Two-dimensional electron density measurement of pulsed positive primary streamer discharge in atmospheric-pressure air

Inada, Yuki; Aono, K.; Ono, Ryo; Kumada, Akiko; Hidaka, Kunihiko; Maeyama, Mitsuaki

doi:10.1088/1361-6463/aa65ee

Cited by 26 publications

(47 citation statements)

References 27 publications

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“…The n e value was determined when the best fitting was achieved, as shown in Figure 4, for the measured three discharge positions. As can be seen, an obviously higher n e is characterized by the intense discharge region in the anode area near the positive-pin boundary, which is common for typical positive-pin electrode streamer discharge [47] . At 170 ns, the H 2 O density at the solution surface region was estimated to be 1.45 × 10 23 m −3 , which was of the same order of magnitude as a direct current-driven helium glow discharge [17] .…”

Section: Electron Density N Ementioning

confidence: 85%

“…The

{n}_{{\rm{e}}}

value was determined when the best fitting was achieved, as shown in Figure 4, for the measured three discharge positions. As can be seen, an obviously higher

{n}_{{\rm{e}}}

is characterized by the intense discharge region in the anode area near the positive‐pin boundary, which is common for typical positive‐pin electrode streamer discharge [ 47 ] .…”

Section: Experimental Setup and Quantitative Proceduresmentioning

confidence: 99%

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Plasma‐enhanced evaporation and its impact on plasma properties and gaseous chemistry in a pin‐to‐water pulsed discharge

Yang

Qiao

et al. 2023

Plasma Processes & Polymers

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The plasma in contact with liquids has led to various novel applications such as plasma biomedicine, material synthesis, and so on. However, the phenomenon of evaporation under plasma treatment and its impact on plasma–liquid interactions has a limited understanding. In this study, the spatially and temporally resolved behavior of water vapor production and its induced influences on plasma properties and gaseous chemistry were studied in detail in an atmospheric pressure pin‐to‐water pulsed He discharge. Diagnostic methods such as laser‐induced fluorescence (LIF) and high‐resolution optical emission spectroscopy (OES) were applied to determine the water vapor and OH radical densities, as well as key plasma parameters such as the gas temperature and electron density. It shows that the physicochemical properties of plasma vary among different discharge regions due to evaporation behavior stimulated during the pulsed discharge‐on phase. In addition, using simulation based on the experimental data, the mechanisms of how water vapor affects the observed spatiotemporal behaviors of OH radicals in different discharge regions are understood. Compared to the pin‐anode and liquid‐cathode sheath regions, proper electron parameters such as density and temperature, as well as water vapor density in the plasma‐positive column, significantly enhance the production of reactive OH radical through the dominant path of electron‐stimulated H2O dissociation. However, higher levels of electron parameters in the intense discharge region near the positive‐pin boundary enhance OH dissociation and finally result in the hollow distribution of OH density. From the global kinetic plasma simulation, the production of reactive hydroxide species playing key roles in plasma medicine treatments, such as O, H, HO2, H2O2, and hydrated ions including H+(H2O)4 and H+(H2O)5, are promoted noticeably as a result of the enhanced water evaporation process.

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Section: Electron Density N Ementioning

confidence: 85%

“…The

{n}_{{\rm{e}}}

value was determined when the best fitting was achieved, as shown in Figure 4, for the measured three discharge positions. As can be seen, an obviously higher

{n}_{{\rm{e}}}

is characterized by the intense discharge region in the anode area near the positive‐pin boundary, which is common for typical positive‐pin electrode streamer discharge [ 47 ] .…”

Section: Experimental Setup and Quantitative Proceduresmentioning

confidence: 99%

Plasma‐enhanced evaporation and its impact on plasma properties and gaseous chemistry in a pin‐to‐water pulsed discharge

Yang

Qiao

et al. 2023

Plasma Processes & Polymers

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“…Plasma catalysis can be realized by introducing dielectric packing beads (coated with catalyst material) in the discharge gap, forming a packed bed dielectric barrier discharge (PB-DBD) reactor. The DBD generally occurs in a filamentary mode by applying a high driving voltage [10][11][12][13][14], which induces a very fast ionization avalanche, propagating from powered electrode to grounded electrode, i.e., a so-called streamer [12,13,[15][16][17][18][19]. Each streamer starts when the driving voltage passes a certain threshold, and will further polarize the dielectric surface [20].…”

