Dust coupling parameter of radio-frequency-discharge complex plasma under microgravity conditions

Zhukhovitskii, D. I.; Naumkin, V. N.; Khusnulgatin, A. I.; Molotkov, V. I.; Lipaev, A. M.

doi:10.1103/physreve.96.043204

Cited by 10 publications

(6 citation statements)

References 41 publications

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“…Depending on the discharge conditions, the dust system can pass through different phases like crystalline, hexatic, and liquid states [7,8]. The phased nature of the dusty plasma medium can be characterized by the Coulomb coupling parameter [9,10].…”

Section: Introductionmentioning

confidence: 99%

DPEx-II: a new dusty plasma device capable of producing large sized DC coulomb crystals

Arumugam¹,

Bandyopadhyay²,

Singh³

et al. 2021

Plasma Sources Sci. Technol.

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The creation of a spatially extended stable DC complex plasma crystal is a big experimental challenge and a topical area of research in the field of dusty plasmas. In this paper we describe a newly built and commissioned dusty plasma experimental (DPEx-II) device at the Institute for Plasma Research. The device can support the formation of large sized Coulomb crystals in a DC glow discharge plasma. The plasma in this L-shaped table-top glass chamber is produced between a circular anode and a long tray shaped cathode. It is characterized with the help of various electrostatic probes over a range of discharge conditions. The dust particles are introduced by a dust dispenser to form a strongly coupled Coulomb crystal in the cathode sheath region. The unique asymmetric electrode configuration minimizes the heating of dust particles and facilitates the formation of crystalline structures with a maximum achievable dimension of 40 cm × 15 cm using this device. A larger crystal has numerous advantages over smaller ones, such as higher structural homogeneity, fewer defects, lower statistical errors due to finite size effects etc. A host of diagnostics tools are provided to characterize the Coulomb crystal. Results of a few initial experiments aimed at demonstrating the technical capabilities of the device and its potential for future dusty plasma research, are reported.

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Section: Introductionmentioning

confidence: 99%

DPEx-II: a new dusty plasma device capable of producing large sized DC coulomb crystals

Arumugam¹,

Bandyopadhyay²,

Singh³

et al. 2021

Plasma Sources Sci. Technol.

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“…Note that no evidence of the crystalline anisotropy follows from figure 5: the polyhedron seems almost symmetric. The absence of anisotropy under compatible experimental conditions was noted in [30]. Note that all analyzed experimental domains (consisting of more than 100 particles) have the bcc structure.…”

Section: Identification Of the Crystallization Frontmentioning

confidence: 52%

“…The Coulomb coupling parameter measured for the runs without the depth scans proves to be almost constant in the region of front propagation and amounts to 54 for 10 Pa and to 49 for 15 Pa. Such a low value seems to be meaningful because for 2.55 µm diameter particles, Γ ∼ 150 and it drops with the decrease of the particle diameter [30]. Thus, we can conclude that we have measured the 3D velocity of the crystallization front propagating in complex plasma.…”

Section: Resultsmentioning

confidence: 90%

New approach to measurement of the three-dimensional crystallization front propagation velocity in strongly coupled complex plasma

Zhukhovitskii¹,

Naumkin²,

Molotkov³

et al. 2019

Plasma Sources Sci. Technol.

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The PK-3 Plus laboratory onboard the International Space Station is used to form complex plasma with a liquidlike particle subsystem in metastable state and to observe the propagation of crystallization fronts corresponding to the surfaces of crystal domains. We propose the "axis" algorithm of solidlike particles identification, which makes it possible to isolate different domains and their surfaces as well. Determination of the three-dimensional front velocity is based on its definition implying that there exists a small area of the domain surface propagating along some line perpendicularly to it. The velocity measured in this way is an important characteristic of the plasma crystallization kinetics. It proves to be almost independent of time and the direction of front propagation and amounts to ca. 60-80 µm s −1 .

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“…But the simplest proof of the Brownian motion of a dust particle in a RF plasma is that Gaussian distributions fit the experimental velocity distribution functions well in both the horizontal and vertical directions 50 , 56 , 57 . Note that in this case the corresponding kinetic temperatures ( ), which the microparticle acquires due to interaction with the anisotropic plasma sheath, do not equal for different directions ( ) 50 , 57 , 58 , and can substantially exceed the temperatures of neutrals, ions and even electrons 58 – 60 .…”

Section: Methodsmentioning

confidence: 94%

Experimental study of the nonreciprocal effective interactions between microparticles in an anisotropic plasma

Лисин

Петров

Sametov

et al. 2020

Sci Rep

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There is a variety of cases in nature when the action–reaction symmetry is broken. In particular, suitable conditions for this are realized in colloidal suspensions and complex plasmas. Since the first theories and simulations of the nonreciprocal effective interactions between microparticles in complex plasmas were published in 1995–1996, there have been hundreds of studies in the theoretical development of this theme. However, despite such a rich theoretical background, one of the important unsolved problems is a direct experimental determination of the nonreciprocal interparticle interaction forces. Here, we studied experimentally in detail the forces of the nonreciprocal effective interaction between microparticles suspended a radio-frequency produced plasma sheath. For this purpose, an experimental method based on an analysis of the spectral density of random processes in an open dissipative two-particle system was developed. In contrast to previous investigations, the proposed method takes into account random and dissipative processes in the system, does not require a special design of the experimental setup and any external perturbations, pre-measurements of external fields and any assumptions about the type of interaction. We found that even small charge changes of one particle, caused by its thermal motion in a wake field of another particle, can lead to a significant change in the effective (measurable) interaction between the particles.

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Dust coupling parameter of radio-frequency-discharge complex plasma under microgravity conditions

Cited by 10 publications

References 41 publications

DPEx-II: a new dusty plasma device capable of producing large sized DC coulomb crystals

DPEx-II: a new dusty plasma device capable of producing large sized DC coulomb crystals

New approach to measurement of the three-dimensional crystallization front propagation velocity in strongly coupled complex plasma

Experimental study of the nonreciprocal effective interactions between microparticles in an anisotropic plasma

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