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

Matthews, L. S.; Vermillion, Katrina; Hartmann, P.; Rosenberg, M.; Rostami, S. Hesami; Kostadinova, Eva; Hyde, Truell; Pustylnik, Mikhail; Lipaev, A. M.; Usachev, A. D.; Zobnin, A.; Thoma, Markus H.; Петров, О. Ф.; Thomas, Hubertus M.; Novitskii, O.V.

doi:10.1017/s0022377821001215

Cited by 13 publications

(3 citation statements)

References 32 publications

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“…It should be noted that metastable states obtained upon oscillation of the electric field were previously observed in plasma with microparticles at cryogenic gas temperature [27]. The ionization waves not only affect the development of dust instabilities, but also cause the formation of stable dust structures similar to the string-like structures observed in the PK-˙4 experiment [61].…”

Section: Stable and Metastable States Of Complex Plasmamentioning

confidence: 54%

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Polyakov¹,

Шумова²,

Vasilyak³

2022

Plasma Sources Sci. Technol.

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We consider the efficiency of an ion confinement inside a cloud of charged microparticles in a low-pressure DC discharge. To describe the ion confinement efficiency in such complex plasma, we propose the indicators calculated taking into account the processes responsible for the generation, the losses, and the accumulation of ions in a cloud of charged microparticles in a plasma using a fluid model. The efficiency of ion accumulation by a microparticle cloud shows the ratio of the average ion densities in discharge with microparticles and without them. The efficiency of ion accumulation by a microparticle shows the difference of average ion densities in a discharge with microparticles and without them, related to microparticle number density. The specific power costs of the existence of one ion in a microparticle cloud determines the linear power costs of the discharge in a cloud related to the linear number of ions in it. The power efficiency of ion accumulation by a microparticle cloud is defined as a ratio of specific power costs in a discharge without microparticles, to specific power costs of ion existence in a cloud. A strong dependence of indicators on the microparticle number density has been revealed. Inefficient conditions of ion confinement inside a cloud are found. Experimental data on dynamic instabilities of a discharge with microparticles was analyzed. It is found that efficiency of ion confinement is connected with dynamic processes in complex plasma. The limiting microparticle number density is shown to serve as the criterion of the occurrence of plasma instability. Exceeding the limiting microparticle number density results, generally, in the development of dynamic instability of complex plasma, and, in inefficient states, in quenching of the discharge.

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Section: Stable and Metastable States Of Complex Plasmamentioning

confidence: 54%

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Polyakov¹,

Шумова²,

Vasilyak³

2022

Plasma Sources Sci. Technol.

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“…The molecular dynamics simulation DRIAD is capable of modeling the dynamics of the ions and dust and selfconsistently calculating the dust charge [16,36,37]. To a good approximation, the electrons can be treated as having a Boltzmann distribution if the dust surface potential is negative enough to reflect most electrons [38].…”

Section: Driad and Use Of Experimental Data For Model Inputsmentioning

confidence: 99%

“…The molecular dynamics simulation dynamic response of ions and dust (DRIAD) [16,[35][36][37] is used to determine dust charge and ion wake characteristics for a set of parameters simulating the different experimental conditions described in Couëdel and Nosenko [23]. Plasma parameters that are unknown or not easily measured (including the sheath electric field, electron temperature, ion and electron number density, and ion flow speed) are determined through the iterative approach described in section 3.…”

Section: Introductionmentioning

confidence: 99%

Dependence of ion wake characteristics on experimental conditions

Banka

Vermillion

Matthews

et al. 2023

Plasma Phys. Control. Fusion

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Two-dimensional microparticle crystals can be formed in the sheath of a gas discharge plasma. Ions from the bulk plasma are accelerated in the sheath electric field, flowing past the grains to create a positive ion wake downstream from the grains. Interaction between the ion wake and neighboring grains creates additional coupling between oscillation modes and can trigger mode-coupling instability (MCI). In order to better understand MCIs, the interaction between dust grains and ion wakes must be understood; however, the relationship between the discharge parameters and ion wake characteristics is unknown. A molecular dynamics simulation of ion dynamics and dust charging is used to self-consistently determine the dust charge and ion wake characteristics for different synthetic experimental conditions. It is found that the ion wake is strongly dependent on the background gas pressure but not affected much by the discharge power.

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Plasma charge force near the dust particles chain levitated in a gas-discharge

Salnikov,

Fedoseev,

Sukhinin

2023

E3S Web Conf.

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In the current paper a numerical study of the forces acting of a one-dimensional chain of three dust particles levitating in the near-electrode layer of a gas discharge plasma is presented. In the described model dust particle motion is calculated in consideration of the action of gravity, external electric field, the Coulomb repulsion and the force induced by plasma space charge. The dependences of the dust particles charges and their position in space on the mean value of external electric field were calculated. The investigation showed the effect of discharging dust particles in the chain due to ion focusing. The spatial distribution of forces acting on the dust particle chain has been studied. It is noted that the Coulomb repulsion force relative to the center of the chain loses its symmetry with an increase in the mean electrostatic field. It is shown that the displacement of a chain of dust particles is determined by the force induced by the plasma space charge.

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

Cited by 13 publications

References 32 publications

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Ion confinement efficiency and ionization balance in a complex DC discharge plasma

Dependence of ion wake characteristics on experimental conditions

Plasma charge force near the dust particles chain levitated in a gas-discharge

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