The project ‘Plasmakristall-4’ (PK-4)—a new stage in investigations of dusty plasmas under microgravity conditions: first results and future plans

Фортов, В. Е.; Morfill, G. E.; Петров, О. Ф.; Thoma, Markus H.; Usachev, A. D.; Hoefner, H.; Zobnin, A.; Kretschmer, M.; Ratynskaia, S.; Fink, M.; Tarantik, Karina R.; Gerasimov, Yu. V.; Esenkov, V.

doi:10.1088/0741-3335/47/12b/s39

Cited by 79 publications

(70 citation statements)

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“…Our simulation parameters are for the PK-4 instrument [4]. We use microsphere dust particles of radius 3.43 μm and m p = 2.55 × 10 −13 kg, with neon gas at 50 Pa pressure and 0.03 eV temperature so that ν g = 51 s −1 .…”

Section: Abstract-mentioning

confidence: 99%

“…Here a = (3/4πn d ) 1/3 is the Wigner-Seitz radius, n d is the number density of dust particles, and T d is the particle kinetic temperature. For the coupling parameter > 1, the dust component is said to be strongly coupled, and dust particles can self-organize like atoms in a solid or liquid and sustain waves [2], [3].Our simulation parameters are for the PK-4 instrument [4]. We use microsphere dust particles of radius 3.43 μm and m p = 2.55 × 10 −13 kg, with neon gas at 50 Pa pressure and 0.03 eV temperature so that ν g = 51 s −1 .…”

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Simulation of Three-Dimensional Dusty Plasmas

Liu

Goree

2014

IEEE Trans. Plasma Sci.

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Abstract-for the j th particle includes electrostatic forces due to particleparticle interaction φ jl , a confinement potential , gas friction −ν g m pṙ j , and random Brownian force ζ g j due to gas molecules. Here, m p is the particle mass and ν g is the gas friction constant. We model the interparticle potential as a pairwise Yukawa potential, φ jl (r jl ) = (Q 2 /4πε 0 r jl )e −r jl /λ D for identical dust particles of charge Q with a screening length λ D due to the electrons and ions. The collection of dust particles can be characterized by two dimensionless parameters: the Coulomb coupling parameter = Q 2 /4πε 0 ak B T d and the screening parameter κ = a/λ D . Here a = (3/4πn d ) 1/3 is the Wigner-Seitz radius, n d is the number density of dust particles, and T d is the particle kinetic temperature. For the coupling parameter > 1, the dust component is said to be strongly coupled, and dust particles can self-organize like atoms in a solid or liquid and sustain waves [2], [3].Our simulation parameters are for the PK-4 instrument [4]. We use microsphere dust particles of radius 3.43 μm and m p = 2.55 × 10 −13 kg, with neon gas at 50 Pa pressure and 0.03 eV temperature so that ν g = 51 s −1 . We assume Q = −8520e, n d = 3 × 10 4 cm −3 , and λ D = 8.3 × 10 −3 cm. The characteristic interparticle distance is a = 0.020 cm, so that κ = 2.4. The characteristic time for particle motion is ω p = 157 rad/s, whereWe chose T d = 8.3 eV, corresponding to ≈ 63. For these values of and κ, the collection of dust particles is predicted Results shown in Fig. 1(a) reveal the structural arrangement of the dust particles at a time during the simulation. This image was prepared by plotting the simulated particles in a 3-D coordinate system, with a sphere representing each particle. In this structure, each particle is in a cage defined by its nearest neighbors, but the structure is irregular, not crystalline. A video can be seen at [6] showing similar particles as shown in Fig. 1(a) from a rotating viewpoint.To quantify the order of the 3-D structure, we calculate the pair correlation function g(r ) [7], [8]. For this liquid, g(r ) has only one distinctive peak in Fig. 1(b), indicating short-range translational order.We characterize the dynamics using a wave spectrum. We start by using the particle position r j (t) and velocitẏ r j (t) to calculate the time series of the so-called longitudinal current, for a specified wave vector kThe spectral power | J L (k, ω)| 2 is then computed as the square modulus of the Fourier transformation in time of J L (k, t).Results in Fig. 1(c) show that, as expected, the spectral power is concentrated along a curved band. The band has a great width in the ω-k space due to damping, arising from gas friction and the viscous motion of dust particles.The band of spectral power in Fig. 1(c) corresponds to a real dispersion relation curve, which we plot in Fig. 1(c) as a dotted line. We determined this dispersion curve as the peak of the spectral power |J L (k, ω)| 2 ; to reduce the uncertainty, we compu...

