Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

Höft, Hans; Becker, Markus M.; Kolb, Juergen F.; Huiskamp, T.

doi:10.1088/1361-6595/aba112

Cited by 16 publications

(20 citation statements)

References 37 publications

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“…These values of discharge front velocities and maximum absolute value of the electric field in the discharge front are in good agreement with experimental and numerical results obtained for discharges in atmospheric pressure air in point-to-plane geometries with gaps of about 1 cm generated by high voltages applied with sub-nanosecond and nanosecond rise times, as reviewed in Naidis et al (2018); Bourdon et al (2020); Babaeva and Naidis (2021). Similar values of discharge front velocities have been also observed in sub-nanosecond pulsed discharges generated in a 1.2 mm pin-to-pin gap in air at atmospheric pressure (Höft et al, 2020). It is interesting to point out that the evolution of the front propagation velocity during its propagation shown in Figure 5 A c c e p t e d M a n u s c r i p t pressure air.…”

Section: Resultssupporting

confidence: 86%

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: Resultssupporting

confidence: 86%

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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“…We can further improve the accuracy of these models by comparing them to experimental results [2]. Simply said: when numerical models can faithfully reproduce experimental results with the strangest high-voltage waveforms we can produce, we can be more and more sure of the accuracy of these models (and improve them further) [42].…”

Section: Introductionmentioning

confidence: 99%

Effective streamer discharge control by tailored nanosecond-pulsed high-voltage waveforms

Huiskamp

Ton

Azizi

et al. 2021

J. Phys. D: Appl. Phys.

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In this paper we present our solid-state nanosecond pulse source (the solid-state impedance-matched Marx generator) which can generate arbitrary waveforms and which can be used for pulsed discharge generation. The purpose of the development of such a generator is twofold: by being able to change the waveform at will, we aim to control the discharge generated by such pulses very precisely which can be very useful for plasma applications, but also for more fundamental studies. In the presented study, we applied the arbitrary-waveform pulse source for streamer discharge generation in a cylinder-wire-like arrangement and used the arbitrary-waveform capability to change the rise time (in our experiments we used 6.8-26.2 ns) of unipolar positive pulses with 6-10 kV amplitude and 80 ns duration. Additionally, we introduced variations of a step in the rising edge of the waveform. We performed measurements both in air and nitrogen to electrically characterize the discharge while analyzing the streamer propagation in the plasma reactor with intensified charge-coupled device imaging and measured ozone generation (in air). The results show that we can indeed control the propagation of the streamer discharge with the stepped waveform, but that the rise-time variation has little effect on the streamer propagation in our system. However, the streamer velocity and structure differs significantly comparing discharges in nitrogen and air for the same applied voltage waveform. Additionally, for some of the stepped waveforms we found a slight increase of the ozone yield for air at low overall energy densities.

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“…The main advantage of the proposed simulation scheme is its flexibility and potential ability to simulate plasma discharges in complex geometries. For example, after further development, the method can be applied to complement current experimental studies on nanosecond pulsed streamer discharges [37,38,39] or reveal discharge properties for novel plasma jet devices [40]. The flexibility of the HPS scheme can be utilized to develop a decomposition technique for resolving boundary layers on the electrode surfaces with high accuracy.…”

Section: Discussionmentioning

confidence: 99%

“…4 . After that, using relations (38), it is straightforward to construct the matrices T α . This step finalizes the construction of the DtN operator for the parent node Ω c .…”

Section: The Hierarchical Poincaré -Steklov Schemementioning

confidence: 99%

A spectral element method for modelling streamer discharges in low-temperature atmospheric-pressure plasmas

Semenov,

Weltmann

2021

Preprint

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Streamers are ionization fronts that occur in gases at atmospheric and sub-atmospheric pressures. Numerical studies of streamers are important for practical applications but are challenging due to the multiscale nature of this discharge type. This paper introduces a spectral element method for modelling streamer discharges. The method is developed for Cartesian grids but can be extended to be used on unstructured meshes. The streamer model is based on the Poisson equation for the electric potential and the electron continuity equation. The Poisson equation is discretized via a spectral method based on the integral representation of the solution. The hierarchical Poincaré -Steklov (HPS) scheme is used to solve the resulting set of equations. The electron continuity equation is solved by means of the discontinuous Galerkin spectral element method (DGSEM). The DGSEM is extended by an alternative definition of the diffusion flux. A subcell finite volume method is used to stabilize the DGSEM scheme, if required. The entire simulation scheme is validated by solving a number of test problems and reproducing the results of previous studies. Adaptive mesh refinement is used to reduce the number of unknowns. The proposed method is found to be sufficiently fast for being used in practical applications. The flexibility of the method provides an interesting opportunity to broaden the range of problems that can be addressed in numerical studies of low-temperature plasma discharges.

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Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

Cited by 16 publications

References 37 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

Effective streamer discharge control by tailored nanosecond-pulsed high-voltage waveforms

A spectral element method for modelling streamer discharges in low-temperature atmospheric-pressure plasmas

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