Preservation of a Dust Crystal as it Falls in an Afterglow Plasma

Chaubey, Neeraj; Goree, J.

doi:10.3389/fphy.2022.879092

Cited by 20 publications

(12 citation statements)

References 75 publications

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“…In a cc-rf argon discharge at f rf = 13.56 MHz with an argon pressure p = 1.067 Pa, 8.69 μm diameter melamine spherical particles were levitated and formed and twodimensional plasma crystal. Then, the power was abruptly shut down, and the microparticles fell (note that the particle arrangement was not significantly altered during the fall [93]). In this experiment, due to the large value of the coupling capacitor, the negative self-bias of the powered electrode that develops naturally when the plasma is on (V dc ≃ − 150 V), decayed in a timescale of ~3 s, a time much longer than the plasma afterglow timescales, therefore, maintaining a large quasi dc electric field between the electrodes during the afterglow period.…”

Section: Dust Dynamics Dust Decharging and Residual Charges In Plasma...mentioning

confidence: 99%

Temporal dusty plasma afterglow: A review

Couëdel

2022

Front. Phys.

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In complex plasmas, dust particles are charged through their interactions with the electrons and ions of the surrounding plasma. In low-temperature laboratory plasmas, dust particles most commonly acquire a negative charge. In particular, in a laboratory glow-discharge plasma, the typical charge for a micrometer-size grain generally attains a few thousands of electronic charges. Under stable discharge conditions, this large negative charge is relatively well-characterized. However, for unsteady discharge conditions, the charge can differ and even fluctuate. In particular, when the power source of the discharge is turned off, the charged species of the plasma diffuse away and recombine into neutral species: this is a temporal afterglow. When dust particles are present inside a temporal plasma afterglow, the diffusion of charged species and the plasma decay dynamics are affected. Moreover, the dust particle charges also evolve during the afterglow period. In the late afterglow, dust particles are known to keep residual charges. The value of these residual charges strongly depends on the ambipolar-to-free diffusion transition. In addition, the presence of a constant electric field, causing ions to drift through the neutral gas, has a strong influence on the final dust particle residual charges, eventually leading to large positive residual charges. In this review article, the dynamics of temporal complex plasma afterglow are discussed. Experimental and theoretical results are presented. The basics of temporal afterglow modeling are also given.

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Section: Dust Dynamics Dust Decharging and Residual Charges In Plasma...mentioning

confidence: 99%

Temporal dusty plasma afterglow: A review

Couëdel

2022

Front. Phys.

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“…The study of dusty plasma crystals in various discharge configurations has been a hot research topic in the dusty plasma because of its wide scope in understanding various mediums at the kinetic level. [18,[32][33][34]96,97] Apart from neutral pressure and input rf power, the external magnetic field can also alter the characteristics of dust-plasma crystal. [64] The dust grains in a crystalline state perform random motion about their equilibrium position in the absence of an external B-field, but they have rotational motion if the magnetic field is introduced.…”

Section: Crystallization and Melting Of Dusty Plasma Crystalmentioning

confidence: 99%

“…However, nonconducting (Teflon/nylon) ring always remains in floating condition (floating potential), which could provide a better confinement to charged dust particles in strongly magnetized plasma. Thus, nonconducting confinement rings of appropriate radius and thickness should be used to perform dusty plasma experiments in strong B‐field. A recent experimental study by Chaubey et al [ 100–102 ] in after‐glow dusty plasma demonstrates the presence of large positive charges on the dust surface and their ability to be held above a lower powered (biased) electrode without the presence of a plasma background. If the levitated positively charged dust grains are exposed to the strong external magnetic field (few Tesla) then Lorentz force may act on them and start to gyrate (rotate) about B‐field lines in the plane perpendicular to B‐field.…”

Section: Potential Futuristic Steps To Get Magnetized Dusty Plasmamentioning

confidence: 99%

“…A cluster of charged dust particles (two-dimension or three-dimension) can be produced in experimental devices with the use of different discharge configurations. [13][14][15][16][17][18] The dust particles are normally confined in an electrostatic potential well created by such discharge configurations. When the density of dust grains in the electrostatic confining potential well crosses a threshold value, then long-range Coulombic interaction among negatively charged dust particles turns the cluster of particles to respond collectively with an internal or external perturbation.…”

Section: Introductionmentioning

confidence: 99%

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Magnetized dusty plasma: On issues of its complexity and magnetization of charged dust particles

Choudhary

2023

Contrib. Plasma Phys

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It is possible to excite various linear and nonlinear low‐frequency modes in dusty plasma, which is an admixture of electrons, ions, gas atoms, and negatively charged solid particles. The experimental as well as theoretical study of these low‐frequency dynamical modes in dusty plasma is very complex because of the involvement of dynamics of electrons, ions, and neutrals. If the external magnetic field is introduced to dusty plasma, then the dynamics of it will be more complex. The complexity of magnetized dusty plasma where plasma species (electrons and ions) are magnetized is discussed in detail by keeping the experimental findings in mind. The requirement of theoretical modeling, as well as computation experiments in understanding the dynamics of dusty plasma in the presence of a strong magnetic field, is suggested in the context of experimental findings. The major challenges to magnetizing the massive charged particles in plasma experiments and some proposed solutions are discussed in this review report.

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“…In Earth-based experiments, due to the macroscopic size, the dust particles normally levitate close to the lower electrode, in the plasma sheath, where the gravitational force is balanced by the sheath electric force. In addition, the repulsive Yukawa interaction (the expansion) is commonly balanced by applying an external magnetic field [25][26][27][28][29] or by externally applied radial confinement potential [30],…”

Section: Introductionmentioning

confidence: 99%

Ring structural transitions in strongly coupled dusty plasmas

Dharodi¹,

Kostadinova²

2023

Preprint

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This paper presents a numerical study of ring structural transitions in strongly coupled dusty plasma confined in a ring-shaped (quartic) potential well with a central barrier, whose axis of symmetry is parallel to the gravitational attraction. It is observed that increasing the amplitude of the potential leads to a transition from a ring monolayer structure (rings of different diameters nested within the same plane) to a cylindrical shell structure (rings of similar diameter aligned in parallel planes). In the cylindrical shell state, the rings alignment in the vertical plane exhibits hexagonal symmetry. The ring transition is reversible, but exhibits hysteresis in the initial and final particle positions. As the critical conditions for the transitions are approached, the transitional structure states exhibit zigzag instabilities or asymmetries on the ring alignment. Furthermore, for a fixed amplitude of the quartic potential that results in a cylinder-shaped shell structure, we show that additional rings in the cylindrical shell structure can be formed by decreasing the curvature of the parabolic potential well, whose axis of symmetry is perpendicular to the gravitational force, increasing the number density, and lowering the screening parameter. Finally, we discuss the application of these findings to dusty plasma experiments with ring electrodes and weak magnetic fields.

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Preservation of a Dust Crystal as it Falls in an Afterglow Plasma

Cited by 20 publications

References 75 publications

Temporal dusty plasma afterglow: A review

Temporal dusty plasma afterglow: A review

Magnetized dusty plasma: On issues of its complexity and magnetization of charged dust particles

Ring structural transitions in strongly coupled dusty plasmas

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