Observation of dust acoustic multi-solitons in a strongly coupled dusty plasma

Boruah, A.; Sharma, S. K.; Nakamura, Yoshiharu; Bailung, Heremba

doi:10.1063/1.4962566

Cited by 19 publications

(16 citation statements)

References 40 publications

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“…These multiple solitons are termed as multi-solitons. In one of the recent experiments done by Boruah et al 31 of dusty plasmas the multi-soliton formation has been clearly demonstrated by increasing the electric field impulse. The MD simulations with Yukawa interaction thus seems to be a good depiction of the properties of the dusty plasma medium.…”

Section: Excitation Of Multi-solitons and Effect Of The Coupling Pmentioning

confidence: 95%

Observation of the Korteweg-de Vries soliton in molecular dynamics simulations of a dusty plasma medium

2017

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Excitation and the evolution of Korteweg-de Vries (KdV) solitons in a dusty plasma medium is studied using Molecular Dynamics (MD) simulation. The dusty plasma medium is modelled as a collection of dust particles interacting through Yukawa potential which takes account of dust charge screening due to the lighter electron and ion species. The collective response of such screened dust particles to an applied electric field impulse is studied here. An excitation of a perturbed positive density pulse propagating in one direction along with a train of negative perturbed rarefactive density oscillations in the opposite direction is observed. These observations are in accordance with evolution governed by the KdV equation. Detailed studies of (a) amplitude vs. width variation of the observed pulse, (b) the emergence of intact separate pulses with an associated phase shift after collisional interaction amidst them etc., conclusively qualify the positive pulses observed in the simulations as KdV solitons. It is also observed that by increasing the strength of the electric field impulse, multiple solitonic structures get excited. The excitations of the multiple solitons are similar to the experimental observations reported recently by Boruah et al. [Phys. of Plasmas 23, 093704 (2016)] for dusty plasmas. The role of coupling parameter has also been investigated here which shows that with increasing coupling parameter, the amplitude of the solitonic pulse increases whereas its width decreases.

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Section: Excitation Of Multi-solitons and Effect Of The Coupling Pmentioning

confidence: 95%

Observation of the Korteweg-de Vries soliton in molecular dynamics simulations of a dusty plasma medium

2017

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“…[20] In low-temperature discharges (DC or RF), the DAWs are excited in the dust grain medium which is confined in a strong electric field (E) of the cathode sheath [5,13] or anodic plasma [3] or rf sheath [21][22][23] or diffused plasma. [29,30] However, the ion-streaming instability which arises due to the streaming of ions relative to the stationary dust particles is considered as a main free energy source to excite DAWs in DC or RF discharge. [29,30] However, the ion-streaming instability which arises due to the streaming of ions relative to the stationary dust particles is considered as a main free energy source to excite DAWs in DC or RF discharge.…”

Section: Introductionmentioning

confidence: 99%

“…[17,19,24] Such low frequency dust acoustic modes are either excited by inherent instabilities such as ion-streaming instability and dust-dust instability [25][26][27][28] or externally forced triggered instabilities. [29,30] However, the ion-streaming instability which arises due to the streaming of ions relative to the stationary dust particles is considered as a main free energy source to excite DAWs in DC or RF discharge. The amount of free energy depends on the velocity of the streaming ions (v i = i E) through the dust grain medium, where i is the mobility of ion.…”

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confidence: 99%

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Choudhary

Bergert²,

Mitic³

et al. 2019

Contributions to Plasma Physics

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This paper reports experiments on self-excited dust acoustic waves (DAWs) andits propagation characteristics in a magnetized rf discharge plasma. The DAWs are spontaneously excited in dusty plasma after adding more particles in the confining potential well and found to propagate in the direction of streaming ions. The spontaneous excitation of such low-frequency modes is possible due to the instabilities associated with streaming ions through the dust grain medium. The background E-field and neutral pressure determine the stability of excited DAWs. The characteristics of DAWs strongly depend on the strength of external magnetic field. The magnetic field of strength B < 0.05 T only modifies the characteristics of propagating waves in dusty plasma at moderate power and pressure, P = 3.5 W and p = 27 Pa, respectively. It is found that DAWs start to be damped with increasing the magnetic field beyond B > 0.05 T and get completely damped at higher magnetic field B ∼ 0.13 T. After lowering the power and pressure to 3 W and 23 Pa respectively, the excited DAWs in the absence of B are slightly unstable. In this case, the magnetic field only stabilizes and modifies the propagation characteristics of DAWs while the strength of B is increased up to 0.1 T or even higher. The modification of the sheath electric field where particles are confined in the presence of the external magnetic field is the main cause of the modification and damping of the DAWs in a magnetized rf discharge plasma. K E Y W O R D Sdust acoustic wave, magnetized dusty plasma, magnetized plasma, RF discharge, superconducting magnet 1The presence of submicron to micrometre-sized particles in a plasma makes it more complex because these particles alter the dynamics of the plasma species (electrons and ions) as well as they exhibit their own dynamics. Such medium, which consists of three charged species namely electrons, ions, and charged solid particles, is termed as a dusty plasma or complex plasma. In the background of a low-temperature plasma, energetic electrons impinge on the surface of the solid particle and charge their surface negatively up to 10 3 -10 5 times of an electron charge [1] to balance the fluxes of electrons and ions. After the density of negatively charged dust particles crosses a critical value, then long-range coulombic interaction among the dust particles turnsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…For obtaining the multisoliton solution of equation (16) and to study the interaction between them, to do so, we shall employ the Hirota bilinear method [23]. The first step: using the transformation on equation 19:…”

Section: Multisoliton Solutionsmentioning

confidence: 99%

“…They compared their results with previous theoretical studies using the Hirota method and found a significant correlation between the results of the two methods. Boruah et al [16] experimentally investigated the propagation and interaction of dust-acoustic multisolitons which unmagnetized strongly coupled dusty plasma. By comparing their results with previous theoretical studies, they proved that the evolution of these waves depends on the amplitude of the initial perturbation.…”

Section: Introductionmentioning

confidence: 99%

Study of Dust-Acoustic Multisoliton Interactions in Strongly Coupled Dusty Plasmas

Kabalan

Ahmad

Ali

2020

Advances in Mathematical Physics

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The effect of the structure parameter on the compressibility of dust grains and soliton behavior in a dusty plasma system consisting of Maxwellian electrons, ions, and dust grains charged with a negative charge has been studied. In the theoretical study, a reductive perturbation technique was used to derive the Korteweg-de Vries (KdV) equation and employ the Hirota bilinear method to obtain multisoliton solution. It is found that coupling and structure parameters have a clear effect on the compressibility. These changes in the compressibility affected the amplitude and width of interactive solitons, in addition to the phase shifts resulting from the interaction. These results can be used to understand the behavior of solitary waves that occur in various natural and laboratory plasma environments with dust impurity situations.

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Observation of dust acoustic multi-solitons in a strongly coupled dusty plasma

Cited by 19 publications

References 40 publications

Observation of the Korteweg-de Vries soliton in molecular dynamics simulations of a dusty plasma medium

Observation of the Korteweg-de Vries soliton in molecular dynamics simulations of a dusty plasma medium

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Study of Dust-Acoustic Multisoliton Interactions in Strongly Coupled Dusty Plasmas

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