Diagnostics of a nanosecond atmospheric plasma jet. Electron and ro-vibrational excitation dynamics

Britun, Nikolay; Christy, Dennis; Gamaleev, Vladislav; Hori, Masaru

doi:10.1088/1361-6595/aca0bb

Cited by 3 publications

(3 citation statements)

References 91 publications

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“…Moreover, the shorter rise time also contributes to a faster propagation speed of the ionization wave [92]. Therefore, at relatively low pulse voltages, even if no runaway electrons are generated, a fast ionization wave may still occur, thereby shortening the gas breakdown time [93].…”

Section: Discussionmentioning

confidence: 99%

Breakdown modes in nanosecond pulsed micro-discharges at atmospheric pressure

Chen,

Wu,

Chen

et al. 2023

J. Phys. D: Appl. Phys.

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Nanosecond pulse micro-discharges at atmospheric pressure have garnered attention because of their unique physics and numerous applications. In this study, we employed a one-dimensional particle-in-cell/Monte Carlo collision model coupled with an external circuit, using an unequal weight algorithm to investigate the breakdown processes in micro-discharges driven by pulses with voltage ranging from 1 kV to 50 kV at atmospheric pressure. The results demonstrate that nanosecond pulse-driven microplasma discharges exhibit different breakdown modes under various pulse voltage amplitudes. We present the discharge characteristics of two modes: ‘no-breakdown’ when the breakdown does not occur, and ‘runaway breakdown mode’ and ‘normal breakdown mode’ when the breakdown does happen. In the runaway breakdown mode, the presence of runaway electrons leads to a phenomenon in which the electron density drops close to zero during the pulse application phase. Within this mode, three submodes are observed: local mode, transition mode, and gap mode, which arise from different secondary electron generation scenarios. As the pulse voltage amplitude increases, a normal breakdown mode emerges, characterized by the electron density not dropping close to zero during the pulse application phase. Similarly, three sub-modes akin to those in the runaway breakdown mode exist in this mode, also determined by secondary electrons. In these modes, we find that electron loss during the pulse application phase is dominated by boundary absorption, whereas during the afterglow phase, it is dominated by recombination. Ion losses are primarily governed by recombination. These findings contribute to a better understanding of the discharge mechanisms during the breakdown process.

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Section: Discussionmentioning

confidence: 99%

Breakdown modes in nanosecond pulsed micro-discharges at atmospheric pressure

Chen,

Wu,

Chen

et al. 2023

J. Phys. D: Appl. Phys.

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“…Dubinov [12] developed the non-linear theory of ion-acoustic waves in two-species isotropic collisionless plasma, derived the differential equation describing the profile of the ion concentration, and calculated profiles of the concentration in the periodic ion-acoustic wave and soliton. Britun et al [13] devoted to electrical and optical discharge characterization including voltage-current behavior, emission dynamics, as well as ro-vibrational dynamics of a nanosecond atmospheric plasma. They found that rather small air admixtures facilitate gas breakdown.…”

Section: Introductionmentioning

confidence: 99%

“…Britun et al. [13] devoted to electrical and optical discharge characterization including voltage‐current behavior, emission dynamics, as well as ro‐vibrational dynamics of a nanosecond atmospheric plasma. They found that rather small air admixtures facilitate gas breakdown.…”

Section: Introductionmentioning

confidence: 99%

Orbits and chaos of a two‐fluid magnetized plasma oscillator subjected to parametric excitation with square delayed feedback

Hu,

Zhou

2023

Z Angew Math Mech

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In this manuscript, a two‐fluid magnetized plasma oscillator subjected to parametric excitation with square delayed feedback is studied both analytically and numerically. The Hamilton systems of triple‐well and narrow single‐well are discussed in detail. The scenarios of phase portraits and equilibria are given. Homoclinic and heteroclinic orbits are strictly derived. With the Melnikov method, the critical value of chaos arising from homoclinic or heteroclinic intersections is derived analytically. We have discovered some interesting dynamic phenomena, such as uncontrollable time delays with which chaos always occurs for this system. The influence of time‐delay on the chaotic property is also studied rigorously. On the basis of theoretical analysis, some numerical simulations including time histories, phase portraits, bifurcation diagrams, Poincaré sections, Lyapunov exponential spectrums and attractor basins are given. Numerical simulations are consistent with theoretical results.

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Diagnostics of a nanosecond atmospheric plasma jet. Ionization waves, plasma density and electric field dynamics

Britun

Christy

Gamaleev

et al. 2023

Journal of Applied Physics

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Atmospheric repetitive He discharge with 10 ns current peak width and 3×1011 V/s voltage front rise working in jet geometry is studied. This part deals with the ionization waves, electron density, and electric field dynamics. The electron density (ne) is measured by Stark broadening of the H Balmer β (Hβ) and He emission lines, the electric field is analyzed using Stark polarization spectroscopy, and the ionization waves are studied by fast imaging. We found that the ionization fronts propagate in the quartz tube with a velocity of about 5×105 m/s; this velocity slowly decreases along the tube but may jump in the open air at some conditions. In the space between electrodes, ne increases rapidly at the beginning, reaching about 7×1015 cm−3, which corresponds to electron avalanche defining the discharge current peak. In the tube, the electrons are concentrated in the ionization wavefronts having low density (<1014 cm−3). Before the avalanche, a macroscopic (electrode-induced) electric field dominates between the electrodes peaking at about 8 kV/cm as deduced from Hβ peak splitting, whereas during the avalanche, Hβ reveals a double-Lorentzian polarization-insensitive profile imposed by two electron populations. In the low-density electron group, ne does not exceed 1014 cm−3, whereas the high-density group is responsible for the observed electron density peak formation. After a rapid decay of the electrode-induced field, the microscopic electric field (induced by space-charge) dominates, peaking at about 25 kV/cm after the electron density peak. Certain electric field anisotropy is also detected in the quartz tube, confirming the wavefront propagation.

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Diagnostics of a nanosecond atmospheric plasma jet. Electron and ro-vibrational excitation dynamics

Abstract: Atmospheric repetitive He discharge with 10 ns current peak width and 3 × 10 11 V s−1 voltage front rise working in jet geometry is studied. The first part of the study is devoted to electrical an… Show more

Cited by 3 publications

References 91 publications

Breakdown modes in nanosecond pulsed micro-discharges at atmospheric pressure

Breakdown modes in nanosecond pulsed micro-discharges at atmospheric pressure

Orbits and chaos of a two‐fluid magnetized plasma oscillator subjected to parametric excitation with square delayed feedback

Diagnostics of a nanosecond atmospheric plasma jet. Ionization waves, plasma density and electric field dynamics

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