the beam-wave interaction including the effect of ohmic losses and reflections of SWSs. Compared with [1], the two models share almost identical method for electric field computation, while the new model considers the losses and reflections. The models of magnetic field, losses and reflections are presented in this paper originally.…”

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confidence: 99%

Improved Model for Beam–Wave Interaction With Ohmic Losses and Reflections of Sheet Beam Traveling Wave Tubes

Tian

Shi

Wang

et al. 2021

IEEE Trans. Electron Devices

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In this paper, an improved model for the beam-wave interaction of sheet beam in traveling wave tubes (TWTs) considering ohmic losses and reflections is presented. The ohmic losses are obtained by field analysis and equivalent method. The space charge magnetic field is derived from the active Helmholtz's equation. An algorithm to obtain the S-matrix by the equivalent circuit method is presented. The relativistic Boris method is applied to accelerate macroparticles. The exchanged power is computed by the work the electromagnetic field applied to the macroparticles. The theoretical model is applied for validation to a G-band staggered double vane TWT and validated by comparison with CST Particle Studio and simulations without losses and reflections. The convergence of this algorithm is also discussed. The simulation time of the model is substantial faster than 3D Particle-in-cell (PIC) simulations.  Index Terms-beam-wave interaction, losses, reflections, sheet beam TWT I. INTRODUCTIONHMIC losses and reflections of slow wave structures (SWSs) are important parameters for a reliable and accurate simulation of TWTs. This is particularly important at millimeter wave (30 -300 GHz) and Terahertz (THz, 300 GHz -1000 GHz) frequencies due to the small dimensions that affects the fabrication accuracy and the decreasing skin depth that requires high quality surface roughness to keep losses low.The 3D fast time-domain nonlinear algorithm (FTDNA-3D) presented in [1] is a PIC-method-based approach for

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mentioning

confidence: 99%

Improved Model for Beam–Wave Interaction With Ohmic Losses and Reflections of Sheet Beam Traveling Wave Tubes

Tian

Shi

Wang

et al. 2021

IEEE Trans. Electron Devices

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Multiple-beam and double-mode staggered double vane travelling wave tube with ultra-wide band

Zhang

Ruan

Fahad

et al. 2020

Sci Rep

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This paper presents design, fabrication and cold test of an ultra-wide band travelling wave tube (TWT) with planar alignment multiple pencil beams. The fundamental double-mode of staggered double vane slow wave structure (SDV-SWS) rather than the only one mode are put forward and adopted to match with the same electron beam to increase the bandwidth greatly. Simultaneous planar alignment multiple pencil beam tunnels are designed to improve interaction impedance and then to enhance output power, gain, efficiency, growth rate. The transmission performance of a two-stage 51-period SDV-TWT in G-band with structure attenuator between two sections shows that it indeed has an ultra-wideband performance from 81 to 110 GHz. By using computer numerical control machining, the SDV-SWS was manufactured and a detailed cold test was conducted. Good agreement is found at the wide band, where S21 is above − 5 dB and S11 is below − 10 dB. 3D PIC simulations with double-mode multiple-beam SDV-TWT within total length of 70 mm show that it can get a nearly 2120 W peak output power, a 42.5 dB corresponding gain and a 10.7% electron efficiency at 94 GHz with a 22.1 kV beam voltage and a 3 × 0.15A beam current. The 3 dB bandwidth of our double-mode SDV-TWT can achieve about 29 GHz.

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Sheet Electron Optical System for a 1.03-THz Traveling-Wave Tube

Yin

Yang

et al. 2022

IEEE Electron Device Lett.

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The electron optical systems (EOS) play a vital role in vacuum electron devices (VED). This letter reported the design and experiments of the sheet EOS for the 1.03 THz traveling wave tube (TWT). A high-current-density sheet electron beam (SEB) electron gun generating up to 20.3-mA at 22.4-kV is designed, based on the requirements of this TWT. Due to the very high operating frequency, more than 1 THz, the miniature tunnel and beam waist with a dimension of 0.05 mm * 0.148 mm and 0.025 mm * 0.114 mm, respectively, will lead to a very high beam current density (906.9 A/cm 2 ). Therefore, a 1-Telsa uniform magnetic system is designed, to ensure such a high-current-density SEB passes through the 27-mm tunnel. Finally, the primary experiments indicate that 7.56-mA current reaches the collector.

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3-D Fast Nonlinear Simulation for Beam–Wave Interaction of Sheet Beam Traveling-Wave Tube

Cited by 6 publications

References 17 publications

Improved Model for Beam–Wave Interaction With Ohmic Losses and Reflections of Sheet Beam Traveling Wave Tubes

Improved Model for Beam–Wave Interaction With Ohmic Losses and Reflections of Sheet Beam Traveling Wave Tubes

Multiple-beam and double-mode staggered double vane travelling wave tube with ultra-wide band

Sheet Electron Optical System for a 1.03-THz Traveling-Wave Tube

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