Streamer propagation along insulating surfaces

Allen, N.L.; Mikropoulos, Pantelis N.

doi:10.1109/94.775623

Cited by 102 publications

(75 citation statements)

References 5 publications

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“…In summary, it can be said that the values obtained for the discharge development velocity along the ice surfaces are in the same range as results of a study on streamer propagation on different synthetic insulating surfaces [1].…”

Section: Discharge Propagation Velocitysupporting

confidence: 73%

“…Near the anode, positive charges in the form of protons and positive ions are accumulated, whereas, in front of the cathode, an excess of negative ions is present. A study on streamer propagation along insulating surfaces showed that a streamer system consisting of two components appears in the presence of a solid-gas interface [1].…”

Section: Effect Of Voltage Polaritymentioning

confidence: 99%

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Contribution to study of visible discharge initiation and development on the ice surface =

Brettschneider¹

2000

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Section: Discharge Propagation Velocitysupporting

confidence: 73%

Section: Effect Of Voltage Polaritymentioning

confidence: 99%

Contribution to study of visible discharge initiation and development on the ice surface =

Brettschneider¹

2000

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“…To study the influence of the confinement of the discharge by the capillary tube, a first important point is the distance between the dielectric surface and the point of initiation of the discharge. Indeed, Allen et al [Allen and Mikropoulos, 1999;Tan et al, 2007] showed that, close to dielectric surfaces, discharges in air usually propagate in two modes: a fast component over the dielectric surface and a slow one in ambient air. It is important to note that in all these studies, the discharge is generated in a point-to-plane geometry and the dielectric is a plane or a cylinder set on one side of the discharge.…”

Section: Introductionmentioning

confidence: 99%

“…These authors also concluded that the discharge propagates faster over the dielectric surface than through the gas. It is important to note that in both studies the electrodes were in contact [Allen and Mikropoulos, 1999] or at a few millimeters from the dielectric surface [Tan et al, 2007;Sobota et al, 2009]. In this work, we propose to study discharge initiation and propagation in capillary tubes and therefore to study the influence of a cylindrical constraint on the discharge.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the discharge propagation in a capillary tube in air at atmospheric pressure

Jánský¹,

Tholin²,

Bonaventura³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. This paper presents simulations of an air plasma discharge at atmospheric pressure initiated by a needle anode set inside a dielectric capillary tube. We have studied the influence of the tube inner radius and its relative permittivity ε r on the discharge structure and dynamics. As a reference, we have used a relative permittivity ε r = 1 to study only the influence of the cylindrical constraint of the tube on the discharge. For a tube radius of 100 µm and ε r = 1, we have shown that the discharge fills the tube during its propagation and is rather homogeneous behind the discharge front. When the radius of the tube is in the range 300 to 600 µm, the discharge structure is tubular with peak values of electric field and electron density close to the dielectric surface. When the radius of the tube is larger than 700 µm, the tube has no influence on the discharge which propagates axially. For a tube radius of 100 µm, when ε r increases from 1 to 10, the discharge structure becomes tubular. We have noted that the velocity of propagation of the discharge in the tube increases when the front is more homogeneous and then, the discharge velocity increases with the decrease of the tube radius and ε r . Then, we have compared the relative influence of the value of tube radius and ε r on the discharge characteristics. Our simulations indicate that the geometrical constraint of the cylindrical tube has more influence than the value of ε r on the discharge structure and dynamics. Finally, we have studied the influence of photoemission processes on the discharge structure by varying the photoemission coefficient. As expected, we have shown that photoemission, as it increases the number of secondary electrons close to the dielectric surface, promotes the tubular structure of the discharge.

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“…Allen et al [13], [14], [15] studied the propagation of streamers across a parallel-plate air gap bridged by different solid insulators, 12 cm thick (insulator materials included Teflon, nylon and glazed ceramic). The streamer was formed by imposing a positive pulsed voltage on a point electrode located in a small aperture cut in the anode.…”

Section: Past Workmentioning

confidence: 99%

Effect of Dielectric Photoemission on Surface Breakdown: An LDRD Report

Jorgenson¹,

Warne²,

Neuber³

et al. 2003

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The research discussed in this report was conceived during our earlier attempts to simulate breakdown across a dielectric surface using a Monte Carlo approach. While cataloguing the various ways that a dielectric surface could affect the breakdown process, we found that one obvious effect -photoemission from the surface -had been ignored. Initially, we felt that inclusion of this effect could have a major impact on how an ionization front propagates across a surface because of the following argument chain: (1) The photon energy required to release electrons from a surface via photoemission is less than the photon energy required to ionize gas molecules directly. (2) The mean free path of a photon in gas is longer for low-energy photons than for high-energy photons. (3) Photoionization is a major effect in advancing the ionization front for breakdown in gas without a surface, therefore, we know that even high-energy photons can be released from the head of a streamer and propagate some distance through the gas. Our hypothesis, therefore, was that photons with energies near the threshold of photoemission could travel further in front of the streamer before being absorbed than higher-energy photons needed for photoionization, yet the lower-energy photons, with the help of the surface, could still create seed electrons for new avalanches. Thus, the streamer would advance more rapidly next to a surface than in gas alone. Additionally, the photoemission from the surface would add to the electrons in the avalanche and cause the avalanche to grow faster. After some study, however, we are forced to conclude that although photoemission does contribute to avalanche growth at fields near breakdown threshold, secondary electron emission causes electrons to stick to the surface and cancels out the growth due to photoemission. This conclusion assumes a discharge that occurs over a short period of time so that charging of the surface, which could alter its secondary electron emission characteristics, does not occur. This report documents the numerical work we did on investigating this effect and the experimental work we did on pre-breakdown phenomena in gas.

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Streamer propagation along insulating surfaces

Cited by 102 publications

References 5 publications

Contribution to study of visible discharge initiation and development on the ice surface =

Contribution to study of visible discharge initiation and development on the ice surface =

Simulation of the discharge propagation in a capillary tube in air at atmospheric pressure

Effect of Dielectric Photoemission on Surface Breakdown: An LDRD Report

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