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confidence: 99%

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Simulation of Three-Dimensional Dusty Plasmas

Liu

Goree

2014

IEEE Trans. Plasma Sci.

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“…The experiments were performed on a board of special plain A-300 ZERO-G (NOVESPACE, France) during the ESA Parabolic Flight Campaign #45 (October, 2006) with the "Plasma Kristall-4" facility [1]. Period of microgravity was -22 sec.…”

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“…The rod orientations with respect to the tube axis were used to measure the radial ambipolar electric field supposing that the conductive microrods are orienting along the local permanent electric field E due to the rod polarization. Knowing the longitudinal electric field from the probe measurements {EL = 2.1 V/cm) [1] and the angle between rod axis and the tube axis one can determine the radial electric field strength ER (Fig. 3).…”

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Structural and Dynamical Properties of Microrod Dusty Plasma in a Uniform DC Discharge under Microgravity.

Usachev¹,

Höfner

Thoma

et al. 2008

AIP Conference Proceedings

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In present experiment an ordering and dynamics of monodisperse nylon rods (Z)=10[im, Z=300 [im) in a uniform DC gas discharge plasma under microgravity have been investigated. Ordered rod structures were registered in DC discharge with a rod concentration of 400 -8000 cm"^ and a neon pressure range of 20-50 Pa. The structures revealed orientationally ordered hexagonal structures. DC discharge became unstable at rod number density more then 8000 cm"^. Rod drift velocities in a permanent electric field were measured for the neon pressure range. Dust acoustic instability (v~ 0.4±0.1 Hz, A ~ 1.1±0.4 cm, CDAW ~ 0-5 cm/s) in rod cloud was observed at a neon pressure of 25 Pa and a rod number density of 1500 cm"^. Using the "low" frequency approximation of the linearized DAW dispersion relation and the measured rod drift velocity a rod electric charge had been estimated as ZR ~ 150000e.

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“…PK-4 PROJECT P K-4 IS A joined project between the Max-Planck-Institute for Extraterrestrial Physics (MPE) and the Institute for High Energy Densities (IHED) for investigating complex plasmas in a dc discharge using an elongated glass chamber with a length of 35 cm and a diameter of 3 cm [1]. A sketch of the setup is shown in Fig.…”

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PK-4: Complex Plasmas in Space—The Next Generation

Thoma

Fink

Höfner

et al. 2007

IEEE Trans. Plasma Sci.

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PK-4 is an experiment designed to investigate complex plasmas in a combined dc/RF discharge under microgravity conditions on board of the International Space Station. The dc discharge is produced in a glass tube with a length of 35 cm and a diameter of 3 cm. In addition, an RF discharge can be applied by external RF coils. The setup is especially suited for studying the liquid phase of the complex plasmas, e.g., flow phenomena such as turbulence or nozzles, and forces acting on the microparticles. Experiments in the laboratory and in parabolic flights have been used to determine the charge of the microparticles as well as the ion drag force acting on them.Index Terms-Complex plasmas, dc/rf discharge, fluid simulation.

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The project ‘Plasmakristall-4’ (PK-4)—a new stage in investigations of dusty plasmas under microgravity conditions: first results and future plans

Cited by 79 publications

References 20 publications

Simulation of Three-Dimensional Dusty Plasmas

Simulation of Three-Dimensional Dusty Plasmas

Structural and Dynamical Properties of Microrod Dusty Plasma in a Uniform DC Discharge under Microgravity.

PK-4: Complex Plasmas in Space—The Next Generation

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