A5022056318- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- High-pressure geophysics and materials
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Plasma Applications and Diagnostics
- Lightning and Electromagnetic Phenomena
- Vacuum and Plasma Arcs
- Spectroscopy and Laser Applications
- Combustion and flame dynamics
- Algebraic Geometry and Number Theory
- Polynomial and algebraic computation
- Particle Dynamics in Fluid Flows
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Atomic and Molecular Physics
- Inorganic Fluorides and Related Compounds
- Advanced Combustion Engine Technologies
- Commutative Algebra and Its Applications
- Magnetic confinement fusion research
- Heat transfer and supercritical fluids
- Cold Atom Physics and Bose-Einstein Condensates
- Granular flow and fluidized beds
Joint Institute for High Temperatures
2013-2025
National Research University Higher School of Economics
2013-2022
HUN-REN Wigner Research Centre for Physics
2022
Institute for Solid State Physics and Optics
2022
Baylor University
2022
Auburn University
2022
Gagarin Research and Test Cosmonaut Training Center
2022
Moscow Institute of Physics and Technology
2022
University of California, San Diego
2022
Plasma (Russia)
2021
An experimental determination of particle charge in a bulk dc discharge plasma covering wide range neutral gas pressures, was recently reported [S. Ratynskaia, Phys. Rev. Lett. 93, 085001 (2004)]. The charges obtained were several times smaller than the predictions collisionless orbital motion limited theory. This discrepancy attributed to effect ion-neutral collisions. In present paper more detailed description this experiment is provided and additional results with particles different...
The charge of dust particles is determined experimentally in a bulk dc discharge plasma the pressure range 20--100 Pa. obtained by two independent methods: one based on an analysis particle motion stable flow and another transition to unstable regime. Molecular-dynamics simulations charging for conditions similar those experiment are also performed. results both experimental methods demonstrate good agreement. several times smaller than predicted collisionless orbital theory, thus serve as...
New complex-plasma facility, Plasmakristall-4 (PK-4), has been recently commissioned on board the International Space Station. In complex plasmas, subsystem of μm-sized microparticles immersed in low-pressure weakly ionized gas-discharge plasmas becomes strongly coupled due to high (103-104 e) electric charge microparticle surface. The is available for observation at kinetic level, which makes appropriate particle-resolved modeling classical condensed matter phenomena. main purpose PK-4...
We describe a series of experiments on dust particles flows in positive column horizontal dc discharge operating laboratory and microgravity conditions. The main observation is that the particle flow velocities are systematically higher than experiments, for otherwise identical paper provides an explanation this interesting unexpected observation. based physical model, which properly takes into account plasma-particle interaction mechanisms relevant to described experimental study....
Abstract Low‐pressure gas discharge plasmas are known to be strongly affected by the presence of small dust particles. This issue plays a role in investigations particle‐forming plasmas, where dust‐induced instabilities may affect properties synthesized Also, discharges with large amounts microparticles used microgravity experiments, coupled subsystems charged represent particle‐resolved models liquids and solids. In this field, deep understanding dust–plasma interactions is required...
An analysis of lattice wave spectra in a three-dimensional dusty plasma structure formed direct current gas discharge with alternating polarity under microgravity conditions is reported. The are determined using the Fourier transform microparticle velocities, measured by tracking microparticles subpixel resolution. Both longitudinal and transverse modes detected analyzed. absence "k-gap" long-wavelength domain mode strongly suggests that form solid structure. Therefore, experimental compared...
Abstract This study investigates the influence of particle charge and electrorheological effects on microparticle dynamics dust-acoustic wave (DAW) propagation in low-pressure complex plasmas under microgravity conditions. Experiments were conducted using PK-4 during parabolic flights onboard International Space Station (ISS) to analyze dust behavior direct current (DC) polarity switching (DC-PS) discharge plasma. Key findings reveal that variations potential significantly affect dynamics,...
В работе получено новое интегральное представление для квадрата модуля дзета-функции Римана, получена оценка преобразования Лапласа остаточного члена $E_\sigma(T)$ и среднего по функции Гаусса. Библиография: 6 названий.
The PK-4 experiment is a continuation of the successful dusty plasma experiments PK-1, PK-2 and PK-3 conducted on board orbital space stations Mir International Space Station. For all these it important to avoid strong influence gravity, exerting an external stress system. Whereas Plus are using planar rf capacitive discharge, studies complex plasmas in long cylindrical chamber with combined dc/rf discharge. Such configuration will provide particular advantage for investigation different...
Abstract The PK-4 laboratory consists of a direct current plasma tube into which microparticles are injected, forming complex plasma. acquire many electrons from the ambient and thus highly charged interact with each other. If ion streams present, wakes form downstream microparticles, lead to an attractive term in potential between triggering appearance microparticle strings modifying electrorheological form. Here we report on set experiments compressional waves such string fluid during...
