Theoretic analysis and numerical simulation of dielectric single-surface multipactor discharge

Ye, 董烨 Dong; Zhiwei, 董志伟 Dong; Wenyuan, 杨温渊 Yang

doi:10.3788/hplpb20112307.1917

Cited by 4 publications

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“…In the linear region, the coupling impedance will be increased if we reduce the distance between the electron beam and the wall of the slow-wave structure. The output power of the superradiance could also be improved when the coupling impedance is increased, and at the same time the SR pulse length is decreased [8,9].…”

Section: Discussionmentioning

confidence: 99%

Study of superradiance based on a low-voltage backward wave oscillator

Zhi-cong

Xie

et al. 2013

Chinese Phys. C

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Section: Discussionmentioning

confidence: 99%

Study of superradiance based on a low-voltage backward wave oscillator

Zhi-cong

Xie

et al. 2013

Chinese Phys. C

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“…Previous research indicates that the initial current density could significantly influence SEE. 30 Therefore, our future research will examine the effect of FE current on the electron multiplication process.…”

Section: A Influence Of Microwave Transmission Power On Electron Mult...mentioning

confidence: 99%

Simulation study of secondary electron multiplication on microwave dielectric window

Wang,

et al. 2024

Journal of Applied Physics

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The phenomenon of dielectric breakdown in microwave windows restricts the enhancement of power capacity in high-power microwave systems. This process starts with the secondary electron multiplication, which significantly influences the breakdown threshold. In this study, we developed 3D simulation models for rectangular, circular, and annular windows to examine the secondary electron multiplication on their surfaces using the particle-in-cell method. Through a comparative study, we assessed the effects of various input powers, initial emission current densities from particle sources, and magnetic fields. Our findings reveal that the initial field emission current density, which ranges from 10−9 to 109 μA/cm2, marginally affects electron multiplication. However, increased microwave power (with power density ranging from 0.1 to 18.75 MW/cm2) accelerates this multiplication. Strong magnetic fields and non-uniform electric fields further enhance the electron multiplication process.

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Effects of transverse electromagnetic field distribution in the multipactor discharge on dielectric window surface

Ye¹,

Yang²,

Zhou³

et al. 2013

Acta Phys. Sin.

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By using a P3D3V PIC code programmed by the authors, the multipactor discharge effects on dielectric inner and outer surface under high-power microwave with TE10 mode in the BJ32 rectangular waveguide are numerically studied. The electron spatial distribution, distribution of electric field in the normal direction of the dielectric surface, and electron density spatial distribution are presented. Numerical results could be concluded as follows. For inner surface, the multipacting first occurs in the area with large electric-field of microwave; for the outer surface, multipacting first occurs in the area with small electric-field of microwave. The above phenomena could be explained as follows. Poynting direction of microwave is the same as the outer surface normal direction and opposite to the inner surface normal direction. So the drift in the area with large electric-field of microwave causes electrons easy to move back to inner surface, and so electrons are easy to leave from outer surface. Compared with 1D3V model, in P3D3V model, we have for inner surface multipactor discharge with long oscillator forming time, small secondary electron number, high average electron energy, low incident power of microwave, and low level deposited power; for outer surface, we have multipactor discharge with short oscillator forming time, small secondary electron number, low average electron energy, low incident power of microwave, and low level deposited power. The deposited power is about 1%–2% of incident microwave power both in 1D3V and P3D3V models; while the ratio between deposited power and incident power of microwave has nothing to do with microwave parameters and inner or outer surface.

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Theoretic analysis and numerical simulation of dielectric single-surface multipactor discharge

Cited by 4 publications

References 0 publications

Study of superradiance based on a low-voltage backward wave oscillator

Study of superradiance based on a low-voltage backward wave oscillator

Simulation study of secondary electron multiplication on microwave dielectric window

Effects of transverse electromagnetic field distribution in the multipactor discharge on dielectric window surface

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