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Xplore Articles related to Vacuum Electronics

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Study on 140 GHz double-ridge-loaded folded waveguide slow wave structure with big electron tunnel

2016 IEEE International Vacuum Electronics Conference (IVEC), 2016

This paper presents 140 GHz double-ridge-loaded folded waveguide (FWG) slow wave structure (SWS) with big electron tunnel, whose high frequency characteristics and transfer characteristics have been calculated. Compared with 140 GHz folded waveguide slow wave structure without double ridge-loaded under the same structural parameters, the double-ridge-loaded folded waveguide slow wave structure has higher interaction impedance, which can strengthen the beam-wave ...


Permanent magnet focusing system for MM waveband magnetron with axial cathode support

2018 IEEE International Vacuum Electronics Conference (IVEC), 2018

We report composite permanent magnet and iron pole-piece focusing system for 8 mm waveband (35 GHz) cold-cathode magnetrons operating in the "spatial harmonics" regime. This reduces required values of magnetic induction to affordable figures and allows one to design permanent magnet focusing systems that have simple system assembly, reasonable mass-dimensional characteristics, and low cost impact.


Parametric 3D Modeling of Low Perveance Elleptical Electron Beams for Devices of THz Range

2018 International Conference on Actual Problems of Electron Devices Engineering (APEDE), 2018

This report presents the results of 3D modeling of an electron optical system with low perveance electron elliptical beams. The comparison of triple elliptical beams with continuous sheet and elliptical beams has been conducted. The studied systems have a triode design with an anode potential of 20 kV and a grid potential of 950 V. The total current of electron ...


A novel double V-shaped winding microstrip meander-line slow wave structure for millimeter-wave TWTs

2016 IEEE International Vacuum Electronics Conference (IVEC), 2016

We present a novel double V-shaped winding microstrip meander-line slow-wave structure (SWS) for traveling-wave tubes (TWTs) in this paper. The proposed structure evolves from a V-shaped winding microstrip meander-line. The radio- frequency characteristics of the above-mentioned structures are calculated. Numerical results from high frequency characteristics calculation are given and analyzed. It has been illustrated that, compared with the V-shaped winding ...


Development of 220 GHz and 340 GHz TWTs

2016 IEEE 9th UK-Europe-China Workshop on Millimetre Waves and Terahertz Technologies (UCMMT), 2016

Compact traveling wave tubes (TWTs) operating at 220 GHz and 340 GHz respectively are being developed. The 220 GHz TWT is designed to produce 10 W output power and has achieved 0.2 W. The 340 GHz TWT is designed to produce 1 W output power and has not been demonstrated yet. This paper describes the development of the TWTs' components ...


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  • Study on 140 GHz double-ridge-loaded folded waveguide slow wave structure with big electron tunnel

    This paper presents 140 GHz double-ridge-loaded folded waveguide (FWG) slow wave structure (SWS) with big electron tunnel, whose high frequency characteristics and transfer characteristics have been calculated. Compared with 140 GHz folded waveguide slow wave structure without double ridge-loaded under the same structural parameters, the double-ridge-loaded folded waveguide slow wave structure has higher interaction impedance, which can strengthen the beam-wave interaction. What's more, the transfer characteristics are pretty good.

  • Permanent magnet focusing system for MM waveband magnetron with axial cathode support

    We report composite permanent magnet and iron pole-piece focusing system for 8 mm waveband (35 GHz) cold-cathode magnetrons operating in the "spatial harmonics" regime. This reduces required values of magnetic induction to affordable figures and allows one to design permanent magnet focusing systems that have simple system assembly, reasonable mass-dimensional characteristics, and low cost impact.

  • Parametric 3D Modeling of Low Perveance Elleptical Electron Beams for Devices of THz Range

    This report presents the results of 3D modeling of an electron optical system with low perveance electron elliptical beams. The comparison of triple elliptical beams with continuous sheet and elliptical beams has been conducted. The studied systems have a triode design with an anode potential of 20 kV and a grid potential of 950 V. The total current of electron beams is a 93 mA. Results of 3D modeling show that using of electron optical system forming triple elliptical beams in THz devices permits to achieve a high current transmission through a beam tunnel of a slow-wave structure with a dimension of 140×2500 ¼m2and provide interaction with the higher transverse mode of three RF field variations.

