Dust charging in dynamic ion wakes

Matthews, L. S.; Sanford, Dustin; Kostadinova, Eva; Ashrafi, K. S.; Guay, Evelyn; Hyde, Truell

doi:10.1063/1.5124246

Cited by 30 publications

(25 citation statements)

References 53 publications

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“…The increased flow velocity also causes the spatial extent of the ion wake to be narrower in the radial (cross-stream) direction and extended in the direction of ion flow (Matthews et al. 2019). The interparticle interaction energy, as given by (1.1), also depends on the ion flow velocity, predicting that anisotropy in the particle distribution begins to develop when (Ivlev et al.…”

Section: Methodsmentioning

confidence: 99%

“…The plasma conditions shown in figures 2 and 3 are used to model the dynamics and charging of the dust in a flowing plasma using the molecular dynamics code DRIAD (Dynamic Response of Ions and Dust) (Matthews et al. 2019), which solves the equations of motion of the ions and dust on their individual time scales. Here we compare the dust dynamics given the time-averaged plasma conditions (Case 1) with three cases where the electron and ion temperatures are set by the temperatures between the ionization waves (denoted by the red shaded regions in figure 3), but the electric field is increased to yield different values of the ion drift speed, .…”

Section: Methodsmentioning

confidence: 99%

“…The forces between the dust particles are Coulomb interactions, as the ions in the simulation provide the shielding, while the forces between the dust and ions are taken to be Yukawa interactions (Matthews et al. 2019; Ashrafi et al. 2020).…”

Section: Dynamics Of Ions and Dustmentioning

confidence: 99%

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Effect of ionization waves on dust chain formation in a DC discharge

et al. 2021

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An interesting aspect of complex plasma is its ability to self-organize into a variety of structural configurations and undergo transitions between these states. A striking phenomenon is the isotropic-to-string transition observed in electrorheological complex plasma under the influence of a symmetric ion wake field. Such transitions have been investigated using the Plasma Kristall-4 (PK-4) microgravity laboratory on the International Space Station. Recent experiments and numerical simulations have shown that, under PK-4-relevant discharge conditions, the seemingly homogeneous direct current discharge column is highly inhomogeneous, with large axial electric field oscillations associated with ionization waves occurring on microsecond time scales. A multi-scale numerical model of the dust–plasma interactions is employed to investigate the role of the electric field in the charge of individual dust grains, the ion wake field and the order of string-like structures. Results are compared with those for dust strings formed in similar conditions in the PK-4 experiment.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of ionization waves on dust chain formation in a DC discharge

et al. 2021

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“…where m i and m e are the ion and electron masses, T e and T i are the ion and electron temperatures and V fl is the floating potential at the surface of the dust. Recent works by Matthews et al (2020), Khrapak et al (2005) and Land et al (2010) have shown the importance of ion-neutral collisions for the charging of dust in plasma. In order to take into account the collision of ions with the neutral particles, a modified formula for ion current is used to replace (3.2) and is given by Land et al (2010) based on the previous study by Khrapak et al (2005):…”

Section: Charging Of the Dust Particlementioning

confidence: 99%

Effect of driving frequency on dust particle dynamics in radiofrequency capacitive argon discharge

2021

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This paper investigates the influence of the driving frequency on the dynamics of a single dust particle in argon radiofrequency discharge. A one-dimensional fluid model is presented and solved in the entire inter-electrode domain using the finite difference method. In order to solve the particle equation of motion, the coefficients describing the amplification and the damping of the dust particle oscillations are analytically calculated around the equilibrium position, these coefficients allow us to find the relation between the plasma and dust parameters. The results obtained cover the discharge characteristics, the charge and the dynamics of the dust particle. It has been found that the driving frequency has a significant effect on not only the discharge properties but also on the damped oscillatory motion and the equilibrium position of the dust particle. Hence, these oscillations become closer to the electrodes with increasing driving frequency whereas the dust equilibrium position becomes relatively farther from the powered electrode when the dust size decreases.

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“…* lenaic.couedel@usask.ca, lenaic.couedel@univ-amu.fr However, due to the very nature of the complex plasma monolayer, complex plasma specific phenomena can occur. Because of the ion flow coming from the bulk plasma and directed towards the electrode, ion wakes are formed downstream of each microparticle [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Stability of two-dimensional complex plasma monolayers in asymmetric capacitively coupled radio-frequency discharges

Couëdel

Nosenko

2022

Phys. Rev. E

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In this article, the stability of a complex plasma monolayer levitating in the sheath of the powered electrode of an asymmetric capacitively coupled radio-frequency argon discharge is studied. Compared to earlier studies, a better integration of the experimental results and theory is achieved by operating with actual experimental control parameters such as the gas pressure and the discharge power. It is shown that for a given microparticle monolayer at a fixed discharge power there exist two threshold pressures: (i) above a specific pressure p cryst , the monolayer always crystallises; (ii) below a specific pressure p MCI , the crystalline monolayer undergoes the mode-coupling instability and the two-dimensional complex plasma crystal melts. In-between p MCI and p cryst , the microparticle monolayer can be either in the fluid phase or the crystal phase: when increasing the pressure from below p MCI , the monolayer remains in the fluid phase until it reaches p cryst at which it recrystallises; when decreasing the pressure from above p cryst , the monolayer remains in the crystalline phase until it reaches p MCI at which the mode-coupling instability is triggered and the crystal melts. A simple self-consistent sheath model is used to calculate the rf sheath profile, the microparticle charges and the microparticle resonance frequency as a function of power and background argon pressure. Combined with calculation of the lattice modes the main trends of p MCI as a function of power and background argon pressure are recovered. The threshold of the mode-coupling instability in the crystalline phase is dominated by the crossing of the longitudinal in-plane lattice mode and the out-of plane lattice mode induced by the change of the sheath profile. Ion wakes are shown to have a significant effect too.

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Dust charging in dynamic ion wakes

Cited by 30 publications

References 53 publications

Effect of ionization waves on dust chain formation in a DC discharge

Effect of ionization waves on dust chain formation in a DC discharge

Effect of driving frequency on dust particle dynamics in radiofrequency capacitive argon discharge

Stability of two-dimensional complex plasma monolayers in asymmetric capacitively coupled radio-frequency discharges

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