Surface Discharge Propagation: The Influence Of Surface Charge

Fouracre, R.A.; Santos, Emerson Roberto; Timoshkin, I. V.; Given, M.J.; MacGregor, S.J.

doi:10.1109/modsym.2006.365178

Cited by 12 publications

(8 citation statements)

References 2 publications

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“…One can cite more particularly, the local distortion of the electric field owing to the effect of the dielectric permittivity of the solid which is higher than that of gas [1,2], the modification of ionisation and attachment coefficients of gas by the presence of the solid dielectric surface [2,3], the accumulation of surface charges [4][5][6][7][8][9] and the dynamic interaction between the surface and the discharge [10][11][12][13]. These mechanisms can significantly affect the development of the surface discharges and thus contribute strongly to the decrease in dielectric strength of the space between the electrodes.…”

Section: Introductionmentioning

confidence: 99%

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AC creeping discharges propagating over solid–gas interfaces

Sadaoui

Béroual

2014

IET Science, Measurement & Technology

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This study is aimed at the characterisation of surface discharges propagating over different solid materials namely glass, bakelite and epoxy resin immersed in three gases and their mixtures (namely SF 6 , N 2 and CO 2 , SF 6 /N 2 and SF 6 /CO 2 ) under AC voltage (50 Hz) in a point-plane electrode system. It is shown that the stopping length of discharges (L f ) increases linearly with the applied voltage and decreases when the gas pressure is increased. L f is longer in CO 2 and N 2 than in SF 6 [L f (N 2 ) > L f (CO 2 ) > L f (SF 6 )]; and the increase of SF 6 content in the investigated mixtures leads to a significant decrease of L f . Also, for a given gas, L f is slightly longer with glass and bakelite than that with epoxy resin indicating that the higher the dielectric constant, the longer the discharge is. Thus, the density of the discharge branches and L f reduce when the thickness of insulators increases and/or their dielectric constant decreases. Such observations evidence the implication of capacitive charge effect and electric field in the development of creeping discharges.

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Section: Introductionmentioning

confidence: 99%

“…Example of creeping discharges obtained under AC voltage with samples of 4 and 6 mm thickness in SF6 Stopping length of creeping discharges against thickness of insulator for glass, bakelite and epoxy resin samples in SF 6 at 0.2 MPa pressure, under AC voltage…”

mentioning

confidence: 99%

AC creeping discharges propagating over solid–gas interfaces

Sadaoui

Béroual

2014

IET Science, Measurement & Technology

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“…The higher speed of growth suggested not only an electric field amplification by the dielectric surface, but also that the surface was acting as a pre-charged source. It has already been shown that the preexisting charge on the dielectric surface eases discharge growth [20].…”

Section: Effect Of the Dielectric Surfacementioning

confidence: 99%

“…The antenna-aided surface discharges can be thought of as guided discharges [20,21]. In guided discharges the presence of the grounded electrode on the far side of the dielectric causes a high electric field amplification.…”

Section: Effect Of the Dielectric Surfacementioning

confidence: 99%

Facilitating breakdown in noble gases at near-atmospheric pressure using antennas

Sobota¹,

Gendre²,

Manders³

et al. 2011

J. Phys. D: Appl. Phys.

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Abstract. Electrical breakdown in near-atmospheric pressure noble gasses requires voltages that are quite high, which is undesirable for a large number of possible applications. Metallic structures (antennas) were used on the outer side of the lamp burner to enhance the electric field locally while keeping the same potential difference across the electrodes. Optical and electrical measurements were performed in an argon or xenon atmosphere at 0.3 or 0.7 bar, with 4 or 7 mm between the electrode tips. We used rod-shaped tungsten electrodes of 0.6 mm in diameter. We found that both active and passive antennas facilitate breakdown, and we demonstrated the differences between the two types and their effects on the breakdown process.

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“…One of the key features of plasma-surface interactions is surface charging by discharge streamers at the gas-solid interface [14]. The deposition of charges on the dielectric surface not only distorts the original electric field [15], but also perturbs the discharge development [16,17]. Celestin et al [18] conducted experimental and numerical investigations that demonstrate the profound impact of deposited surface charges on the discharge structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of transient surface charging during dielectric barrier discharges in air gap in needle-to-plane geometry

Yang

Wang

et al. 2023

J. Phys. D: Appl. Phys.

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Motivated by a deeper understanding of plasma-surface interactions, this study presents experimental investigations into the transient surface charging process during dielectric barrier discharges (DBDs) in an air gap in a needle-to-plane geometry based on a combination of the Pockels method and a custom-designed ultrafast multi-frame imaging system. We realized three-frame observations of transient surface charge distributions, with a remarkable temporal resolution of 3 ns, during positive primary discharges and negative reverse discharges when applying a positive square-wave pulse. During the positive primary discharges at the rising voltage front, following the circular expansion of the streamer over the surface, multiple streamer filaments bifurcate simultaneously from the center, resulting in a branched positive surface charge distribution. Gradient surface charge densities are observed along the channel with higher charge densities at the head, which gradually evolve into a uniform distribution along the channel as the streamers approach stagnation. No lateral expansion of positive charges is observed across the channel under the present condition. In the case of negative reverse discharges occurring at the falling edge of the voltage pulse, the neutralization of residual positive surface charges and the accumulation of negative surface charges occur simultaneously in the central region. The deposited negative surface charges exhibit a progressively expanding circular distribution characterized by increasing charge density and radius. The propagation dynamics of surface streamers and the fields induced by surface charges are investigated and discussed based on the spatio-temporal surface charge measurements. Further study suggests that the surface streamer is not driven by the over-accumulation of surface charges, but rather by the space charge field above the dielectric. The presented quantitative measurements can be used for detailed validation of DBD simulations and offer deeper insights into plasma-surface interactions.

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Surface Discharge Propagation: The Influence Of Surface Charge

Cited by 12 publications

References 2 publications

AC creeping discharges propagating over solid–gas interfaces

AC creeping discharges propagating over solid–gas interfaces

Facilitating breakdown in noble gases at near-atmospheric pressure using antennas

Experimental study of transient surface charging during dielectric barrier discharges in air gap in needle-to-plane geometry

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