Remote streamer initiation on dielectric surface

Kusýn, Lukáš; Synek, Petr; Becker, Markus M.; Hoder, Tomáš

doi:10.1088/1361-6595/abe4e2

Cited by 5 publications

(14 citation statements)

References 86 publications

(174 reference statements)

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“…A similar phenomenon, namely the formation of a bidirectional ionization wave, was observed in the recently published work [49], which presents the dynamics of ionization waves in a sinusoidally driven HV (15.43 kHz, 25 kV pp peakto-peak) surface barrier discharge in atmospheric-pressure air. The authors observed, using sub-nanosecond-resolved optical emission spectroscopy based on the time-correlated singlephoton counting technique, a remote streamer initiation on dielectric surface.…”

Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

“…An important distinguishing feature of [49] compared to the present work is that it was carried out in a repetitively pulsed SDBD, where an important role should be played by the charge remaining on the dielectric after previous pulses (see review [12]). This complicates the analysis of the results [49]. In addition, in [49] all the main processes occur at microsecond times, that is, at times longer than gas-dynamic rarefaction of channels (for a typical radius of the channel R ≤ 300 µm).…”

Section: Discussionmentioning

confidence: 99%

“…In the negative half-period, a bi-directional ionization wave formed at the border of the streamer zone, similar to surface stems and bi-directional ionization waves in the present work. The velocities of the ionization waves in [49] were equal to (1-2) × 10 7 cm s −1 . Upon reaching the HV electrode, the cathode-directed ionization wave formed a cathode spot of increased intensity, which, in turn, initiated formation of a highly conductive plasma channel.…”

Section: Discussionmentioning

confidence: 99%

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Fine structure of streamer-to-filament transition in high-pressure nanosecond surface dielectric barrier discharge

Ding¹,

Jean²,

Попов³

et al. 2022

Plasma Sources Sci. Technol.

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The ﬁne structure of a streamer–to–ﬁlament transition in a single–shot high–voltage nanosecond surface dielectric barrier discharge (nSDBD) in molecular nitrogen at pressure $P = 6$~bar was studied with the help of ICCD microimaging. An intermediate discharge structure, existing for only a few nanoseconds, was observed in the time interval between two discharge modes: streamer discharge, with a typical electron density of $n_e \sim 10^{15}$~cm$^{-3}$, and ﬁlamentary discharge, with $n_e \sim 10^{19}$~cm$^{-3}$. The structure was observed for both polarities of the high–voltage electrode. The structure can be brieﬂy described as a stochastic appearance of thin channels propagating a bit faster than the main ionization front of merged surface streamers, transforming in a few nanoseconds in a bi–directional ionization wave. One wave, which we associate with a feather–like structure in optical emission, propagates further away from the high–voltage electrode, and another, a backward wave of emission, propagates back towards the edge of the high–voltage electrode. When the backward wave of emission almost reaches the high–voltage electrode, the ﬁlament appears. Plasma properties of the observed structure were studied to better understand the nature of a streamer–to–ﬁlament transition. Theoretical analysis suggests that the instability of a ﬂat front of ionization wave (Laplacian instability) triggers the streamer–to–ﬁlament transition, and that a surface stem (a tiny region with enhanced electron density) should be in the origin of the bi-directional ionization wave.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Fine structure of streamer-to-filament transition in high-pressure nanosecond surface dielectric barrier discharge

Ding¹,

Jean²,

Попов³

et al. 2022

Plasma Sources Sci. Technol.

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“…A different experimental approach for determining the reduced electric field from the intensity ratio method is by using photo multipliers instead of an ICCD. Time correlated single photon counting [10,42,43] has the advantage of a much improved temporal resolution, going down to tens of picoseconds, compared to the hundredths of picoseconds generally attained by an ICCD, this matters especially for the time derivatives in the ratio calculation. However, interpretation-wise, the ICCD provides directly correlated spatial and spectral dimensions to the measurement, allowing the spectral fitting of the captured data and spatial verification of the 2D single-shot imaging.…”

Section: Figurementioning

confidence: 99%

High-resolution electric field and temperature distributions in positive streamers

et al. 2023

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In this work, we aim to take a detailed experimental picture of the positive streamer. We apply optical emission spectroscopy to the first negative system (FNS, B2Σu+→X2Σg+) of N2+ and the second positive system (SPS, C3Πu → B3Πg) of N2. Large, centimeter wide, and highly reproducible streamers are created in pure nitrogen and synthetic air, at pressures ranging from 33 to 266 mbar. Direct time resolved spectral imaging of the space charge layer resulted in spatiotemporal maps of the calculated reduced electric field strength (E/N) and rovibrational temperature in sub-nanosecond and sub-millimetre resolution. The E/N peaks at approximately 540 and 480 Td, directly in front of the space charge layer, for synthetic air and pure nitrogen respectively, as determined by using the intensity ratio method of FNS and SPS. A global model for pure nitrogen in PLASIMO uses the experimentally determined E/N distribution to draw a picture of the gas kinetics around the space charge layer passage. In addition, the results of the global model serve as a reference to interpret the rotational and vibrational temperatures obtained from experimental FNS and SPS emissions.

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Electric field development in positive and negative streamers on dielectric surface

Jánský

Bessières

Brandenburg

et al. 2021

Plasma Sources Sci. Technol.

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Multiplication of primary electrons at a dielectrics/gas interface exposed to an external electric field leads to the formation of ultra-fast contracted ionisation waves called surface streamers with high local electric field in their microscopic heads. We study this phenomenon in coplanar barrier discharge in atmospheric pressure air where streamers of both polarities are generated simultaneously. The electric field strength development in the discharge is determined experimentally using time-correlated single photon counting enhanced optical emission spectroscopy with high spatiotemporal resolution. We show that very high values of the electric field of even above 1200 Td (approx. 300 kV cm −1 ) can be a physical reality for positive streamer directly at the dielectric surface. The peak value for negative streamer lies under 200 kV cm −1 . In parallel, a two-dimensional fluid model describes the rapidly changing electric field and the spatiotemporal discharge dynamics in good agreement with the experimental results. We also present the theoretical results of spatiotemporal development of electron density and of charge transfer to the dielectric surface via a collapsing sheath as the discharge structure decays within a very few nanoseconds.

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Remote streamer initiation on dielectric surface

Cited by 5 publications

References 86 publications

Fine structure of streamer-to-filament transition in high-pressure nanosecond surface dielectric barrier discharge

Fine structure of streamer-to-filament transition in high-pressure nanosecond surface dielectric barrier discharge

High-resolution electric field and temperature distributions in positive streamers

Electric field development in positive and negative streamers on dielectric surface

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