2019 жыл

Мақаланың атауы Авторлары Жылы Журнал атауы Қысқаша аннотация
1 Quantum hydrodynamics for plasmas - Quo vadis ? Bonitz, M., Moldabekov, Z.A., Ramazanov, T.S. 2019 Physics of Plasmas, Open access, Volume 26,  Issue 911, September 2019, Article number 090601, Q2.
Quantum plasmas are an important topic in astrophysics and high pressure laboratory physics for more than 50 years. In addition, many condensed matter systems, including the electron gas in metals, metallic nanoparticles, or electron-hole systems in semiconductors and heterostructures, exhibit - to some extent - plasmalike behavior. Among the key theoretical approaches that have been applied to these systems are quantum kinetic theory, Green function theory, quantum Monte Carlo, semiclassical and quantum molecular dynamics, and more recently, density functional theory simulations. These activities are in close contact with the experiments and have firmly established themselves in the fields of plasma physics, astrophysics, and condensed matter physics. About two decades ago, a second branch of quantum plasma theory emerged that is based on a quantum fluid description and has attracted a substantial number of researchers. The focus of these studies has been on collective oscillations and linear and nonlinear waves in quantum plasmas. Even though these papers pretend to address the same physical systems as the more traditional papers mentioned above, the former appear to form a rather closed community that is largely isolated from the rest of the field. The quantum hydrodynamics (QHD) results have - with a few exceptions - not found application in astrophysics or in experiments in condensed matter physics. Moreover, these results practically did not have any impact on the former quantum plasma theory community. One reason is the unknown accuracy of the QHD for dense plasmas. In this paper, we present a novel derivation, starting from reduced density operators that clearly point to the deficiencies of QHD, and we outline possible improvements. It is also to be noted that some of the QHD results have attracted negative attention being criticized as unphysical. Examples include the prediction of "novel attractive forces" between protons in an equilibrium quantum plasma, the notion of "spinning quantum plasmas," or the new field of "quantum dusty plasmas." In the present article, we discuss the latter system in some detail because it is a particularly disturbing case of formal theoretical investigations that are detached from physical reality despite bold and unproven claims of importance for, e.g., dense astrophysical plasmas or microelectronics. We stress that these deficiencies are not a problem of QHD itself, which is a powerful and efficient method, but rather are due to ignorance of its properties and limitations. We analyze the common flaws of these works and come up with suggestions to improve the situation of QHD applications to quantum plasmas. 
2 Theoretical studies of lithium–aluminum amid and ammonium as perspective hydrogen storage Schur, D.V., Veziroglu, A., Zaginaychenko, S.Y., Matysina, Z.A., Veziroglu, T.N., Gabdullin, M.T., Ramazanov, T.S., Zolonarenko, A.D., Zolonarenko, A.D. 2019 International Journal of Hydrogen Energy, Volume 44, Issue 45, Pages 24810 - 24820, September 20, 2019. Q1.
A statistical theory of the phase transformation of lithium-aluminum amide with the release of ammonia has been developed. The free energies values of the phases were calculated, and their dependences on temperature, pressure, hydrogen concentration, and energy parameters were established. Phase diagram is built. The equations of the thermodynamic equilibrium state are calculated. The isoprocesses in the phases are investigated. The coefficients of squareness and uniformity of isotherms are obtained. The feature of the hydrogen concentration on temperature dependence in the phases has been established. 
3 Study of a Transportation Process of Dust Particles in the Plasma of Radio Frequency Discharge Batryshev, D., Yerlanuly, Y., Gabdullin, M., Ramazanov, T 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 8, Pages 4209 - 4212, August 2019,  Article number 8760577, Q2.
