Universal nature and specific features of streamers in various dielectric media

Babaeva, Natalia Yu; Naidis, G. V.

doi:10.1088/1361-6463/abe9e0

Cited by 39 publications

(33 citation statements)

References 136 publications

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“…Recently, several experimental and numerical studies in point-to-plane geometry in air gaps of about 1 cm at atmospheric pressure have reported images of axisymmetric diffuse discharges with maximum radius of several centimeters as reviewed in Naidis et al (2018) and shown since then in Brisset et al (2019); Chng et al (2019); Tarasenko et al (2020); Tarasenko (2020); Chen et al (2020); Bourdon et al (2020); Babaeva and Naidis (2021); Zhu et al (2021). These discharges are obtained using high voltage pulses (with maximum voltages being five or ten times higher than classical steady-state breakdown levels) applied with sub-nanosecond and nanosecond rise times.…”

Section: Introductionmentioning

confidence: 99%

“…So far, the number of experimental and numerical studies on positive diffuse discharges in atmospheric pressure air remains limited (Naidis et al, 2018;Tardiveau et al, 2009;Pechereau et al, 2014;Babaeva and Naidis, 2016b;Babaeva and Naidis, 2016a;Marode et al, 2016;Tardiveau et al, 2016;Tarasenko et al, 2020;Chen et al, 2020;Bourdon et al, 2020;Babaeva and Naidis, 2021;Zhu et al, 2021). Rather good agreement between experiments and simulations has been obtained on discharge characteristics such as the maximum discharge radius and ionization front velocity as reviewed in Naidis et al (2018); Babaeva and Naidis (2021) and on the time evolutions of the electric field on the symmetry axis as shown at very early times of discharge propagation in Brisset et al (2019) and during the whole discharge propagation in the gap in Bourdon et al (2020); Zhu et al (2021). As demonstrated for plasma jets in Xiong et al (2012); Lietz and Kushner (2018), the geometry of electrodes and the location of grounded surfaces around the studied set-up has a major influence on discharges at atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

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Morphology of positive ionization waves in atmospheric pressure air: influence of electrode set-up geometry

Bourdon

Péchereau

Tholin

et al. 2021

Plasma Sources Sci. Technol.

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A numerical parametric study on positive diffuse discharges in point-to-plane geometry in air at atmospheric pressure is presented. Different discharge characteristics are studied: ignition time, connection time to the grounded cathode plane, shape of the discharge and its maximum radius at the connection time, evolution of the maximum electric field in the discharge front and velocity of the ionization front during its propagation. First, a case at a DC voltage of 50 kV applied on a rod anode ended by a semi-sphere with a radius of 100 μm set at 1.6 cm from a grounded cathode plane is considered. The influence of the rod radius, the position of a disc holder, the shape of the anode electrode and the radial extension of the computational domain are studied. The radius of curvature of the anode tip (varied between 100 and 1000 μm) and the shape of the anode electrode (rod or hyperbola) are shown to have a negligible influence on discharge characteristics. Conversely, the presence of a disc holder or a small radial computational domain lead to a decrease of the maximum discharge radius at the connection time and a change in the discharge shape from a conical to an ellipsoidal shape. These changes on the discharge morphology have only a limited impact on the propagation velocity of the discharge front and maximum electric field on the discharge axis. Then, a point-to-plane geometry with a rod electrode of 50 μm radius, in a 1.6 cm gap, with a 100 kV voltage applied with a rise time of 1 ns is studied. The influence of a disc holder on the discharge characteristics is the same as for lower DC voltages. Finally, the time evolution of the absolute value of the electric field at different test points on the discharge axis is studied. Close to the anode tip, rapidly after the peak of electric field due to the passage of the ionization front, the electric field in the discharge channel is shown to increase to values higher than the breakdown field.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology of positive ionization waves in atmospheric pressure air: influence of electrode set-up geometry

Bourdon

Péchereau

Tholin

et al. 2021

Plasma Sources Sci. Technol.

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“…It should be noted that this resolution can be easily tuned by imaging optics and pixel binning. The proposed system can be helpful to characterize plasmas which have small plasma size of a few mm or steep gradients [4,8,[30][31][32][33][34][35]. Note that the capability to extend 1D measurement is also highly useful to diagnose larger scale test articles as well.…”

Section: Discussionmentioning

confidence: 99%

High resolution spatially extended 1D laser scattering diagnostics using volume Bragg grating notch filters

Bak¹,

Betancourt²,

Rekhy³

et al. 2022

Preprint

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Laser light scattering systems with volume Bragg grating (VBG) filters, which act as a spectral/angular filter, have often been used as a point measurement technique with spatial resolution as low as a few hundred µm defined by the beam waist. In this work, we demonstrate how VBG filters can be leveraged for spatially resolved measurements with several µm resolution perpendicular to the laser propagation axis over a few mm along the beam propagation axis. The rejection ring, as determined by the angular acceptance criteria of the filter, is derived analytically, and the use of the ring for 1D laser line rejection is explained. For the example cases presented, having a focused probe beam waist with a diameter of ∼ 150 µm, the rejection ring can provide up to several mm length along the beam propagation axis for a 1D measurement, which is also tunable. Additionally, methods to further extend the measurable region are proposed and demonstrated; using a collimation lens with a different focal length or using multiple VBG filters. The latter case can minimize the scattering signal loss, without the trade-off of the solid angle. Such use of multiple VBGs is to extend the measurable region along the beam axis, which differs from the commonly known application of multiple filters to improve the suppression of elastic interferences. 1D rotational Raman and Thomson scattering measurements are carried out on pulsed and DC discharges to verify this method. The system features compactness, simple implementation, high throughput, and flexibility to accommodate various experimental conditions.

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“…The added advantage of experimenting at reduced pressure is that the observer is essentially zooming in, both spatially and temporally, to the streamer discharge, following the scaling laws described by Ebert et al [15]. Our reduced electric field profiles determined for synthetic air are compared with numerical results obtained by Babaeva and Naidis [16] and Li et al [17]. Moreover, we apply a spectral fitting procedure to obtain the distributions of rotational and vibrational temperatures in the streamer head and tail with similar resolution, which is directly compared to the numerical simulation presented in this work.…”

Section: Introductionmentioning

confidence: 88%

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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Universal nature and specific features of streamers in various dielectric media

Cited by 39 publications

References 136 publications

Morphology of positive ionization waves in atmospheric pressure air: influence of electrode set-up geometry

Morphology of positive ionization waves in atmospheric pressure air: influence of electrode set-up geometry

High resolution spatially extended 1D laser scattering diagnostics using volume Bragg grating notch filters

High-resolution electric field and temperature distributions in positive streamers

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