The plasma inside a dust free void: hotter, denser, or both?

Land, Victor; Goedheer, W. J.

doi:10.1088/1367-2630/9/8/246

Cited by 54 publications

(61 citation statements)

References 31 publications

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“…DISCUSSION AND CONCLUSION Our first main finding, i.e., an increased overall glow, is consistent with recent fluid simulations of a dusty plasma under microgravity conditions [11]. It was predicted that, in large dust clouds with a central void, the immense loss of plasma to the particles is compensated by an enhanced ionization due to increased electron temperature and density.…”

Section: Resultssupporting

confidence: 91%

Experimental Investigation of Dust Density Waves and Plasma Glow

Arp

Caliebe

Menzel

et al. 2010

IEEE Trans. Plasma Sci.

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Abstract-Dust density waves (DDWs) are compressional modes that are often excited by subsonic ion flows in dusty plasmas. Previous experiments relying on imaging of only the dust revealed that they can propagate parallel to the ion flow direction or at an oblique angle. An experiment was performed using microgravity conditions on parabolic flights with video imaging of both the dust and the plasma glow. Glow arises from electron-impact excitation of neutral gas atoms, and it serves as a signature of energetic electrons. Averaging over time, it was found that the presence of dust enhances the glow brightness everywhere in the plasma. Resolving the time variation, a spontaneously excited DDW was observed at 3.9 Hz. It was characterized not only by a compression of the dust number density but also by a modulation of the glow intensity. The correlation between the wave and the glow is analyzed by Fourier methods. We found an unexpected phase relation between the plasma glow and the DDW of 118• . A glow maximum is followed by a dust density maximum.

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Section: Resultssupporting

confidence: 91%

Experimental Investigation of Dust Density Waves and Plasma Glow

Arp

Caliebe

Menzel

et al. 2010

IEEE Trans. Plasma Sci.

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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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“…The assumed mechanism to explain these regions are related to the equilibrium between the inward electrostatic force and the outward ion drag force. Dust voids are still actively studied (see for example [20,21] and references therein). They are experimentally observed in various dusty plasmas both under microgravity conditions or in the laboratory.…”

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confidence: 99%