Space and time evolution of high-power microwave breakdown on the atmosphere side of the dielectric surface

Shu, Panpan

doi:10.35848/1347-4065/ab8f15

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…1) With the development of HPM technology to high peak power, long pulse and high repetition frequency, the multipactor discharge has become one of the great challenges facing the progress of HPM technology. [2][3][4][5][6][7] Therefore, the research on dielectric multipactor discharge is of great significance for related applications such as HPM systems and space communications.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of single-surface multipactor discharges at different microwave frequencies

Shu¹,

Zhao²

2022

Jpn. J. Appl. Phys.

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The dielectric multipactor discharge in vacuum has become one of the main factors limiting the power capacity of high-power microwave system. In this paper, the particle-in-cell method is used to study the effects of microwave frequency on the single-surface multipactor discharge under the fixed ratio of microwave field to frequency. As the microwave frequency increases, the change in the amplitude of mean electron energy and secondary electron yield is very small, but the number of electrons in a steady state increases linearly. This results in an increase in the delay time for the number of electrons to reach the steady state. The thickness of normalized electron number density decreases with the increase of microwave frequency, because the normal restoring electric field increases linearly with the microwave frequency. Finally, we confirm that the multipactor threshold increases linearly with the microwave frequency, which is consistent with the trend of the experimental results.

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Section: Introductionmentioning

confidence: 99%

Comparative analysis of single-surface multipactor discharges at different microwave frequencies

Shu¹,

Zhao²

2022

Jpn. J. Appl. Phys.

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“…1) A lot of studies concentrated on the determination of the breakdown threshold for a given pulse duration, gas composition, and pressure. [2][3][4][5][6][7][8][9][10] In recent years, the plasma patterns in the microwave breakdown have been captured by a fast camera. [11][12][13] The experiments of Hidaka et al showed that the regular filamentary arrays form in the air breakdown at 110 GHz and high pressures.…”

Section: Introductionmentioning

confidence: 99%

Effect of ambient gas species on microwave breakdown pattern

Shu¹,

Zhao²

2021

Jpn. J. Appl. Phys.

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The air, nitrogen, and helium breakdown caused by microwaves at atmospheric pressure are, respectively, investigated by solving the theoretical model, which consists of Maxwell’s equations and plasma fluid equations. The transport coefficients (e.g. an ionization frequency) are predicted by the Boltzmann equation solver BOLSIG+. The effective diffusion coefficient that describes properly the transition from the free diffusion to the ambipolar diffusion is introduced into the plasma fluid equations. The two-dimensional simulation results show that a filamentary plasma array is produced in the air and nitrogen breakdown, but it disappears completely in the helium breakdown. This is because the transport coefficients and wave scattering by the plasma differ from gas to gas. The simulated plasma patterns in the three different gases agree qualitatively with the experimental results. In addition, the plasma propagation speed in the nitrogen breakdown from the simulations is close to the experimental data.

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Space and time evolution of high-power microwave breakdown on the atmosphere side of the dielectric surface

Cited by 2 publications

References 36 publications

Comparative analysis of single-surface multipactor discharges at different microwave frequencies

Comparative analysis of single-surface multipactor discharges at different microwave frequencies

Effect of ambient gas species on microwave breakdown pattern

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