Surface Flashover of Alumina Ceramic Insulators in Vacuum

Cheng, Yanlin; Ao, Xu; Wang, Xiang; Lei, Ying; Chen, Lei; Tang, Binghua

doi:10.1109/deiv.2018.8537150

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Before investigating the ion filtering method, we need to know the characteristics of metal hydride cathode vacuum arc plasma, in particular ion charge state distribution (CSD) and the charge-state-resolved ion kinetic energy. Many papers have revealed that lighter nonmetal ions generated from vacuum arc discharge have smaller kinetic energies than heavier metal ions [11][12][13][14][15][16][17]. In [15][16][17] these data have been carefully measured by time-of-flight mass spectrometry.…”

Section: Ion Filtering Methodsmentioning

confidence: 99%

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Numerical study on ion filtering of titanium hydride cathodic vacuum arc plasma through a double-layer extraction grid

Lan¹,

Long²,

Liang³

et al. 2017

Plasma Sources Sci. Technol.

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A novel method of filtering titanium hydride cathodic vacuum arc ions through a double-layer extraction grid is proposed in this paper. Two grids with different transmission rates are placed very closely, and apertures of the two grids are staggered. Due to the differences of ions in the charge state and kinetic energy, H + can easily go through the second grid after passing the first grid and then be extracted, while most Ti i+ (i=1∼3) are blocked and absorbed by the second grid. Using a 2D electrostatic particle-in-cell simulation, the effectiveness of the double-layer extraction grid on ion filtering is verified. The results show that the fraction of H + can be increased from 39% to 80% by the double-layer grid and the fraction of metal ions decreases significantly. The fraction of H + depends on the distance and the overlap length of the two grids. Besides, in a wide range of extraction voltage, the double-layer grid is effective in increasing the fraction of H + .

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Section: Ion Filtering Methodsmentioning

confidence: 99%

“…Many papers have revealed that lighter nonmetal ions generated from vacuum arc discharge have smaller kinetic energies than heavier metal ions [11][12][13][14][15][16][17]. In [15][16][17] these data have been carefully measured by time-of-flight mass spectrometry. The cathode they used is titanium hydride.…”

Section: Ion Filtering Methodsmentioning

confidence: 99%

Numerical study on ion filtering of titanium hydride cathodic vacuum arc plasma through a double-layer extraction grid

Lan¹,

Long²,

Liang³

et al. 2017

Plasma Sources Sci. Technol.

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show abstract

“…Since the purpose of this paper is not to investigate a specific device, we take hydrogenated titanium for example. The experimental results in [12][13][14] show that H ions and Ti ions emitted from titanium hydride cathode have a great difference in kinetic energy. This characteristic also appears in other metal-nonmetal vacuum arc plasmas [15][16][17][18].…”

Section: Simulation Modelmentioning

confidence: 99%

Metal ion filtering of vacuum arc ion source through an inclined-aperture extraction grid

Lan¹,

Long²,

Liang³

et al. 2019

Plasma Sources Sci. Technol.

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The paper reports a novel method of increasing the fraction of H + ions produced by vacuum arc ion sources with metal hydride cathodes, which applies the ionic selectivity of an inclinedaperture extraction grid to separate and filter heavy metal ions. A simple theoretical model is built to describe the filtering mechanism. Since H + ions and Ti n+ (n=1∼3) ions produced by vacuum arc discharge have a great difference in the ratio of charge state and kinetic energy, H + ions are easy to pass through the inclined-aperture grid, while most of the Ti ions are blocked and absorbed by the grid wall. Using a 2D particle-in-cell simulation, the ionic selectivity of an inclined-aperture extraction grid is demonstrated. The numerical simulation results show that after ion filtering through the extraction grid, the fraction of H + ions is increased from 39% to more than 80%. The increased amplitude of H + ion fraction depends on the thickness of the grid and the angle of grid apertures. In addition, an extraction grid with different aperture angles for the extraction of divergent vacuum arc plasma is proposed.

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Influence of Screening Electrode on Surface Flashover in Atmospheric Environment

Shi

Cheng

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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Surface Flashover of Alumina Ceramic Insulators in Vacuum

Cited by 4 publications

References 10 publications

Numerical study on ion filtering of titanium hydride cathodic vacuum arc plasma through a double-layer extraction grid

Numerical study on ion filtering of titanium hydride cathodic vacuum arc plasma through a double-layer extraction grid

Metal ion filtering of vacuum arc ion source through an inclined-aperture extraction grid

Influence of Screening Electrode on Surface Flashover in Atmospheric Environment

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