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  • American Institute of Physics (AIP)  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Mechanism of dust-acoustic instability in a direct current glow discharge plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1374-1380 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An observation of low frequency waves spontaneously excited in a dc glow discharge dusty plasma is reported. To analyze possible reasons for the instability observed, a linear dispersion relation which takes into account collisions with neutrals, dust grain charge variations, ion drift, and forces acting on dust particles is derived. Numerical analysis of the dispersion relation shows that the observed instability is the result of dust charge variations in the presence of external charge-dependent forces together with the ion drift effect. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873954
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    Paper (German National Licenses)
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  • 2
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    On the lower bound of the internal energy of the one-component-plasma (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-04-23
    Description: A new simple yet accurate analytical estimate for the internal energy of the classical one-component-plasma is proposed. In the limit of weak coupling, it reduces to the Debye-Hückel result. In the opposite limit of strong coupling, the ion sphere approximation is recovered. The agreement with the accurate numerical results in the intermediate coupling regime is fairly good.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Simple thermodynamics of strongly coupled one-component-plasma in two and three dimensions (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-10-10
    Description: Simple analytical approximations for the internal energy of the strongly coupled one-component-plasma in two and three dimensions are discussed. As a result, new practical expressions for the internal energy in the fluid phase are proposed. Their accuracy is checked by evaluating the location of the fluid-solid phase transition from the free energy consideration. Possible applications to other related systems are briefly discussed.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Ion sphere model for Yukawa systems (dusty plasmas) (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-12-18
    Description: Application of the ion sphere model (ISM), well known in the context of the one-component-plasma, to estimate thermodynamic properties of model Yukawa systems is discussed. It is shown that the ISM approximation provides fairly good estimate of the internal energy of the strongly coupled Yukawa systems, in both fluid and solid phases. Simple expressions for the excess pressure and isothermal compressibility are derived, which can be particularly useful in connection to wave phenomena in strongly coupled dusty plasmas. It is also shown that in the regime of strong screening a simple consideration of neighboring particles interactions can be sufficient to obtain quite accurate estimates of thermodynamic properties of Yukawa systems.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Collective modes in two-dimensional one-component-plasma with logarithmic interaction (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-05-20
    Description: The collective modes of a familiar two-dimensional one-component-plasma with the repulsive logarithmic interaction between the particles are analysed using the quasi-crystalline approximation (QCA) combined with the molecular dynamic simulation of the equilibrium structural properties. It is found that the dispersion curves in the strongly coupled regime are virtually independent of the coupling strength. Arguments based on the excluded volume consideration for the radial distribution function allow us to derive very simple expressions for the dispersion relations, which show excellent agreement with the exact QCA dispersion over the entire domain of wavelengths. Comparison with the results of the conventional fluid analysis is performed, and the difference is explained.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
    Electronic Resource
    Electronic Resource
    Waves in two component electron-dust plasma (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 2629-2634 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A self-consistent model of linear waves propagating in a two component dusty plasma whose constituents are positively charged dust grains and electrons is presented. Ionization and recombination processes on the dust particle surface, elastic Coulomb collisions of electrons with dust, electron-neutral collisions, dust-electron and dust-neutral collisions, as well as dust charge variations are taken into account. The relationships between the characteristic frequencies of these processes are studied. A linear dispersion relation is obtained and some limiting cases are analyzed. It is shown that Langmuir waves are damped due to electron collisions. It is also found that low frequency waves are always stable in such a system, and there exist two dust-acoustic modes: (1) the usual dust acoustic mode, similar to the ion acoustic wave in electron-ion plasmas; and (2) an acoustic mode with reduced phase velocity, associated with dust particle charge variations. The static response of electron-dust plasmas is examined and the screening length of the system is determined. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1370061
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  • 7
    Electronic Resource
    Electronic Resource
    Dust diffusion across a magnetic field due to random charge fluctuations (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 619-623 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dust particle diffusion across a magnetic field due to random charge fluctuations is reconsidered. Previously it was suggested that this mechanism could be one of the most effective processes which transport particles in the inner Jovian magnetosphere [G. E. Morfill, E. Grün, and T. V. Johnson, Planet Space Sci. 28, 1087 (1980)]. A general expression for the diffusion constant is derived using the stochastic equation of dust particle motion and known properties of random charge fluctuations. The dependence of the diffusion constant on magnetic-field strength and fluctuation amplitude is discussed. Numerical evaluation for conditions typical for the inner Jovian magnetosphere is presented. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1431248
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  • 8
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    Thermodynamics of Yukawa fluids near the one-component-plasma limit (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-08-14
    Description: Thermodynamics of weakly screened (near the one-component-plasma limit) Yukawa fluids in two and three dimensions is analyzed in detail. It is shown that the thermal component of the excess internal energy of these fluids, when expressed in terms of the properly normalized coupling strength, exhibits the scaling pertinent to the corresponding one-component-plasma limit (the scalings differ considerably between the two- and three-dimensional situations). This provides us with a simple and accurate practical tool to estimate thermodynamic properties of weakly screened Yukawa fluids. Particular attention is paid to the two-dimensional fluids, for which several important thermodynamic quantities are calculated to illustrate the application of the approach.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
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    Approximate expression for the electric potential around an absorbing particle in isotropic collisionless plasma (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-05-16
    Description: A new approximate expression for the potential distribution around an absorbing particle in isotropic collisionless plasma is proposed. The approximate expression is given by the sum of the Debye-Hückel potential with an effective screening length and the far-field asymptote obtained from the solution of the linearized Poisson equation. In contrast to analogous models, the effective screening length is not fixed but depends on the distance from the particle. This allows us to obtain a more accurate approximation for the potential distribution in the entire range of distances. The dependence of the screening length on the distance is predicted from the analysis of the charge density distribution function. This dependence contains two adjustable parameters, which are calculated by applying the procedure based on charge balance considerations. Using the obtained results, simple expressions for the parameters of the model are proposed. In addition, a simple expression for the characteristic screening length, which can be used to approximate the potential distribution near the particle, is obtained. The developed model potential is shown to be in excellent agreement with the solution of the nonlinear Poisson equation for typical conditions used in experiments with complex plasmas.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 10
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    Practical thermodynamics of Yukawa systems at strong coupling (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-05-20
    Description: Simple practical approach to estimate thermodynamic properties of strongly coupled Yukawa systems, in both fluid and solid phases, is presented. The accuracy of the approach is tested by extensive comparison with direct computer simulation results (for fluids and solids) and the recently proposed shortest-graph method (for solids). Possible applications to other systems of softly repulsive particles are briefly discussed.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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