Effect of large-angle scattering, ion flow speed and ion-neutral collisions on dust transport under microgravity conditions

Land, Victor; Goedheer, W. J.

doi:10.1088/1367-2630/8/1/008

Cited by 46 publications

(55 citation statements)

References 29 publications

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“…Despite the fact that the found value for the total ion-drag force lays well within the range of ion-drag forces published in the literature [4,8], comparison of the results obtained here with that obtained in the literature is rather difficult. The reason for this is the fact that all measurements and numerical simulations published so far have the necessity to make assumptions about the available models (e.g., shielding length, influence of collisions) and/or the need to measure or "guess" other plasma parameters such as the local ion velocity, electrical field, and plasma density.…”

Section: Results and Interpretationsupporting

confidence: 69%

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Absolute measurement of the total ion-drag force on a single plasma-confined microparticle at the void edge under microgravity conditions

2013

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We present an absolute measurement of the total ion-drag force on one single microparticle at the edge of the dust free region in low pressure complex plasmas: the void. In order to do so, the particle confinement position was monitored as a function of the gas pressure for two particle sizes under normal gravity conditions and under microgravity conditions during parabolic flights. At the border of the void, the ion-drag force on a particle with a radius of 4.90 μm appeared to be (3.6 ± 0.3) × 10 −12 N.

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Section: Results and Interpretationsupporting

confidence: 69%

“…Voids have been recognized in both laboratory plasmas [1,2] and complex plasmas under microgravity conditions [3][4][5]. In addition to experiments, the formation of voids has been extensively studied theoretically and by means of computer simulations [6][7][8]. At the edges of such voids, force equilibrium on the dust particles applies.…”

Section: Introductionmentioning

confidence: 99%

Absolute measurement of the total ion-drag force on a single plasma-confined microparticle at the void edge under microgravity conditions

2013

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“…[28]. The microparticles were treated as a fluid within the drift-diffusion model considered previously in a number of works [29][30][31][32][33]. The details of the model for each component are given below.…”

Section: Model a Basic Equationsmentioning

confidence: 99%

Capacitively coupled rf discharge with a large amount of microparticles: Spatiotemporal emission pattern and microparticle arrangement

et al. 2017

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The effect of micron-sized particles on a low-pressure capacitively-coupled rf discharge is studied both experimentally and using numerical simulations. In the laboratory experiments, microparticle clouds occupying a considerable fraction of the discharge volume are supported against gravity with the help of the thermophoretic force. The spatiotemporally resolved optical emission measurements are performed with different arrangements of microparticles. The numerical simulations are carried out on the basis of a one-dimensional hybrid (fluid-kinetic) discharge model describing the interaction between plasma and microparticles in a self-consistent way. The study is focused on the role of microparticle arrangement in interpreting the spatiotemporal emission measurements. We show that it is not possible to reproduce simultaneously the observed microparticle arrangement and emission pattern in the framework of the considered one-dimensional model. This disagreement is discussed and attributed to two-dimensional effects, e.g., radial diffusion of the plasma components.

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“…These fluid models suffer from the problem that the time scale of the microparticle dynamics is much larger than that of the plasma, and the simulation typically switches periodically between advancing the plasma fluid and advancing the microparticle fluid, until an equilibrium is reached [12,10]. The microparticles and the plasma are coupled via the Poisson equation and the forces acting on the microparticles.…”

Section: Introductionmentioning

confidence: 99%

Simulating the dynamics of complex plasmas

Schwabe

Graves

2013

Phys. Rev. E

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Complex plasmas are low temperature plasmas that contain micrometer-sized particles in addition to the neutral gas particles and the ions and electrons that make up the plasma. The microparticles interact strongly and display a wealth of collective effects. Here, we report on linked numerical simulations that reproduce many of the experimental results of complex plasmas. We model a capacitively coupled plasma with a fluid code written for the commercial package COMSOL. The output of this model is used to calculate forces on microparticles. The microparticles are modeled using the molecular dynamics package LAMMPS, which we extended to include the forces from the plasma. Using this method, we are able to reproduce void formation, the separation of particles of different sizes into layers, lane formation, vortex formation and other effects.

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Effect of large-angle scattering, ion flow speed and ion-neutral collisions on dust transport under microgravity conditions

Cited by 46 publications

References 29 publications

Absolute measurement of the total ion-drag force on a single plasma-confined microparticle at the void edge under microgravity conditions

Absolute measurement of the total ion-drag force on a single plasma-confined microparticle at the void edge under microgravity conditions

Capacitively coupled rf discharge with a large amount of microparticles: Spatiotemporal emission pattern and microparticle arrangement

Simulating the dynamics of complex plasmas

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