This paper presents the results of studies of dust formations in a radio frequency (RF) discharge plasma. In particular, the behavior of dust clouds in various types of traps was investigated. The experiments were carried out in argon plasma with the following discharge parameters: gas pressure of 0.02-0.6 Torr and discharge power of 1-50 W. Two types of the ring were used as a trap - 'closed' and 'nonclosed.' It was found that by changing the discharge parameters and using a different type of trap, it is possible to control the capture region of dust formations, and therefore, manipulate the extraction of dust particles by mass (size, in the case of monodispersity of particles). It has been observed that at a lower gas pressure the dust cloud is less affected by the traps; moreover, the wider the edge opening of 'nonclosed' ring trap, the more efficient the process of extracting dust particles. The results of this paper can be useful for practical application in the processes of separation and extraction of dust particles from a plasma crystal, the study of particle interactions, and the manipulation of individual particles, etc.
4 Transport control of dust particles by pulse-time modulated RF in dusty plasmas Lin, J., Hashimoto, K., Togashi, R., Utegenov, A., Hénault, M., Takahashi, K., Boufendi, L., Ramazanov, T. 2019 Journal of Applied Physics, Volume 126, Issue 4, July 28, 2019, Article number 043302, Q1
Transport of dust particles was studied in radio frequency (RF) plasmas. Dust particles of two sizes were injected in the plasmas. The plasmas were generated by applying a pulse-time modulated RF voltage. The pulse-time modulation made it possible to change the electron temperature in the plasmas. The electron temperature dominates the charges of the dust particles and the electric fields around the sheath where the dust particles are levitated. The equilibrium position of the dust particles can be determined by forces on them derived from the charges and the electric fields. In this research, it was clearly shown to change the position of the dust particles and drop them from the plasmas by the pulsed-time modulation. Furthermore, the modulated RF plasma worked as sieves of the dust particles. It was possible to drop larger dust particles from the plasma, while smaller ones remain in the plasmas. 
5 Experimental Investigation of the Properties of Plasma-Dust Formations on Pulsed Plasma Accelerator Dosbolayev, M., Raiymkhanov, Z., Tazhen, A., Ramazanov, T. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3047 - 3051, June 2019, Article number 8736991, Q2.
In this paper, we present the results of experimental investigation of the properties of dusty plasma formed in a pulsed plasma accelerator (IPU-30) through the interaction of pulsed plasma beams with a carbon-based target. In the experiments, the interaction of beams of the pulsed plasma with the surface of the carbon plates affords instantaneous heating of the target substrate and subsequent ejection of dust particles from the surface of the plates into the plasma bulk. These dust particles are dragged by the plasma beam creating a moving plasma-dust cloud. A high-speed camera (Phantom VEO710S) is used to obtain the velocity of the dust particles in a beam of the pulsed plasma. Ejection of dust particles is investigated at two different values of the discharge voltage (7 and 12 kV).
6 Neutral Shadowing Force Effect on Structural Properties and Oscillations of Dust Particles in Cryogenic Environment Aldakulov, Y., Muratov, M., Ramazanov, T.S., Moldabekov, Z.A. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3063 - 3068, June 2019, Article number 8733092, Q2
Recently, it was shown that the neutral shadowing interaction can be significantly stronger in the cryogenic complex plasma than in the plasma with neutrals at room temperature. Here, we present the results of the investigation-by molecular dynamics (MD) simulations-of the impact of the neutral shadowing interaction on the radial pair distribution function and the velocity autocorrelation function (VAF) of the charged dust particles in a 2-D layer. The spectrum of VAF was computed to estimate the influence of the neutral shadowing force on the oscillations of dust particles. We found that the neutral shadowing interaction can significantly affect the structural properties and the characteristic longitudinal oscillation frequency of dust particles if the characteristic radius of the neutral shadowing interaction exceeds a mean interdust particle distance. The latter case corresponds to low pressures, p < 1 Pa, and cryogenic temperatures less than 10 K. In addition, the dust acoustic wave taking into account that the neutral shadowing force was derived. It is found that the neutral shadowing force leads to the increase of the sound speed of the dust acoustic wave.
7 Rotation of Dust Structures in a Magnetic Field in a DC Glow Discharge Abdirakhmanov, A.R., Moldabekov, Z.A., Kodanova, S.K., Dosbolayev, M.K., Ramazanov, T.S. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3036 - 3040, June 2019,  Article number 8688665, Q2.
