Ionization waves (striations) in a discharge plasma

Pekárek, L.

doi:10.3367/ufnr.0094.196803d.0463

Cited by 98 publications

(21 citation statements)

References 10 publications

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“…This causes the motion of the waves phase from the anode side to the cathode side of the column. 30 The numerical simulations show that this wave solution is independent of the initial conditions. Whether this wave solution is amplified or damped in the course of time depends on the current I 0 .…”

Section: B Comparison To Known Analytical Resultsmentioning

confidence: 91%

Numerical investigations on strong pattern selecting Eckhaus instabilities in neon glow discharges

et al. 2000

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Starting from the hydrodynamic description of the positive column in a neon glow discharge, a numerical approach is used in order to study the nonlinear properties of ionization waves. Within the instability region of the homogeneous equilibrium state, a secondary instability of the Eckhaus type is found. Compared to the classical results, the plasma system shows some peculiarities, e.g., an asymmetric stability band and strong selection of periodic patterns. The dependency of the shape and the width of this band on the discharge parameters is investigated. The spatiotemporal dynamics connected with the transitions from the stability band to the instability region have been studied showing different behavior on the upper and lower border of the stability region. Normally a subcritical Eckhaus instability has been revealed. Moreover, at selected sets of plasma parameters the phenomenon of spatiotemporal intermittency is found.

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Section: B Comparison To Known Analytical Resultsmentioning

confidence: 91%

Numerical investigations on strong pattern selecting Eckhaus instabilities in neon glow discharges

et al. 2000

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“…Such a solution also exists in the discussed case of interaction of the forward and backward waves at σ 2 = σ. To find such a solution, we can assume that real envelopes have the form 4 where А, B, and μ are the fitting parameters. Substitution of this ansatz into Eqs.…”

Section: Nonlinear and Quantum Opticsmentioning

confidence: 99%

“…In the limiting case, these two vectors can be pointing in opposite directions. The wave in which the phase and the group velocities have opposite directions is referred to as the backward wave [1][2][3][4]. Investigation of this kind of waves has attracted much attention in different fields of physics.…”

Section: Introductionmentioning

confidence: 99%

“…Investigation of this kind of waves has attracted much attention in different fields of physics. They appear, e.g., in low-density plasmas [4,5], transmission lines [6,7], electron beams [8], chemical reactions leading to the creation of dissipative structures [9][10][11], and acoustics [12][13][14]. The results of some of these studies were reviewed in [15].…”

Section: Introductionmentioning

confidence: 99%

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Interaction of forward and backward waves in a Kerr medium

Maĭmistov

Lyashko

2015

Opt. Spectrosc.

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Interaction of forward and backward waves in a nonlinear medium exhibiting a third-order nonlinearity (the Kerr medium) is investigated theoretically. We have analyzed the propagation of two quasi-harmonic waves with different carrier frequencies, such that the phase velocity at one frequency has the same direction as the group velocity, while the phase and the group velocities at the other frequency have opposite directions. Coupling between the waves in a Kerr medium is caused by cross modulation. It is demonstrated that a steady-state biharmonic wave propagating as a single whole can be formed in this situation.

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“…S TANDING ionization waves (i.e., strata) [1], [2] could be seen by the naked eye in the positive column of a stationary glow discharge forming a remarkable spatially periodical pattern. As a rule, they take the shape of luminescent transverse stripes or the shape of zones separated by dark spots [3], [4].…”

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confidence: 99%

Flower-Shaped Strata

Дубинов

Esin

Maksimov

2011

IEEE Trans. Plasma Sci.

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Photograph images of 3-D standing ionization waves (i.e., strata) in the shape of crabs and flowers are obtained in a dc glow discharge in air at moderate pressure (10-30 torr). The main idea of such 3-D strata is based on creating conditions for free propagation of ionization waves in all directions. These conditions may be reached with a glass cylinder of large diameter (155 mm) and electrodes of small diameters (25 mm).Index Terms-Glow discharges, light sources, plasma waves, plasmas. S TANDING ionization waves (i.e., strata) [1], [2] could be seen by the naked eye in the positive column of a stationary glow discharge forming a remarkable spatially periodical pattern. As a rule, they take the shape of luminescent transverse stripes or the shape of zones separated by dark spots [3], [4]. Along with them, 3-D strata could exist in the form of concentric spheres of various diameters [5], [6].It turns out that such plane periodic sequences of bright stripes or concentric spheres do not exhaust all possible stratum configurations. Using a gas-discharge chamber in the form of a cylinder of large diameter (comparable to its height), one can obtain strata of fanciful shapes, for example, flowerlooking strata. The main idea of such 3-D strata is based on creating conditions for free propagation of ionization waves in all directions.The experiments are performed in the glass cylinder of 155-mm diameter and 230-mm height (a 3-L-volume jar). Steel electrodes of 25-mm diameter are located inside the cylinder. The distance between the electrodes is 230 mm. First, we make sure that the air pressure in the cylinder is 10-30 torr, and then, we ignite a dc stationary glow discharge. The supply power is close to 50 W.

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Ionization waves (striations) in a discharge plasma

Cited by 98 publications

References 10 publications

Numerical investigations on strong pattern selecting Eckhaus instabilities in neon glow discharges

Numerical investigations on strong pattern selecting Eckhaus instabilities in neon glow discharges

Interaction of forward and backward waves in a Kerr medium

Flower-Shaped Strata

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