650 GHz traveling wave tube amplifier

Kory, C.L.; Read, Michael; Booske, John H.; Ives, L.; Venkataramanan, G.; Marsden, David; Sengele, S.

doi:10.1109/icimw.2008.4665623

Cited by 13 publications

(4 citation statements)

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“…By increasing the operating frequency (up to terahertz frequency band) the minimum working current density of traditional terahertz VERS systems increases dramatically, typically to hundreds of A/cm 2 . The minimum current density for some electron tubes, such as Ledatrons, Travelling Wave Tubes (TWTs), Reflex Klystrons, and Backward Wave Oscillators (BWO) are 330A/cm 2 , 70A/cm 2 , 216A/cm 2 , 874A/cm 2 , respectively [15][16][17]. Despite significant research efforts, such large minimum current densities continue to plague the development of traditional VERS systems.…”

Section: Introductionmentioning

confidence: 99%

A High-Current-Density Terahertz Electron-Optical System Based on Carbon Nanotube Cold Cathode

Yuan

et al. 2020

IEEE Trans. Electron Devices

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A high-current-density terahertz electronoptical system based on a carbon nanotube (CNT) cold cathode has been investigated in order to solve notable mode competition in high order harmonic gyrotrons. Simulation results show that a near-axis electron beam can be generated, with beam current of 160mA at an accelerating voltage of 23.5kV. The source supports electron beam with velocity ratio of 1.1 and a guiding center radius of 57 µm. A narrow beam spatial distribution is evidenced by adjusting control anode voltage, satisfying the need for high operating current density in slow wave devices. The current density of the electron beam is up to 620 A/cm 2 and the velocity ratio is 0.44, with parallel energy accounts for 84% of the total energy.

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Section: Introductionmentioning

confidence: 99%

A High-Current-Density Terahertz Electron-Optical System Based on Carbon Nanotube Cold Cathode

Yuan

et al. 2020

IEEE Trans. Electron Devices

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“…As a key component of the TWT, SWS largely determine the device performance. 1,2 Some investigation results of the TWTs based upon various SWSs were carried out in recent years, such as folded waveguide, 3 ladder, 4 staggered double vane structure, 5 grating, 6 double corrugation rectangular waveguide, 7 etc. Nevertheless, as the frequency increases, these TWT SWSs still meet challenges such as large conductivity losses and reflection.…”

Section: Introductionmentioning

confidence: 99%

Full-wave analysis of the high frequency characteristics of the sine waveguide slow-wave structure

et al. 2017

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A selection rule for transitions in PT-symmetric quantum theory AIP Advances 7, 085001 (2017); 10.1063/1.4991032Multi-tests for pore structure characterization-A case study using lamprophyre AIP Advances 7, 085204 (2017) A theoretical model for calculation of the high frequency characteristics of the sine waveguide slow-wave structure (SWS) is proposed. The formulas of dispersion and interaction impedances of the hybrid modes are obtained by combining the Helmholtz equation with the appropriate boundary conditions. Using the full wave analysis method, it is proved that the periodic structures with a half-period shift followed leads to a pairwise closing of passbands characteristic of adjacent mode. The sine waveguide SWS for 0.22THz traveling wave tube (TWT) is chosen as an illustrative example to verify the validity of the theoretical model, and the calculation results of the dispersion curve and interaction impedance curve are consistent with the HFSS simulation results. In addition, the influences of dimensions of sine waveguide on the high frequency characteristics of +1 st spatial harmonic wave are investigated by numerical calculation. The study indicates that the appropriate SWS parameters are helpful for improving the bandwidth and increasing output power of TWT.

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“…The conventional slow-wave structures (SWS) which contain the coupled helix structures [3], ladder [4] and folded waveguide [5] are popular used in TWTs. These conventional slow-wave structures have been researched decades of years, which possess significant advantages such as wide operating bandwidth, high efficiency and power output.…”

Section: Introductionmentioning

confidence: 99%

A novel omega-shaped microstrip slow-wave structure for 60-GHz traveling-wave tube

Liao

Wei

et al. 2013

2013 International Workshop on Microwave and Millimeter Wave Circuits and System Technology

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In this paper, a novel microstrip meander-line slow-wave structure (SWS) is proposed for using in V-band traveling-wave tube (TWT). The new omega-shaped micro strip meander-line slow-wave structure has higher interaction impedance by contrasting analysis of the conven-tional U shaped microstrip meander-line SWS. The transmission characteristics, dispersion characteristic, coupl-ing impedance and beam-wave interaction are simulated by utilizing the simulation software HFSS and CST. The calculation of beam-wave interaction indicated that, at a beam current of 0.1 A and a beam voltage of 7.1 kV, the new microstrip meander-line SWS is capable of delivering more than 28.5 W output power. And its interaction efficiency reaches 12.3% with a transient 3dB bandwidth of 5 GHz (ranging 57.5 GHz to 62.5 GHz).Index Terms -Microstrip meander-line slow-wave structure, dispersion characteristic, coupling impedance, beam-wave interaction.

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650 GHz traveling wave tube amplifier

Cited by 13 publications

References 0 publications

A High-Current-Density Terahertz Electron-Optical System Based on Carbon Nanotube Cold Cathode

A High-Current-Density Terahertz Electron-Optical System Based on Carbon Nanotube Cold Cathode

Full-wave analysis of the high frequency characteristics of the sine waveguide slow-wave structure

A novel omega-shaped microstrip slow-wave structure for 60-GHz traveling-wave tube

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