Section: Introductionmentioning

confidence: 99%

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

et al. 2018

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Abstract:We investigated the mode transition from volume to surface discharge in a packed bed dielectric barrier discharge reactor by a two-dimensional particle-in-cell/Monte Carlo collision method. The calculations are performed at atmospheric pressure for various driving voltages and for gas mixtures with different N 2 and O 2 compositions. Our results reveal that both a change of the driving voltage and gas mixture can induce mode transition. Upon increasing voltage, a mode transition from hybrid (volume+surface) discharge to pure surface discharge occurs, because the charged species can escape much more easily to the beads and charge the bead surface due to the strong electric field at high driving voltage. This significant surface charging will further enhance the tangential component of the electric field along the dielectric bead surface, yielding surface ionization waves (SIWs). The SIWs will give rise to a high concentration of reactive species on the surface, and thus possibly enhance the surface activity of the beads, which might be of interest for plasma catalysis. Indeed, electron impact excitation and ionization mainly take place near the bead surface. In addition, the propagation speed of SIWs becomes faster with increasing N 2 content in the gas mixture, and slower with increasing O 2 content, due to the loss of electrons by attachment to O 2 molecules. Indeed, the negative O − 2 ion density produced by electron impact attachment is much higher than the electron and positive O + 2 ion density. The different ionization rates between N 2 and O 2 gases will create different amounts of electrons and ions on the dielectric bead surface, which might also have effects in plasma catalysis.

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“…Electron densities in streamer channels in ambient air are of the order of 10 19 − 4 • 10 21 m −3 , see e.g. [87,88], i.e, there is one free electron per (60 nm) 3 to (500 nm) 3 , while the neutral density in ambient air is 2.5 • 10 25 m −3 , so one per (3.4 nm) 3 .…”

Section: Theorymentioning

confidence: 99%

“…It employs the decrease of the refractive index with electron density. Inada et al [88] have shown that with this method they can acquire a twodimensional image of the electron density with a 2 ns temporal resolution. For this they use two Shack-Hartmann type laser wavefront sensors illuminated by laser light of two distinct wavelengths (blue and red) to distinguish gas density and electron density effects.…”

Section: Other Diagnosticsmentioning

confidence: 99%

The physics of streamer discharge phenomena

Nijdam,

Teunissen,

Ebert

2020

Preprint

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In this review we describe a transient type of gas discharge which is commonly called a streamer discharge, as well as a few related phenomena in pulsed discharges. Streamers are propagating ionization fronts with self-organized field enhancement at their tips that can appear in gases at (or close to) atmospheric pressure. They are the precursors of other discharges like sparks and lightning, but they also occur in for example corona reactors or plasma jets which are used for a variety of plasma chemical purposes. When enough space is available, streamers can also form at much lower pressures, like in the case of sprite discharges high up in the atmosphere.We explain the structure and basic underlying physics of streamer discharges, and how they scale with gas density. We discuss the chemistry and applications of streamers, and describe their two main stages in detail: inception and propagation. We also look at some other topics, like interaction with flow and heat, related pulsed discharges, and electron runaway and high energy radiation. Finally, we discuss streamer simulations and diagnostics in quite some detail.This review is written with two purposes in mind: First, we describe recent results on the physics of streamer discharges, with a focus on the work performed in our groups. We also describe recent developments in diagnostics and simulations of streamers. Second, we provide background information on the above-mentioned aspects of streamers. This review can therefore be used as a tutorial by researchers starting to work in the field of streamer physics.

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Two-dimensional electron density measurement of pulsed positive primary streamer discharge in atmospheric-pressure air

Cited by 26 publications

References 27 publications

Plasma‐enhanced evaporation and its impact on plasma properties and gaseous chemistry in a pin‐to‐water pulsed discharge

Plasma‐enhanced evaporation and its impact on plasma properties and gaseous chemistry in a pin‐to‐water pulsed discharge

Mode Transition of Filaments in Packed-Bed Dielectric Barrier Discharges

The physics of streamer discharge phenomena

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