We present the experimental results on influence of an external magnetic field on the dust particles which were suspended in the strata of a glow discharge, where the magnetic field was created using a Helmholtz coil. Observations were made in the strata that located between the coils, under the coil, and above the coil. We observed an interesting behavior of dust particles, which was not previously reported. It was revealed that the dust structure rotates clockwise above the coil and counterclockwise under the coil, while the dust structure located between the coils does not rotate. Experiments were performed with both mono-and poly-disperse dust particles at B ≤ 28 mT. The radial distribution of the angular velocity of dust particles, at the induction of the magnetic field 8, 13, and 19 mT, in different regions was measured. For explanation of the experimental results, we developed a simple theoretical model which shows that the direction of the rotation is determined by the radial component of the magnetic field induction.
8 Influence of Gas Temperature on Nucleation and Growth of Dust Nanoparticles in RF Plasma Orazbayev, S.A., Henault, M., Ramazanov, T.S., Boufendi, L., Batryshev, D.G., Gabdullin, M.T. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3069 - 3073, June 2019,  Article number 8708962, Q2.
The aim of this work is to study the influence of gas temperature on the nucleation and growth mechanism of nanoparticles in order to deeper understand the growth process of carbonaceous nanoparticles in the plasma of a capacitively coupled radio frequency (RF) discharge. For this purpose, a method based on the time evolution of the self-bias voltage amplitude Vdc was used. The obtained results show that the synthesis (nucleation and growth) time of nanoparticles depends on plasma parameters: RF power and gas temperature. It was found that with an increase in the gas temperature from 25 °C (room temperature) up to 100 °C, the nucleation time increases by four times and with a decrease in the temperature from 25 °C to-20 °C, the nucleation requires half the time. The obtained experimental data and calculations, based on the orbital motion limited theory, give an opportunity to predict the values of nanoparticle diameter and concentration in the plasma-enhanced chemical vapor deposition (PECVD) process in a wide range of gas temperature. These results are important for practical applications of nanoparticle growth control in PECVD processes.
9 Simulation of Dynamic Characteristics of Beryllium, Carbon, and Tungsten Dust in the Edge Fusion Plasma Bastykova, N.K., Kodanova, S.K., Ramazanov, T.S., Issanova, A.K., Maiorov, S.A. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3041 - 3043, June 2019,  Article number 8727747, Q2.
In this paper, the dynamics and lifetime of beryllium, carbon, and tungsten dust particles formed on the edge of fusion plasma are considered. To describe the dynamics of the dust particle, the equations of motion, the equations of mass and energy balance, and the equations for the dust particle charge are solved. Calculations take into account the parameters describing the material functions, such as molar enthalpy, saturated vapor pressure, complex phenomena in the dust interaction with plasma leading to mass loss, and properties of electron emission and radiation. Calculations of the charging and the lifetime of Be, C, and W dust particles in the presence of the magnetic field are analyzed. Equilibrium temperatures of Be, C, and W dust particles for typical edge fusion plasma parameters are obtained. It is found that the maximum effect of the magnetic field on the charge and on the dust lifetime is for tungsten dust in comparison with other considered dust materials.
10 Charging of a Dust Particle in a Magnetized Gas Discharge Plasma Kodanova, S.K., Bastykova, N.K., Ramazanov, T.S., Nigmetova, G.N., Maiorov, S.A., Moldabekov, Z.A. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3052 - 3056, June 2019, Article number 8723131, Q2.
The effect of an external magnetic field on the dust particle charging in gas discharge plasmas has been studied using the particle-in-cell and Monte Carlo methods at 1, 2, and 4 T. This paper presents the results for the dust particle charge and the characteristic dust particle charging time for different values of the magnetic field induction. Our simulations have shown that the external magnetic field reduces the absolute value of the dust particle charge and extends the characteristic charging time. In addition, the number density of electrons and ions decreases in the vicinity of the dust particle due to the magnetic force, which we interpret as the action of the external magnetic field hampering plasma flow to the surface of the charged dust particle. To visualize this effect, we show the trajectories of the electrons and ions around the dust particle at different values of the magnetic field induction.
