Modeling of T-shaped vane loaded helical slow-wave structures

Zhu, Xiao Fang; Yang, Zirong; Li, Bin

doi:10.1109/tps.2006.874847

Cited by 12 publications

(2 citation statements)

References 15 publications

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“…The relativistic traveling-wave tube (TWT) is an important high-power source of broad-band high-power microwave generation at centimeter wavelengths, developed over the last several decades [1][2][3][4][5]. One of the common features of a TWT is a slow-wave structure (SWS) such as a dielectric material, disk-loaded waveguide, or a helix [6][7][8][9][10]. The physical mechanism of operation is that the SWS reduces the phase velocity of the electromagnetic wave to synchronize it with the electron beam velocity, so that a strong interaction between the two can take place.…”

Section: Introductionmentioning

confidence: 99%

Plasma effect in tape helix traveling-wave tube

Saviz

Salehizadeh

2014

J Theor Appl Phys

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A linearized relativistic field theory of a plasma-loaded helix traveling-wave tube is presented for a configuration where a solid electron beam propagate through a sheath helix enclosed within a loss-free wall in which the gap between the helix and the outer wall is filled with a dielectric. Numerical study of the effect of plasma density on the phase velocity and growth rate has been done. Numerical results show that the plasma have different behaviors in different density limits.

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Section: Introductionmentioning

confidence: 99%

Plasma effect in tape helix traveling-wave tube

Saviz

Salehizadeh

2014

J Theor Appl Phys

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“…The relativistic traveling-wave tube (TWT) is an important high-power microwave apparatus, developed over the last several decades [1][2][3][4][5]. One of the common features of a TWT is a slow-wave structure (SWS) such as a dielectric material, disk-loaded waveguide, or a helix [6][7][8][9][10]. The physical mechanism of operation is that the SWS reduces the phase velocity of the electromagnetic wave to synchronize it with the electron beam velocity so that a strong interaction between the two can take place.…”

Section: Introductionmentioning

confidence: 99%

The effect of beam and plasma parameters on the four modes of plasma-loaded traveling-wave tube with tape helix

Saviz

2014

J Theor Appl Phys

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Field theory is applied to analyze the behavior of the electromagnetic wave in the presence of a solid electron beam and magnetized plasma-loaded tape helix travelingwave tube. The obtained dispersion relation implicitly includes azimuthal variations and all spatial harmonics of the tape helix. Results indicate that the frequency and the phase velocity of (X bp-X p) and (O bp-X p) modes increase with cyclotron frequency and for (O bp-O p) and (X bp-O p) modes decrease. In the strong magnetic field limit, the maximum growth rate and frequency of all modes are constant at different values of cyclotron frequency and beam energy. If the plasma density increases, the frequency and phase velocity of four modes will increase. The maximum growth rates of the four modes in the lower plasma density are equal and for higher values of plasma density the (O bp-X p) mode has greatest value. The phase velocity and the frequency of (X bp-X p) with (X bp-O p) modes and (O bp-O p) with (O bp-X p) modes are coinciding with each other and for first case increase with beam density, but for latter decrease. The maximum growth rate of (O bp-O p) mode and the maximum frequency of (X bp-X p) mode have highest values as a function of the electron beam density.

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Study on Effects of Different Metallic Vane-Loaded Helix Slow-Wave Structures in Traveling-Wave Tubes

Yang

Zhang

Cai

et al. 2009

J Infrared Milli Terahz Waves

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The effects of different metallic vane-loaded helix slow-wave structures of a traveling-wave tube are proposed based on the analysis of the Fourier expansions of the exterior region with metallic vanes. The influences of the metallic vanes dimensions on the phase velocity and interaction impedance are considered in detail. The computed data is compared with the reference data in the 0−16 GHz frequency range with a good consistency. The analytical results reveal that the method of using Fourier expansions can contribute effectively to the reducing of the error between the theoretical and experimented data (around 1.2%). By analyzing the computed results, the performances of the helix slowwave structure, with T-shaped metallic vanes are superior to the sector-shaped with the same designed parameters. Adjustments can be made to the outer radius of T-shaped metallic vanes which then control the dispersion relation showing either negative or positive, and it is similar to sector-shaped vanes by adjusting its inner radius. And with increasing the distance between the helix and metallic vanes, the dispersion characteristics and interaction impedance of the helix slow-wave structure with T-shaped/sector-shaped metallic vane are all improved.

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Modeling of T-shaped vane loaded helical slow-wave structures

Cited by 12 publications

References 15 publications

Plasma effect in tape helix traveling-wave tube

Plasma effect in tape helix traveling-wave tube

The effect of beam and plasma parameters on the four modes of plasma-loaded traveling-wave tube with tape helix

Study on Effects of Different Metallic Vane-Loaded Helix Slow-Wave Structures in Traveling-Wave Tubes

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