  • A novel double V-shaped winding microstrip meander-line slow wave structure for millimeter-wave TWTs

    We present a novel double V-shaped winding microstrip meander-line slow-wave structure (SWS) for traveling-wave tubes (TWTs) in this paper. The proposed structure evolves from a V-shaped winding microstrip meander-line. The radio- frequency characteristics of the above-mentioned structures are calculated. Numerical results from high frequency characteristics calculation are given and analyzed. It has been illustrated that, compared with the V-shaped winding microstrip meander-line, the novel structure proposed in this paper has higher interaction impedance and the same cold bandwidth over the working frequency band.

  • Development of 220 GHz and 340 GHz TWTs

    Compact traveling wave tubes (TWTs) operating at 220 GHz and 340 GHz respectively are being developed. The 220 GHz TWT is designed to produce 10 W output power and has achieved 0.2 W. The 340 GHz TWT is designed to produce 1 W output power and has not been demonstrated yet. This paper describes the development of the TWTs' components and some test results of two TWT prototypes.

  • Modeling Oscillations in TWTs by Using the Tesla-Family of 2D Large-Signal Codes

    As a rule, codes that operate in the time domain, such as Particle in Cell (PIC) codes, are a more natural choice as a tool to explore the stability of beam-driven devices. However, the extensive computer resources required for PIC simulation as compared with those needed for hybrid codes such as TESLA1, motivate the development presented here. We report recent advances in the development of the TESLAfamily of 2D large-signal codes (such as TESLA-FW2or TESLA-Z3, for example), with a focus on algorithms to model self-oscillations in TWT amplifiers. The TESLA codes operate essentially in the frequency domain, making it a challenge to find unstable modes without prior knowledge of their frequency.

  • Design of helix slow-wave structure for ultra-wideband traveling-wave tube with low gain fluctuation

    This paper describes a fan-shaped metal-loaded helix slow-wave structure (SWS) to develop ultra-wideband traveling-wave tube with low gain fluctuation. The electromagnetic characteristics and beam-wave interaction of this structure are calculated. The simulation results show that the helix TWT gain is more than 42dB and the signal gain fluctuation of the TWT is less than 2.5dB in a frequency range from 15 to 35 GHz. In addition, the maximum output power can reach 199 W at 21 GHz, corresponding to the maximum electronic efficiency is 16.6%.

  • Improvements of MTSS for Simulation of Millimeter and Terahertz Vacuum Electronic Devices

    Microwave Tube Simulator Suite (MTSS) is a fully featured tightly integrated software package for microwave tube analysis and design. Recently, some improvements have been made to improve the performance and to make it suitable for simulation of millimeter wave and terahertz vacuum electronic devices. In the paper, the improvements are introduced and a Terahertz folded waveguide traveling wave tube is simulated. The comparison between MTSS and CST PS simulation is performed and the improvements are validated.

  • Study of 220GHz relativistic BWO with phase velocity taper

    In this paper, a 220GHz relativistic backward wave oscillator (RBWO) with phase velocity taper is studied. The RBWO with phase velocity taper consists of five parts, including two parts of slow wave structures (SWS) which have different dispersion characteristics, the cathode, the resonant reflector and the output waveguide. The single-grating rectangular waveguide is selected as the SWS. Based on an RBWO without phase velocity taper, another part of SWS with different dispersion characteristic is added to build an RBWO with phase velocity taper. With the phase velocity taper, the output power of RBWO achieves 9.68MW at 220GHz, which increases 20% by the RBWO without phase velocity taper.

  • Nanofabrication with lanthanum hexaboride (LaB6) for nanoscale vacuum electronics

    We present the first nano- and microfabrication of vacuum microelectronic components incorporating lanthanum hexaboride (LaB6), a refractory low work function material with high electron emissivity. We design novel fabrication processes which yield ultra-low fill factor (<;10%) nanoscale grids of 50 nm width on LaB6 electrodes and nanoscale LaB6 tips over ~mm2 scales. Finally, we briefly discuss future applications in which such nanostructures will be applicable and ongoing R&D; challenges with nanoscale grids.



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