11 Investigation of Synthesis of Carbon Nanowalls by the Chemical Vapor Deposition Method in the Plasma of a Radio Frequency Capacitive Discharge Batryshev, D., Yerlanuly, Y., Ramazanov, T., Gabdullin, M 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 7, Pages 3044 - 3046, June 2019, Article number 8667883, Q2.
In this paper, the synthesis of carbon nanowalls (CNWs) by the chemical vapor deposition method in the plasma of a radio frequency (RF) capacitive discharge is considered. The so-called 'CNWs' are one of the allotropes of carbon, which are interesting from both the practical and theoretical points of view. Because of their large surface, CNWs are a perfect electrode material for electronic devices. CNWs were synthesized at relatively low values of RF power, and it was found that an increase in the discharge power caused a decrease in the height of CNWs and an increase in their thickness. The study of graphitization of the CNW structure showed that synthesized CNWs had a low number of defects in the structure. The obtained results could be useful for the low-cost production of CNWs by the plasma-enhanced chemical vapor deposition (PECVD) method.
12 Dynamical structure factor of strongly coupled ions in a dense quantum plasma Moldabekov, Z.A., Kählert, H., Dornheim, T., Groth, S., Bonitz, M., Ramazanov, T.S 2019 Physical Review E, Open access, Volume 99,  Issue 5, May 10, 2019, Article number 053203,Q1.
The dynamical structure factor (DSF) of strongly coupled ions in dense plasmas with partially and strongly degenerate electrons is investigated. The main focus is on the impact of electronic correlations (nonideality) on the ionic DSF. The latter is computed by carrying out molecular dynamics (MD) simulations with a screened ion-ion interaction potential. The electronic screening is taken into account by invoking the Singwi-Tosi-Land-Sjölander approximation, and it is compared to the MD simulation data obtained considering the electronic screening in the random phase approximation and using the Yukawa potential. We find that electronic correlations lead to lower values of the ion-acoustic mode frequencies and to an extension of the applicability limit with respect to the wave-number of a hydrodynamic description. Moreover, we show that even in the limit of weak electronic coupling, electronic correlations have a nonnegligible impact on the ionic longitudinal sound speed. Additionally, the applicability of the Yukawa potential with an adjustable screening parameter is discussed, which will be of interest, e.g., for the interpretation of experimental results for the ionic DSF of dense plasmas. 
13 Obtaining of superhydrophobic surface in RF capacitively coupled discharge in AR/CH4  Orazbayev, S., Gabdullin, M., Ramazanov, T., Dosbolayev, M., Omirbekov, D., Yerlanuly, Y 2019 Applied Surface Science, Volume 472, Pages 127 - 134, April 1, 2019, Q1.
The aim of this work was to obtain superhydrophobic surfaces in a plasma medium. The experiment was carried out using the Plasma-Enhanced Chemical Vapor Deposition (PECVD) method in two different modes: constant and pulsing. The surface roughness was obtained by applying nanoparticles synthesized in a plasma in a mixture of argon and methane. The resulting particles were deposited on the surface of silicon and glass materials. The dependence of the contact angle on the nanoparticle application cycle on the surface was obtained. The contact angle increased linearly depending on the number of cycles, until it reached 160° at 150–160th cycles, after that the increase in cycles does not affect the contact angle, since the saturation process is in progress. Also the effect of the working gas composition on the hydrophobicity of the surface was studied. At low concentrations of methane (1%) only particles are synthesized in the working gas, and hydrophobicity is unstable, with an increase in methane concentration (7%) nanofilms are synthesized from nanoclusters, and surface hydrophobicity is relatively stable. In addition, a pulsing plasma mode was used to obtain superhydrophobic surfaces. A nanofilm consisting of nanoclusters with a diameter of 4–10 nm was synthesized. The hydrophobicity of the sample showed that the strength of the nanofilm was stable in comparison with the sample obtained in the first mode, but the contact angle was lower. The obtained samples were examined using SEM, SPM, optical analysis, and their contact angles were determined. The experiment was carried out at various plasma parameters. It was found that when a superhydrophobic surface is treated with a buffer plasma (argon), it becomes superhydrophilic.
