Position of erosion marks on the surface of single-crystal and coarse-grained cathodes after a short-pulse vacuum spark

Nefedtsev, E. V.; Onischenko, S. A.

doi:10.1109/isdeiv46977.2021.9586987

Cited by 4 publications

(9 citation statements)

References 11 publications

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“…In this case, the amplification of the electric field due to the shape of the electrodes and the formation of a dense plasma via a thermal explosion of microprotrusions affect the TLT occurrence. A similar phenomenon is observed in vacuum discharges due to explosive electron emission [31][32][33][34]. TLTs in diffuse discharges in air, argon and, apparently, in other gases, are in contact with both electrodes in contrast to the vacuum discharges…”

Section: Discussionsupporting

confidence: 69%

“…There are pulses in which a large number of TLTs are in contact with one bright spot, and some of TLTs are in contact with the electrode at the periphery of the bright spots. It can be assumed that the appearance of TSCs in our experiments is associated with an increase in the electric field near electrodes with a small radius of curvature, and the appearance of a dense plasma near the electrodes as in vacuum discharges, see [31][32][33][34]. This leads to the departure of micro-and nanoparticles of metal from the electrode surface under the influence of mechanical stresses.…”

Section: Discussionmentioning

confidence: 84%

“…Initial plasma is created due to heating and thermal explosion of micro-inhomogeneities through which a current with a high density flows [27]. As was shown in [31][32][33][34], a decrease in the breakdown voltage in a vacuum cannot be associated only with explosive electron emission from the cathode. Various phenomena must be considered to understand the limitations of the electrical strength of vacuum insulation.…”

Section: Discussionmentioning

confidence: 99%

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Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Тарасенко¹,

Белоплотов²,

Панченко³

et al. 2023

Preprint

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Features of nanosecond discharge development in a non-uniform electric field are studied experimentally. High spatial resolution imaging showed that thin luminous tracks of great length with a cross-section of a few microns are observed against the background of discharge glow in air and argon. It has been established that the detected tracks are adjacent to brightly luminous white spots on the electrodes or to the vicinity of these spots, and are associated with the flight of small particles. It is shown that the traces have various shapes and change from pulse to pulse. The particle tracks may look like curvy or straight lines. In some photos, they can change the direction of movement to the opposite. The particle trace was found to abruptly cut off and a bright flash is visible at the trail break point. The color of the tracks differs from that of the spark leaders, while the bands of the second positive nitrogen system dominate in the gap spectra during the existence of a diffuse discharge. Areas of blue light are evident near the electrodes, as well. Development of glow in the gap during its breakdown is revealed using an ICCD camera. Physical reasons for the observed phenomena are discussed.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Тарасенко¹,

Белоплотов²,

Панченко³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Therefore, the TLT color differs from that of the spark leader Initial plasma is formed due to heating and thermal explosion of micro-inhomogeneitie through which a current with a high-density flows [27]. As was shown in [33][34][35][36], a d crease in the breakdown voltage in a vacuum cannot be associated only with explosiv electron emission from the cathode. Various phenomena must be considered to unde stand the limitations of the electrical strength of vacuum insulation.…”

Section: Discussionmentioning

confidence: 99%

“…There are pulses in which a large number of TLTs are in contact with one bright spot, and some of the TLTs are in contact with the electrode at the periphery of the bright spots. It can be assumed that the appearance of TLTs in our experiments is associated with an increase in the electric field near electrodes with a small radius of curvature, and the appearance of a dense plasma near the electrodes as in vacuum discharges (see, e.g., [33][34][35][36]). This leads to the departure of micro-and nanoparticles of metal from the electrode surface under the influence of mechanical stresses.…”

mentioning

confidence: 96%

Thin Luminous Tracks of Particles Released from Electrodes with A Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

et al. 2023

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Features of the nanosecond discharge development in a non-uniform electric field are studied experimentally. High spatial resolution imaging showed that thin luminous tracks of great length with a cross-section of a few microns are observed against the background of discharge glow in air and argon. It has been established that the detected tracks are adjacent to brightly luminous white spots on the electrodes or in the vicinity of these spots, and are associated with the flight of small particles. It is shown that the tracks have various shapes and change from pulse to pulse. The particle tracks may look like curvy or straight lines. In some photos, they can change their direction of movement to the opposite. It was found that the particle’s track abruptly breaks and a bright flash is visible at the break point. The color of the tracks differs from that of the spark leaders, while the bands of the second positive nitrogen system dominate in the plasma emission spectra during the existence of a diffuse discharge. Areas of blue light are visible near the electrodes as well. The development of glow and thin luminous tracks in the gap during its breakdown is revealed using an ICCD camera. Physical reasons for the observed phenomena are discussed.

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Formation of diffuse and spark discharges between two needle electrodes with the scattering of particles

TARASENKO,

BELOPLOTOV,

PANCHENKO

et al. 2024

Plasma Sci. Technol.

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The development of a nanosecond discharge in a pin-to-pin gap filled with air at atmospheric pressure has been studied with high temporal and spatial resolutions from a breakdown start to the spark decay. Positive and negative nanosecond voltage pulses with an amplitude of tens kV were applied. Time-resolved images of the discharge development were taken with a four-channel ICCD camera. The minimum delay between the camera channels could be as short as 0.1 ns. This made it possible to study the gap breakdown process with subnanosecond resolution. It was observed that a wide-diameter streamer develops from the high-voltage pointed electrode. The ionization processes near the grounded pin electrode started when the streamer crossed half of the gap. After bridging the gap by the streamer, a diffuse discharge was formed. The development of spark leaders from bright spots on the surface of the pointed electrodes was observed at the next stage. It was found that the rate of development of the spark leader is an order of magnitude lower than that of the wide-diameter streamer. Long thin luminous tracks were observed against the background of a discharge plasma glow. It has been established that the tracks are adjacent to brightly glowing spots on the electrodes and are associated with the flight of small particles.

show abstract

Position of erosion marks on the surface of single-crystal and coarse-grained cathodes after a short-pulse vacuum spark

Cited by 4 publications

References 11 publications

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Thin Luminous Tracks of Particles Released from Electrodes with A Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Formation of diffuse and spark discharges between two needle electrodes with the scattering of particles

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