Fine-particle Coulomb lattices formed and controlled in DC discharge plasmas

Sato, Noriyoshi; Ozaki, Ryoichi; Iizuka, Satoru

doi:10.1063/1.56673

Cited by 9 publications

(3 citation statements)

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“…Here, the use of the double plasma source enabled finer control of the potential structure of the plasma allowing a variety of particle cloud shapes to be generated in the plasma. Additionally, these experiments gave some early indications of the role of plasma (ion or electron) flows in controlling the structure and dynamics of dusty plasmas [69]. Finally, the author's group at Auburn University (US) has also made extensive use of the anodic dc glow discharge configuration.…”

Section: Anodic Dischargementioning

confidence: 97%

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Thomas¹

2009

Contrib. Plasma Phys.

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The study of dusty plasmas in dc‐generated plasmas is a broad topic because of the wide variety of experimental configurations that fall under the category of “dc plasma source”. Experimental configurations such as the hot filament discharge, anodic (anode/cathode) discharge, and Q‐machine are all variations of the “dc plasma source” in which extensive studies of dusty plasmas have been performed. This paper will review dusty plasma investigations in these plasma sources. First, an introduction to each of these configurations and representative examples of each one will be given. This will be followed by a discussion of microparticle confinement in each of these configurations. Then, key results from dusty plasma investigations using these devices will be discussed. Specific emphasis will be placed on studies of: microparticle charging, particle cloud morphology, dust‐driven and dust‐modified waves, and strongly coupled effects. Some remarks on emerging research areas will be given at the end (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Anodic Dischargementioning

confidence: 97%

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Thomas¹

2009

Contrib. Plasma Phys.

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“…Our experiment has been carried out using completely direct current ͑dc͒ plasma configuration. 12,13 Being different from the rf discharge plasmas, it is easy to modify the spatial profiles in dc discharge plasmas. In this paper, we present the effect of an asymmetrical potential structure on the dust-particle motion in dc discharge plasma, where the potential profile in the dust-particle levitation region is actively controlled by a small metal plate to which dc potentials can be applied.…”

Section: Introductionmentioning

confidence: 99%

Generation of two-dimensional dust vortex flows in a direct current discharge plasma

et al. 2009

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The two-dimensional dust vortex flows are observed in a direct current discharge plasma near the edge of a metal plate which is situated in the dust-particle levitation region. Applying negative dc potential to the metal plate, dust particles are strongly accelerated toward the metal plate edge, and two symmetric dust vortex flows are generated on both sides of the metal plate. Numerical calculation including the effect of the ion drag force well demonstrates the dust vortex formation as in the experiment. A mechanism of the dust vortex generation could be explained by effect of an asymmetry of ion drag force near the metal plate.

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“…14,15 In our experiment, fine particles of micron size are injected into a completely direct current ͑dc͒ plasma system. [16][17][18] Therefore, the system is quite simple for the control of a sheath structure compared to the capacitively coupled rf plasmas. The structure of the Coulomb crystal is analyzed for single layer of fine particles in the simple dc sheath by adopting an electron shower method to investigate the phase transition.…”

Section: Introductionmentioning

confidence: 99%

Liquid-crystal phase transition by electron shower in a direct current complex plasma

Iizuka

Sato

2009

Physics of Plasmas

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The Coulomb crystal of strongly coupled fine particles is formed by electron shower in a direct current discharge plasma, where the electron shower is injected from an auxiliary plasma which is situated below a main plasma. In case of electron shower injection, the phase transition of dust particles is controlled under the constant argon pressure. The characteristic properties of electron shower injection are discussed theoretically by using a simple collisional sheath model. The calculation analysis clearly shows that electron injection causes the change in charges on fine particles, resulting in a liquid-solid phase transition as in the experiment.

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Fine-particle Coulomb lattices formed and controlled in DC discharge plasmas

Cited by 9 publications

References 0 publications

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Generation of two-dimensional dust vortex flows in a direct current discharge plasma

Liquid-crystal phase transition by electron shower in a direct current complex plasma

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