The results of the modelling of an atmospheric-pressure dielectric barrier discharge (DBD) in argon obtained using a time-dependent and spatially two-dimensional fluid-Poisson model in axisymmetric geometry are provided in this dataset. The spatiotemporal evolution of the electron number density, electric current, applied, memory and gap voltage, the spatial distribution of the number density of electrons and argon excited atoms, the electric field, electron production and loss rates, and surface charge density distribution are used for the analysis of the surface-streamer interaction and the cathode-layer formation. The analyses showed that the radial deflection of the volume streamer is driven by the free electrons that remained in the volume from the Townsend pre-phase and guided by the radial component of the electric field. The surface discharge, occurring simultaneously with the propagation of the deflected volume streamer, is governed by ion-induced secondary electron emission and the surface charges accumulated on the dielectric.

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Release Date | 2022-01-24 |

Identifier | 0e609bc7-3a55-4b13-95ca-a0f9d5b2813a |

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Plasma Source Properties | The object of interest is streamer-surface interaction and the cathode-layer formation during the first discharge event in the single-filament dielectric barrier discharge (DBD) in argon at atmospheric pressure. The modelling is performed for the DBD in an asymmetric arrangement with a 1.5 mm gap, electrode radius of 2 mm and 0.5 mm thick dielectric (alumina, relative permittivity 9) covering grounded electrode, driven by sinusoidal voltage (voltage amplitude of 3 kV and frequency 60 kHz). |

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Plasma Medium Properties | Pure argon, gas pressure is 760 Torr, constant gas temperature of 300 K |

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Plasma Diagnostics Properties | Model: Fluid-Poisson model in cylindrical geometry; |

Plasma Diagnostics Procedure | An atmospheric-pressure DBD in argon is investigated by means of time-dependent and spatially two-dimensional fluid-Poisson modelling in an axisymmetric geometry. The characteristic structure consisting of the volume streamer propagating just above the dielectric and simultaneous development of an additional surface discharge near the cathode during the initial discharge is observed and explained. The model comprises a set of balance equations for the particle number densities of electrons and the most important argon species (atomic Ar+ and molecular Ar2+ ions, as well as the lumped excited atomic Ar∗ and molecular Ar2∗ states of argon), Poisson’s equation for the electric potential and field, the electron energy balance equation and a balance equation for the surface charge density. The quasi-neutral initial conditions and physically-based boundary conditions, accounting for thermal flux and partial reflection of the particles, are used. The additional term describing the ion-induced emission of secondary electrons is included into the boundary conditions for the balance equations for the particle number density and energy density of electrons. |

Language | English |

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Public Access Level | Public |

Contact Name | Jovanović, Aleksandar |

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#### Data and Resources

- Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 2data
The spatiotemporal evolution of the electron number density during the...

Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 3(a)csv
The temporal variation of the applied voltage (Ua), memory voltage (Um), gap...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 3(b)csv
The temporal variation of the surface charge (Q) accumulated on the...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 3(c)-(f)data
The spatial profiles of the electron and excited argon atom number densities...

Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 4data
The spatial profiles of the magnitude, radial and axial component of the...

Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 5(a)csv
The spatial profiles of the electron source term and the divergence of the...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 5(b)csv
The spatial profiles of the electron source term and the divergence of the...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 6csv
Spatial distribution of the surface charge density on the dielectric surface...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 7(a)csv
Spatial profiles of the electric field and the number densities of electrons...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 7(b)csv
Spatial profiles of the electric field and the number densities of electrons...

Preview Download - Streamer-surface interaction in an atmospheric pressure DBD in Ar - Fig. 8data
Comparison of non-transformed and Abel-transformed profiles of the excited...

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