A spontaneous excitation of a grain density wave in dusty cloud monodisperse particles suspended at the diffuse edge an rf inductive gas discharge has been discovered. The main physical parameters this (phase velocity, wavelength, and growth rate) background plasma (distributions electron density, temperature, space potential) were measured. theoretical model observable phenomenon based on theory dust acoustic waves collisional correlates well with experimental data broad range conditions....
The ion flux on a small attractive sphere (the radius is much less than the Debye length) and electric potential distribution around charged in stationary weakly ionized plasma are calculated by direct solution of kinetic equation with Bhatnagar–Gross–Krook collision term. Only weak dependence electron temperature found. An analytical approximation current–voltage characteristics proposed for intermediate collisionalities, where neither collisionless theory nor continuum fluid approach...
The charges of μm-size particles in the quasineutral bulk plasma a dc discharge are determined experimentally pressure range between 100 and 500 Pa, spanning transition weakly collisional highly (hydrodynamic) regimes, where ion mean free path drops below screening length. charge is using force balance condition from measured particle drift velocities stable flows. A simple interpolation formula for flux to grain transitional regime shown fit quite well experimental results.
A method for measuring the interactions of charged dust particles within a three-dimensional cloud in plasma is presented. The measurements have been performed with help gravity-driven heavy probe particles, which moved through levitating at diffuse edge an inductively coupled rf discharge plasma. Assuming screened Coulomb potential surrounding each particle, both particle charge and effective screening length were calculated from analysis elastic 20, 30, 50 Pa neon pressure. basic...
Self-organization of dust grains into stable filamentary structures (or “chains”) largely depends on dynamic interactions between individual charged and complex electric potential arising from the distribution charges within a local plasma environment. Recent studies have shown that positive column gas discharge in Plasmakristall-4 (PK-4) experiment at International Space Station supports presence fast-moving ionization waves, which lead to variations parameters by up an order magnitude...
The ion-drag force acting on dust particles in the positive column of a dc discharge is measured pressure range 20–120 Pa. obtained by method which does not require priori knowledge particle charge, but uses charge gradient determined from same experiment. depends only two experimentally quantities: drift velocity and electric field. comparison experimental results with theoretical models presented discussed.
The formation and dissipation of an externally excited planar dust acoustic shock wave in a three-dimensional uniform cloud has been observed under microgravity conditions. experiment performed the dc gas discharge chamber 'Plasma Kristall-4' (Fortov et al 2005 Plasma Phys. Control. Fusion 47 B537) on board A300 Zero-G airplane. Mach number compression factor reached 3.5 6, correspondingly, with width about interparticle distance. Due to utilization polarity-switching mode application...
The influence of a dust cloud on the structure positive column direct current gas discharge in cylindrical glass tube under milligravity conditions has been studied both experimentally and numerically. was produced neon at 60 Pa with diameter 30 mm 1 mA. Spherical monodisperse melamine formaldehyde particles 6.86 μm were injected into formed there uniform maximum 14.4 mm. shape particle number density measured. stationary radial direction slowly drifted axial direction. It found that...
Structural and dynamical properties of a bilayer binary strongly coupled dusty plasma system in sheath an rf discharge are experimentally investigated. Microparticles two different sizes aligned into vertical pairs due to ion focusing (plasma wakes) downstream from the upper particles flow toward bottom electrode. The ordered 2D hexagonal crystalline structure. collective mode dispersion relations measured analyzed. Splitting modes lattice is observed theoretically described. relative...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> 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 produced glass tube with length 35 cm and diameter 3 cm. In addition, RF can be applied by external coils. setup especially suited for studying liquid phase plasmas, e.g., flow phenomena such as turbulence or nozzles, forces...
An attraction between negatively charged micron-sized plastic particles was observed in the bulk of a low-pressure gas-discharge plasma under microgravity conditions. This had led to formation boundary-free dust cluster, containing one big central particle with radius about $6\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ and 30 $1\text{ }\ensuremath{\mu}\mathrm{m}$-sized situated on sphere $190\text{ center. The stability this cluster possible due its confinement by flux particle.
Experimental investigations of the formation elongated dust clouds and their influence on plasma glow intensity uniform direct current (DC) positive column (PC) have been performed under microgravity conditions. For axial stabilization cloud position a polarity switching DC gas discharge with frequency 250 Hz was used. During experiment, spontaneous division one into two smaller steady state has observed. Quantitative data shape, size number density distribution were obtained. Axial radial...
The low-pressure (40 and 90 Pa) low-current (4 10 mA) direct current discharge in a tube with sharp change of its radius is studied both numerically experimentally. A fully self-consistent hybrid numerical model two-dimensional non-uniform positive column neon developed using nonlocal approach. combines kinetic simulation the electrons (under two-terms approach) fluid description ions permits to calculate distribution all plasma parameters discharges cameras cylindrical geometry...