Basic Processes in Complex (Dusty) Plasmas: Charging, Interactions, and Ion Drag Force

Khrapak, S. A.; Morfill, G. E.

doi:10.1002/ctpp.200910018

Cited by 155 publications

(133 citation statements)

References 149 publications

(272 reference statements)

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“…Although, the effect of ion-neutral collisions on the particle charging has received considerable attention [31][32][33][34][35][36][37] (for a review see Ref. [10]), most of the studies have concentrated on isotropic conditions. To the best of our knowledge there is very few papers, which reports results for ion collection by a sphere in a drifting collisional plasma [38,39].…”

Section: Model Of Particle Chargingmentioning

confidence: 99%

“…The problem of plasma-particle interactions is central to this field, because these interactions govern practically all phenomena that can be observed and investigated [7][8][9]. Of particular importance are interactions that affect particle charging and screening [9,10], momentum transfer between different complex plasma components [11], external and internal forces acting on the particles [9].…”

Section: Introductionmentioning

confidence: 99%

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Particle flows in a dc discharge in laboratory and microgravity conditions

et al. 2013

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We describe a series of experiments on dust particles flows in a positive column of a horizontal dc discharge operating in laboratory and microgravity conditions. The main observation is that the particle flow velocities in laboratory experiments are systematically higher than in microgravity experiments, for otherwise identical discharge conditions. The paper provides an explanation for this interesting and unexpected observation. The explanation is based on a physical model, which properly takes into account main plasma-particle interaction mechanisms relevant to the described experimental study. Comparison of experimentally measured particle velocities and those calculated using the proposed model demonstrates reasonable agreement, both in laboratory and microgravity conditions, in the entire range of discharge parameters investigated.

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Section: Model Of Particle Chargingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Particle flows in a dc discharge in laboratory and microgravity conditions

et al. 2013

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“…Clearly, the idealized model described above oversimplifies considerably the actual rather complex interactions between the particles in real complex plasmas [22,44,45], although some experimentally observed trends can be reproduced by this simple consideration, at least qualitatively. However, more important in the present context is that simplifications involved make it possible to perform a direct comparison with the results obtained using other approaches (such as QLCA and MD).…”

Section: Introductionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

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The conventional fluid description of multi-component plasma, supplemented by an appropriate equation of state for the macroparticle component, is used to evaluate the longitudinal sound velocity of Yukawa fluids. The obtained results are in very good agreement with those obtained earlier employing the quasi-localized charge approximation and molecular dynamics simulations in a rather broad parameter regime. Thus, a simple yet accurate tool to estimate the sound velocity across coupling regimes is proposed, which can be particularly helpful in estimating the dust-acoustic velocity in strongly coupled dusty (complex) plasmas. It is shown that, within the present approach, the sound velocity is completely determined by particle-particle correlations and the neutralizing medium (plasma), apart from providing screening of the Coulomb interaction, has no other effect on the sound propagation. The ratio of the actual sound velocity to its "ideal gas" (weak coupling) scale only weakly depends on the coupling strength in the fluid regime, but exhibits a pronounced decrease with the increase of the screening strength. The limitations of the present approach in applications to real complex plasmas are briefly discussed.

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“…In this case the charge is negative and proportional to the product of the grain radius and the electron temperature, viz. Q = −z(aT e /e), where z is the coefficient of order unity, which depends on the plasma parameter regime [4]. In the absence of substantial ion flows and strong nonlinearities in ion-grain interaction, the screening length is approximately given by the ion Debye radius λ ≃ λ Di = T i /4πe 2 n i , provided T e ≫ T i .…”

Section: Formulationmentioning

confidence: 99%

Electron and ion thermal forces in complex (dusty) plasmas

Khrapak

2013

Physics of Plasmas

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Expressions for the ion and electron thermal forces acting on a charged grain, suspended in a weakly ionized plasma subject to temperature gradients, are derived. The main emphasize is on the conditions pertinent to the investigations of complex (dusty) plasmas in gas discharges. Estimates show that for the electron temperature gradients ∼ O(eV/cm) typically encountered in laboratory gas discharges, the electron thermal force can become an important player among other forces acting on micron-size grains.

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Basic Processes in Complex (Dusty) Plasmas: Charging, Interactions, and Ion Drag Force

Cited by 155 publications

References 149 publications

Particle flows in a dc discharge in laboratory and microgravity conditions

Particle flows in a dc discharge in laboratory and microgravity conditions

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Electron and ion thermal forces in complex (dusty) plasmas

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