PIC simulation of mechanism of high power microwave flashover and breakdown on dielectric surface

Ye, 董烨 Dong; Qianhong, 周前红 Zhou; Zhiwei, 董志伟 Dong; Wenyuan, 杨温渊 Yang; Haijing, 周海京 Zhou; Huifang, 孙会芳 Sun

doi:10.3788/hplpb20132504.0950

Cited by 8 publications

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“…Compared to experimental research, more theoretical studies were devoted to exploring the effect of desorbed gas on microwave window breakdown in vacuum [12,[15][16][17][18][19]. Wang used the electrostatic particle-in-cell-Monte Carlo collision (PIC-MCC) model to numerically simulate the window breakdown involving desorbed gas [15].…”

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

“…Cheng investigated numerically the suppression of window breakdown by an external magnetic field when considering the influence of desorbed gas [16]. Under different yields and speeds of desorbed gas molecular, the electrostatic PIC-MCC model was employed by Dong to simulate the changes in the number and mean energy of electrons over time [17][18][19]. This study also discussed the influence of desorbed gas on the spatial distribution of charged particle density and normal electric field.…”

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

“…The breakdown plasma absorbs and reflects the microwave, and leads to changes in the microwave fields. Nevertheless, we still do not have a sufficient understanding of this phenomenon because the electrostatic PIC-MCC model was usually used in previous studies [12,15,[17][18][19]. In this paper, the electromagnetic PIC-MCC model is used to investigate the evolution of dielectric surface breakdown involving desorbed gas.…”

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

See 2 more Smart Citations

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window

ZHAO 赵,

LIU 刘,

WANG 王

et al. 2024

Plasma Sci. Technol.

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The gas desorbed from the dielectric surface has a great influence on the characteristics of microwave breakdown on the vacuum side of the dielectric window. In this paper, the dielectric surface breakdown is described by using the electromagnetic particle-in-cell-Monte Carlo collision (PIC-MCC) model. The process of desorption of gas and its influence on the breakdown characteristics are studied. The simulation results show that, due to the accumulation of desorbed gas, the pressure near the dielectric surface increases in time, and the breakdown mechanism transitions from secondary electron multipactor to collision ionization. More and more electrons generated by collision ionization drift to the dielectric surface, so that the amplitude of self-organized normal electric field increases in time and sometimes points to the dielectric surface. Nevertheless, the number of secondary electrons emitted in each microwave cycle is approximately equal to the number of primary electrons. In the early and middle stages of breakdown, the attenuation of the microwave electric field near the dielectric surface is very small. However, the collision ionization causes a sharp increase in the number density of electrons, and the microwave electric field decays rapidly in the later stage of breakdown. Compared with the electromagnetic PIC-MCC simulation results, the mean energy and number of electrons obtained by the electrostatic PIC-MCC model are overestimated in the later stage of breakdown because it does not take into account the attenuation of microwave electric field. The pressure of the desorbed gas predicted by the electromagnetic PIC-MCC model is close to the measured value, when the number of gas atoms desorbed by an incident electron is taken as 0.4.

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Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

Section: Et Al Et Al Et Al Et Almentioning

confidence: 99%

See 1 more Smart Citation

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window

ZHAO 赵,

LIU 刘,

WANG 王

et al. 2024

Plasma Sci. Technol.

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“…Periodic rectangular and triangular surface have been proved to be effectively suppress secondary electron multipactor and enhance the breakdown threshold by theoretical analysis and experimental study. [4][5][6][7][8] The method of multipactor suppression by way of periodic surface is to change the trajectories of electrons in order to decrease the impact energy to be lower than the first crossover energy e p1 in the secondary yield curve. What is more, the hopping time is restricted to be far smaller than the half of the RF period.…”

Section: Introductionmentioning

confidence: 99%

Tracking multiple generation and suppression of secondary electrons on periodic triangular surface

Chang

Wang

et al. 2013

Physics of Plasmas

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To research the dynamic course of multipactor suppression on the periodically patterned surface, tens of electron collision processes are tracked by numerical calculation. The influences of microwave frequency, amplitude of RF electric field, slope angle, the local field enhancement, and the tilted incident electric field on the multipactor suppression are studied by tracking multi-generation electrons' trajectories, hopping and flight time, collision energy, and secondary emission yield. Meanwhile, the dynamic processes of secondary electrons on the periodic surface are analyzed by particle-in-cell (PIC) simulation. The PIC results are consistent with the analytical results in which the electrons fly reciprocatingly between the slopes and impact on the slopes; the methods of increasing the slope angle, enlarging the RF field, and lowering the frequency in a certain range are helpful to enhance the multipactor suppression steadily and persistently. V C 2013 AIP Publishing LLC. [http://dx.

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Study on the Electromagnetic Radiation Effect of an Aluminum Film in a Vacuum

Fan

Zhang

et al. 2021

IEEE Trans. Plasma Sci.

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PIC simulation of mechanism of high power microwave flashover and breakdown on dielectric surface

Cited by 8 publications

References 0 publications

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window

Effect of desorbed gas on microwave breakdown on vacuum side of dielectric window

Tracking multiple generation and suppression of secondary electrons on periodic triangular surface

Study on the Electromagnetic Radiation Effect of an Aluminum Film in a Vacuum

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