Analysis on surface charging of insulator prior to flashover in vacuum

Liu, Yuan-Shing; Zhang, Guanjun; Zhao, Wen-Bin; Zhang, Yan

doi:10.1016/j.apsusc.2004.02.038

Cited by 13 publications

(3 citation statements)

References 12 publications

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“…Studies and models for electron-irradiated insulators have been reported intensively by Sessler, et al [4] and Liu et al [5] and references therein. The phenomenon that involves surface charging, discharging and surface breakdown (flashover) may damage the instrument and lead to material degradation.…”

Section: Introductionmentioning

confidence: 98%

Novel characterization technique by using an SEM

Sutjipto

Jufriadi

Muhida

et al. 2008

2008 23rd International Symposium on Discharges and Electrical Insulation in Vacuum

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Charging and discharging phenomenon on the surface of materials can be found in plasma display panel, spacecraft charging, high voltage insulator, etc. This report gives a simple explanation on this phenomenon. A scanning electron microscope was used not only as a tool to produce energetic electron beam to charge an insulator without metallic coating and to produce a surface discharging (surface breakdown/flashover) but also to observe the visible charging and discharging on the sample surface. A model of electric field distribution on the surface was developed in order to explain charging and discharging phenomena. Since charging and discharging process involves incubation time, therefore this process can be used to characterize or evaluate the insulation property of materials under electron bombardment.

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Section: Introductionmentioning

confidence: 98%

Novel characterization technique by using an SEM

Sutjipto

Jufriadi

Muhida

et al. 2008

2008 23rd International Symposium on Discharges and Electrical Insulation in Vacuum

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show abstract

“…There is a widely accepted theory [4][5][6][7][8] that the ‰ashover phenomena in vacuum initiate from theˆeld emission at CTJ (Cathode Triple Junction), pass through the process of the SEEA (Secondary Electron Emission Avalanche) and complete in desorption gas layer. The SEEA is regarded as a major reason of outgassing.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Surface Insulation Strength of Machinable Ceramic Material under Pulsed Voltage in Vacuum

Zhang

Zhao

et al. 2007

J. Vac. Soc. Jpn.

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Ceramic material has been widely used as insulator in vacuum. Their high hardness and brittle property brings some di‹culty in the application. A new kind of machinable ceramic was invented recently. The ceramic can be machined easily and accurately after being sintered, which provides the possibility of making the insulator withˆne and complicated conˆguration. The paper studies its surface insulation performance and ‰ashover phenomena under pulsed excitation in vacuum. The ceramic samples with diŠerent crystallization parameters are tested under the vacuum level of 10-4 Pa. The machinable ceramic behaves better surface insulation performance than comparative the Al 2 O 3 and glass sample. The eŠect of crystallization level on the trap density and ‰ashover current is also presented. After ‰ashover shots many times, the surface microscopic patterns of diŠerent samples are observed to investigate the damage status, which can be explained by the thermal damage mechanism.

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“…The discharge current can result in permanent damage to the dielectric and severely undermine the device's performance. Such process affects a wide range of applications [8][9][10][11][12][13][14][15], such as the radio-frequency particle accelerators [16][17][18][19][20], antennas in satellites [21][22][23], and high-power microwave systems [24][25][26][27]. * Authors to whom any correspondence should be addressed.…”

mentioning

confidence: 99%

Oblique streaming waves observed in multipactor-induced plasma discharge above a dielectric surface

Jin,

Chen,

Sun

et al. 2024

Plasma Sources Sci. Technol.

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In a recent discovery (Phys. Rev. Lett. 129, 045001, 2022), streaming waves were found in multipactor-induced plasma discharges. However, due to the limitations of a 1D simulation setup, these waves displayed only transverse dynamics. In this letter, an extended 2D particle-in-cell/Monte Carlo model is used to simulate multipactor-induced plasma discharge above a dielectric surface. The results reveal that the streaming waves are not solely transverse but oblique, featuring both transverse and longitudinal components of the wave vector. Furthermore, it is identified that the sheath-accelerated field-emission electrons, rather than the previously reported secondary emission electrons, predominantly cause the excitation of streaming waves. The simulated wave spectrum achieves an excellent agreement with the theoretical dispersion relation. The identification of oblique streaming waves provides new insights into multipactor physics and is anticipated to inspire novel mitigation strategies for multipactor-induced breakdown processes.

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Analysis on surface charging of insulator prior to flashover in vacuum

Cited by 13 publications

References 12 publications

Novel characterization technique by using an SEM

Novel characterization technique by using an SEM

Investigation on Surface Insulation Strength of Machinable Ceramic Material under Pulsed Voltage in Vacuum

Oblique streaming waves observed in multipactor-induced plasma discharge above a dielectric surface

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