Spatial and spatiotemporal patterns formed after self-organization in plasma

Lozneanu, E.; Popescu, Veronica; Popescu, Ştefan; Sanduloviciu, M.

doi:10.1109/tps.2002.1003908

Cited by 9 publications

(8 citation statements)

References 3 publications

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“…The experiments proved that at the origin of current filaments is the formation of a quasi-bidimensional anode spot. Its emergence follows the same physical scenario as in the three-dimensional case, where it is also known as "plasma ball of fire" [13].…”

Section: Introductionmentioning

confidence: 93%

Turing structures in dc gas discharges

Popescu

2006

Europhys. Lett.

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Self-organized spatial plasma structures exhibit many similarities with Turing structures obtained in biology and chemistry. Using an analytical mesoscopic approach it is shown that plasma balls of fire belong to the same class of Turing structures like the Brusselator. It is also mathematically proved that the existence of these self-organized plasma structures is related with a negative differential resistance. There are also established the mathematical conditions which the negative differential resistance must satisfy for obtaining a stationary ball of fire at the anode of a plasma diode.

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Section: Introductionmentioning

confidence: 93%

Turing structures in dc gas discharges

Popescu

2006

Europhys. Lett.

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“…In plasma physics, spatiotemporal pattern formation has been observed in gas discharges, such as those used for lighting sources or gas lasers [17,18], and in dielectric barrier discharges [19]. D'Angelo predicted spatiotemporal structure formation in dusty plasmas when ionization and ion-drag effects on dust acoustic waves were taken into account [20].…”

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confidence: 99%

Observations of a structure-forming instability in a dc-glow-discharge dusty plasma

2011

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By adjusting the anode current and axial magnetic strength of a dc-glow-discharge dusty plasma, we have found plasma and dust conditions conducive to dusty plasma structurization, similar to the one discussed theoretically by Morfill and Tsytovich [Plasma Phys. Rep. 26, 682 (2000)]. The structurization instability leads to the formation of a pattern where the dust suspension transforms into alternating stationary regions of high and low dust densities. We have measured the dependence of the wavelength of the nonpropagating dust density structures on neutral pressure and plasma density and discussed the results in terms of the dispersion relation obtained by D'Angelo [Phys. Plasmas 5, 3155 (1998)] for an ionization and ion-drag instability. The observations are also considered in light of a recent theoretical prediction by Khrapak et al. [Phys. Rev. Lett. 102, 245004 (2009)] that under certain conditions the effects of the polarization force on dust particles can cause dust acoustic waves to stop propagating, resulting in the formation of aperiodic, stationary dust density structures.

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“…Growth rates obtained from the kinetic theory were in better agreement with the measured growth rates as compared to those obtained from the fluid theory. In plasma physics, spatiotemporal pattern formations have been observed in ordinary gas discharges, such as those used for lighting sources or gas lasers [74,75], and in dielectric barrier discharges [76][77][78][79]. Dusty plasmas exhibit similar complex behaviors, such as the formation of voids [80][81][82].…”

Section: Discussionmentioning

confidence: 99%

Structure formation and wave phenomena in moderately coupled dusty plasmas

Heinrich¹

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Dusty plasmas, defined as plasmas of ions, electrons, neutrals, and charged micron to sub-micron dust particles, support a rich diversity of physical states. These states (ranging from solids to liquids to gas) are determined by the ratio of the Coulomb potential energy between dust particles to the particles kinetic energy and allow for a broad range of phenomena, from crystallization to dust acoustic waves. Due to various dusty plasma interactions, dust acoustic waves can be nonlinear and exhibit various wave phenomena, from topological wave defects to shock waves to structure formations. In this thesis, I investigate a spectrum of plasma and wave interactions in liquid-like dusty plasmas and focus on a range of dust acoustic wave phenomena observed experimentally in a dc discharge dusty plasma. By developing various experimental techniques, dust acoustic wave di↵raction and topological wave defects, dust acoustic shock waves, temporal dust acoustic wave growth, and structure forming dust acoustic waves were observed. I begin in Chapter 2 with the di↵raction of dust acoustic waves, which I investigated by introducing a glass rod into the dusty plasma. The resulting di↵raction pattern was compared to acoustic wave di↵raction in a neutral gas. In addition to the di↵raction pattern, topological wave defects were observed to form. I continue Chapter 2 with a preliminary investigation into topological wave defects in dust acoustic waves. Chapter 3 follows with three nonlinear dust acoustic wave experiments. I created a shock tube like profile for dust acoustic waves using a single slit. The shock-tube like potential resulted in two sets of nonlinear dust acoustic waves, coalescing high and low amplitude waves and dust acoustic waves that developed into dust acoustic shock waves. The self-excited dust acoustic shock waves were compared to theoretical models. The third nonlinear dust acoustic wave phenomenon that I investigated was a reverse drift mode that appears in high amplitude dust acoustic waves. I propose a LIST OF TABLES .

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Spatial and spatiotemporal patterns formed after self-organization in plasma

Cited by 9 publications

References 3 publications

Turing structures in dc gas discharges

Turing structures in dc gas discharges

Observations of a structure-forming instability in a dc-glow-discharge dusty plasma

Structure formation and wave phenomena in moderately coupled dusty plasmas

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