Nanosecond discharge at the interfaces of flat and periodic ripple surfaces of dielectric window with air at varied pressure

Chang, Chao; Verboncoeur, John P.; Fuli, Wei; Xie, Jinlong; Sun, Jun; Liu, Y. S.; Liu, C. L.; Wu, Chunping

doi:10.1109/tdei.2016.006047

Cited by 18 publications

(18 citation statements)

References 40 publications

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“…The calculated plasma pattern is qualitatively consistent with the experimental observation. 14,15,35) The plasma pattern similar to Fig. 3 is also observed at other air pressures, as can be seen at 90 Torr in Fig.…”

Section: Resultssupporting

confidence: 76%

“…Some experimental and theoretical investigations involving the HPM breakdown on the atmosphere side of the dielectric surface have been reported. [13][14][15][16][17][18] Using a setup consisting of both WR284 and WR650 waveguide standards, Edmiston et al measured the breakdown delay times for different dielectric materials, UV illumination, background pressures, and gas types, and gave an empirical relationship between the incident electric field and the breakdown delay time. 13) Using nanosecond-response four-framing intensified-charged-coupled device cameras, Chang et al observed that the plasma develops more intensely at the dielectric-air interface than at other positions.…”

Section: Introductionmentioning

confidence: 99%

“…13) Using nanosecond-response four-framing intensified-charged-coupled device cameras, Chang et al observed that the plasma develops more intensely at the dielectric-air interface than at other positions. 14,15) Foster et al presented a simple model for characterizing the statistics associated with the initiation of gas breakdown, and pointed out that the field induced electron generation, other than standard field emission, plays a dominant role in the statistics. 16) Using the Monte Carlo code, Krile et al revealed that the field detachment is a likely process contributing to seed electrons in the initial stages of breakdown.…”

Section: Introductionmentioning

confidence: 99%

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

Shu

2020

Jpn. J. Appl. Phys.

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The high-power microwave breakdown on the atmosphere side of the dielectric surface leads to the formation of the thin plasma layer. A twodimensional model coupling Maxwell's equations with quasi-neutral plasma fluid equations is used to study the breakdown evolution. We concentrate on the breakdown caused by the incident electric field parallel to the dielectric surface. The results show that the electric field enhancement at the tips of plasmoid in the direction parallel to the dielectric surface accelerates the propagation of the plasma front, while the propagation speed in the perpendicular direction decreases in time since the upstream plasma collapses the local electric field. The difference between the two speeds is responsible for the formation of the thin plasma layer. The effect of air pressure on the breakdown evolution is discussed. The breakdown delay time from simulations as a function of pressure shows the same trend as the experiment.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Shu

2020

Jpn. J. Appl. Phys.

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“…The development of high power microwave sources, such as gyrotrons, has made it possible to create plasmas in free space in gas. [1][2][3][4][5][6][7][8][9][10] The microwave generated plasma has important applications in some fields, including material processing, 11) communication technology, 12) and plasma propulsion. 13) To apply the plasma, the breakdown parameters including the gas temperature, vibrational temperature, electron energy, the propagation speed of plasma front, and electron density need to be well understood.…”

Section: Introductionmentioning

confidence: 99%

A simple method for predicting maximum electron density in microwave air breakdown

Shu

Zhao

2019

Jpn. J. Appl. Phys.

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The electron density in air breakdown reaches the maximum level, when the transmitted electric field decreases to the critical value at which electron ionization balances electron loss. This paper reports a simple method based on the wave equation in nonuniform plasma to fast predict the maximum electron density in air breakdown by plane microwave, when the electron density profile is known. The wave equation is solved numerically by the finite difference method, and the obtained transmitted electric field is consistent with the "exact" solution from the scattered-field finite difference time domain method. When the electron density profile is assumed to be a parabolic distribution in the direction of wave propagation, the effects of air pressure, incident field strength, wave frequency, and plasma thickness on the maximum electron density are investigated. The maximum electron density as a function of air pressure from our simulation shows the same trend as the solutions of Maxwellplasma equations as well as the experiment. © 2019 The Japan Society of Applied Physics i c , the maximum electron density can be predicted as the density at which the ratio of the transmitted electric field to the incident electric field is 0.5. Next we present how to compute the ratio of the transmitted electric field to the incident electric field.

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“…[1] In recent years, the electric field radiated from the aperture antenna reaches several MV/m that can exceed the breakdown electric field at atmospheric pressure. [2,3] Once the air breakdown occurs, the attendant plasma strongly hinders the microwave radiation. This suggests that the radiated power reaches the maximum (or critical) value when the maximum electric field in the near-field region is equal to the breakdown electric field.…”

Section: Introductionmentioning

confidence: 99%

Effect of aperture field distribution on the maximum radiated power at atmospheric pressure

Zhao

Guo

2017

Chinese Phys. B

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The air breakdown in the high-power antenna near-field region limits the enhancement of the radiated power. A model coupling the field equivalent principle and the electron number density equation is presented to study the breakdown process in the near-field region of the circular aperture antenna at atmospheric pressure. Simulation results show that, although the electric field in the near-field region is nonuniform, the electron diffusion has small influence on the breakdown process when the initial electron number density is uniform in space. The field magnitude distribution on the aperture plays an important role in the maximum radiated power above which the air breakdown occurs. The maximum radiated power also depends on the phase difference of the fields at the center and edge of the aperture, especially for the uniform field magnitude distribution.

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Nanosecond discharge at the interfaces of flat and periodic ripple surfaces of dielectric window with air at varied pressure

Cited by 18 publications

References 40 publications

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

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

A simple method for predicting maximum electron density in microwave air breakdown

Effect of aperture field distribution on the maximum radiated power at atmospheric pressure

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