About the Development of a Nonlinear Equivalent Circuit for a Neon Gas Discharge in the Oscillating Regime

Weltmann, K.‐D.; Unger, Horst; Deutsch, Hans‐Peter; Wesch, J.; Wilke, Charles R.

doi:10.1002/ctpp.2150330403

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…In spite of many efforts to clarify the relation between ionization waves and electrical oscillations in the discharge circuit, the problem still remains unsolved [24]. Attempts have been made to explain the dc discharge nonlinear behaviour, including chaotic behaviour, on the basis of a nonlinear equivalent circuit modelling the fundamental processes in the PC [25]. Recently, V d fluctuations have been interpreted, in view of the nonlocal kinetic theory, as a result of the superposition of the voltage fluctuations due to the presence of ionization waves in the finite PC and the externally imposed voltage oscillations in a dc discharge in neon [26].…”

Section: Introductionmentioning

confidence: 99%

Interactions between ionization waves and potential structure formed at a constriction of the dc He positive column

Sirghi

Ohe

Popa

1997

J. Phys. D: Appl. Phys.

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The potential structure formed at a sharp change in diameter of a diffusion-controlled positive column of a low-pressure and low-current dc He glow discharge has been experimentally investigated in relation to either externally or self-excited ionization waves. A strong electric field evolved on a typical distance of 1 cm in front of the constriction to provide the continuity of discharge current through it, when the constricted part of the plasma column is on the anode side. The electron energy distribution function is not in equilibrium with the field, showing the formation of a fast electron group that is quickly dumped out towards the anode because of the inelastic processes and the radial loss. Either an externally or a self-excited ionization wave disturbs the potential structure, by periodically weakening and strengthening it. As a result, large fluctuations of the local axial electric field in the structure occur and, related to them, fluctuations of the discharge voltage and current are yielded, which make the external discharge circuit a positive feedback loop for the ionization waves.

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Section: Introductionmentioning

confidence: 99%

Interactions between ionization waves and potential structure formed at a constriction of the dc He positive column

Sirghi

Ohe

Popa

1997

J. Phys. D: Appl. Phys.

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The Influence of the Gas‐Temperature on the Behaviour of the Positive Column of a Neon Glow Discharge and its Description by a Nonlinear Equivalent Circuit

Weltmann

Unger

Deutsch

et al. 1995

Contrib. Plasma Phys.

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The concentration of metastable atoms can significantly be influenced by changing the gas temperature [I]. Starting from a set of balance equations, consisting of the balance equation for the electrons, the balance equation for excited atoms and the current balance equation the impedance behaviour is calculated in dependence on the gas temperature. Based on a theoretical description of the discharge plasma a nonlinear equivalent circuit representing the behaviour of the positive column at higher gas-temperatures (250 K-500 K) is developed. The circuit posseses only positive parameters for the reactances which can be calculated by means of the elementary processes occuring in the discharge plasma. Experimental investigations of the static current/voltage characteristic and the impedance behaviour support the proposed circuit model. Symbols... A,, coefficients of the set of nonlinear differential equations containing the plasma parameters collision rates direct ionization stepwise ionization of excited atoms by collision with electrons stepwise ionization by collision of exited atoms production of metastable atoms change of s,-atoms in s,-atoms by collision change of s,-atoms in s,-atoms by collision loss of metastable atoms by collision with electrons total excitation. concentration of electrons concentration of metastable atoms concentration of atoms Concentration of resonance atoms current axial electric field strength elementary charge radius of the tube mobility of electrons production rate of particles i life time of the species i natural life time of the s,-level of the neon atom resonance wavelength of the s,-level of the neon atom

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A resonator-based dual-frequency driven atmospheric pressure plasma jet

Bansemer

Weltmann

2022

Plasma Res. Express

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An atmospheric-pressure argon plasma jet featuring a novel integrated resonator-based multi-frequency impedance matching is presented and briefly characterized. Two narrow RF frequency bands can be chosen for operation or used simultaneously. This includes a mode with the higher frequency value being exactly five times the low-er one. Phase-resolved optical emission spectroscopy measurements show a distinct influence of the input frequency combination on the discharge dynamics. Measure-ments of the dissipated electrical power and the emission spectrum for each operating mode complete the basic characterization of the device. Although it is constructively much simpler and more compact than dual-frequency discharges using a conventional impedance matching system, the presented device shows an excellent performance in dual-frequency operation.

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About the Development of a Nonlinear Equivalent Circuit for a Neon Gas Discharge in the Oscillating Regime

Cited by 3 publications

References 7 publications

Interactions between ionization waves and potential structure formed at a constriction of the dc He positive column

Interactions between ionization waves and potential structure formed at a constriction of the dc He positive column

The Influence of the Gas‐Temperature on the Behaviour of the Positive Column of a Neon Glow Discharge and its Description by a Nonlinear Equivalent Circuit

A resonator-based dual-frequency driven atmospheric pressure plasma jet

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