Rayleigh–Taylor instability driven nonlinear vortices in dusty plasmas

Veeresha, B. M.; Das, Amita; Sen, Abhijit

doi:10.1063/1.1881452

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…In fact, dusty plasmas manifest many interdisciplinary research problems and can be realized in a broad range of parameters (e.g. see [8][9][10][11][12][13]). The extension of dusty plasma parameter range to cryogenic conditions has been performed in [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Ultracold ions wake in dusty plasmas

Sundar

Moldabekov

2020

New J. Phys.

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Motivated by the recent experimental realization of ultracold dusty plasma (2019 Sci. Rep. 9 3261), we present the results of particle-in-cell simulation with Monte-Carlo-collisions for wake behind a dust particle due to focusing of ions at superfluid helium temperature (∼2 K). Dynamical screening (wakefield) defines structural and dynamical properties of charged dust particles in plasmas such as phase transition, crystal formation, vibration modes (waves) etc. Here, we delineate in detail the dependence of wake strength on the streaming velocity of ions and on the ion-neutral charge exchange collision frequency (neutrals density) in the ultracold dusty plasma. Lowering the temperature to ultracold level leads to a wake pattern behind a dust particle that completely differs from the wake at normal conditions. For wide range of parameters, most remarkable features of the wakefield are (i) the formation of wake pattern with two maxima split in transverse to ion flow direction in the downstream area, (ii) pronounced inverse V shape of the wakefield closely resembling the wake in quark-gluon plasma and dense quantum plasma (warm dense matter), and (iii) the inter-dust attraction region in transverse direction. The latter shows that molecule-like interaction between dust particles is realized in ultracold dusty plasmas. These observations show a fundamental difference of ultracold dusty plasma physics from well studied complex plasmas at normal conditions.

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Section: Introductionmentioning

confidence: 99%

Ultracold ions wake in dusty plasmas

Sundar

Moldabekov

2020

New J. Phys.

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“…The horizontal and vertical vortex motion of dust grains in the presence of an auxiliary electrode near the levitated dust cloud in capacitive coupled plasma is also reported by Samarian et al 21 and Law et al 22 . The rotation or vortex motion of the dust particulates in the absence of magnetic field can be induced by asymmetric ions flow or sheared flow along with electric field 11,23,24 , charge gradient of the particles along with the non-electrostatic forces 19,[25][26][27] , RayleighTaylor instability 28 and transient shear instability 29 .…”

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confidence: 99%

Experimental observation of self excited co-rotating multiple vortices in a dusty plasma with inhomogeneous plasma background

2017

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We report an experimental observation of multiple co-rotating vortices in a extended dust column in the background of non-uniform diffused plasma. Inductively coupled RF discharge is initiated in the background of argon gas in the source region which later found to diffuse in the main experimental chamber. A secondary DC glow discharge plasma is produced to introduce the dust particles into the plasma. These micron sized poly-disperse dust particles get charged in the plasma environment and transported by the ambipolar electric field of the diffused plasma and found to confine in the potential well, where the resultant electric field of the diffused plasma (ambipolar E-field) and glass wall charging (sheath E-field) hold the micron sized particles against the gravity. Multiple co-rotating (anti-clockwise) dust vortices are observed in the dust cloud for a particular discharge condition. The transition from multiple to single dust vortex is observed when input RF power is lowered. Occurrence of these vortices are explained on the basis of the charge gradient of dust particles which is orthogonal to the ion drag force. The charge gradient is a consequence of the plasma inhomogeneity along the dust cloud length. The detailed nature and the reason for multiple vortices are still under investigation through further experiments, however, preliminary qualitative understanding is discussed based on characteristic scale length of dust vortex. There is a characteristic size of the vortex in the dusty plasma so that multiple vortices is possible to form in the extended dusty plasma with inhomogeneous plasma background. The experimental results on the vortex motion of particles are compared with a theoretical model and found some agreement.

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“…For the second, a choice of gradually increasing density against the gravity is chosen. The RT instability in the context of dusty plasma medium has been studied theoretically by many authors (d'Angelo 1993;Veeresha, Das & Sen 2005;Avinash & Sen 2015;Garai et al 2015;Garai 2016;Dolai & Prajapati 2018). The numerical work on this was reported by our group ) and the experimental work by Pacha et al (2012) and Pacha & Merlino (2020).…”

Section: Introductionmentioning

confidence: 84%

“…For the second, a choice of gradually increasing density against the gravity is chosen. The RT instability in the context of dusty plasma medium has been studied theoretically by many authors (d'Angelo 1993; Veeresha, Das & Sen 2005; Das & Kaw 2014; Avinash & Sen 2015; Garai et al. 2015; Garai 2016; Dolai & Prajapati 2018).…”

Section: Introductionmentioning

confidence: 99%

A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 1. Rayleigh–Taylor instability and buoyancy-driven instability

Dharodi

Das

2021

J. Plasma Phys.

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Rayleigh–Taylor (RT) and buoyancy-driven (BD) instabilities are driven by gravity in a fluid system with inhomogeneous density. The paper investigates these instabilities for a strongly coupled dusty plasma medium. This medium has been represented here in the framework of the generalized hydrodynamics (GHD) fluid model which treats it as a viscoelastic medium. The incompressible limit of the GHD model is considered here. The RT instability is explored both for gradual and sharp density gradients stratified against gravity. The BD instability is discussed by studying the evolution of a rising bubble (a localized low-density region) and a falling droplet (a localized high-density region) in the presence of gravity. Since both the rising bubble and falling droplet have symmetry in spatial distribution, we observe that a falling droplet process is equivalent to a rising bubble. We also find that both the gravity-driven instabilities get suppressed with increasing coupling strength of the medium. These observations have been illustrated analytically as well as by carrying out two-dimensional nonlinear simulations. Part 2 of this paper is planned to extend the present study of the individual evolution of a bubble and a droplet to their combined evolution in order to understand the interaction between them.

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Rayleigh–Taylor instability driven nonlinear vortices in dusty plasmas

Cited by 15 publications

References 11 publications

Ultracold ions wake in dusty plasmas

Ultracold ions wake in dusty plasmas

Experimental observation of self excited co-rotating multiple vortices in a dusty plasma with inhomogeneous plasma background

A numerical study of gravity-driven instability in strongly coupled dusty plasma. Part 1. Rayleigh–Taylor instability and buoyancy-driven instability

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