14 Self-diffusion in two-dimensional quasimagnetized rotating dusty plasmas Hartmann, P., Reyes, J.C., Kostadinova, E.G., Matthews, L.S., Hyde, T.W., Masheyeva, R.U., Dzhumagulova, K.N., Ramazanov, T.S., Ott, T., Kählert, H., Bonitz, M., Korolov, I., Donkó, Z. 2019 Physical Review E, Open access, Volume 99,  Issue 110, January 2019, Article number 013203, Q1.
The self-diffusion phenomenon in a two-dimensional dusty plasma at extremely strong (effective) magnetic fields is studied experimentally and by means of molecular dynamics simulations. In the experiment the high magnetic field is introduced by rotating the particle cloud and observing the particle trajectories in a corotating frame, which allows reaching effective magnetic fields up to 3000 T. The experimental results confirm the predictions of the simulations: (i) superdiffusive behavior is found at intermediate timescales and (ii) the dependence of the self-diffusion coefficient on the magnetic field is well reproduced. 
15 Dust Particle Synthesis by the Combined Plasma Source at Atmospheric Pressure Ussenov, Y.A., Pazyl, A.S., Dosbolayev, M.K., Gabdullin, M.T., Daniyarov, T.T., Muratov, M.M., Ramazanov, T.S. 2019 IEEE Transactions on Plasma Science, Volume 47, Issue 8, Pages 4159 - 4164, 2019, Article number 8778789, Q2.
In this work, the results of experiments on the dust particle synthesis process by combining two types of discharges at atmospheric pressure are presented. The experimental setup consists of two pin type copper electrodes connected to the pulsed high voltage source (spark discharge) and two copper foils wrapped around a quartz tube powered by a kilohertz high voltage sinusoidal signal [atmospheric pressure plasma jet (APP jet)]. In that case, the spark discharge serves as a precursor. It is a source of vapor and primary nanoparticles. Furthermore, these nanoparticles transported by gas flow to the region of uniform dielectric barrier discharge of the plasma jet increased in size and settled on the surface of the substrate. The results of experiments with combined discharge and with spark discharge only are compared. Particle formation and growth mechanisms were discussed. The chemical composition of the deposited particles was obtained.
16 The vector potential of a point magnetic dipole Sautbekov, S. 2019 Journal of Magnetism and Magnetic Materials, Open access, Volume 484, Pages 403 - 407, August 15, 2019, Q1.
The retarded vector potential of a point magnetic dipole possessing an arbitrary time dependence and undergoing an accelerated relativistic motion is derived. A novel expression for the angular distribution of the radiated power of an arbitrarily moving magnetic dipole is obtained. In particular, the case of an uniformly accelerated particle with a constant magnetic moment is considered. The resulting equations are verified by showing that the fields reduce to less general forms found in the literature.
17 Plasma-grain interaction mediated by streaming non-Maxwellian ions Sundar S., Moldabekov Z.A. 2019 Physical Review E, Open access, Volume 99,  Issue 6, June 10, 2019, Article number 063202, Q1.
A comprehensive parametric study of plasma-grain interaction for non-Maxwellian streaming ions in steady-state employing particle-in-cell simulations is delineated. Instead of considering the intergrain interaction potential to be the linear sum of isolated grain potentials, we incorporate the numerical advancement developed fully for grain shielding by including nonlinear contributions from the plasma and shadowing effect. The forces acting on grains versus intergrain distance, streaming velocity of the ions, and impact of trapped ions density (number) are characterized for non-Maxwellian ions in the presence of charge-exchange collisions. It is found that the nonlinear plasma response considerably modifies the plasma-grain interaction. Unlike the stationary plasma case, for two identical grains separated by a distance in the presence of streaming ions, the electrostatic force is neither repulsive for all grain separations nor equivalent to the force due to one isolated grain. Inadequacy of the linear response formalism in dealing with the systems having very large grain charges is also discussed. The smallest intergrain separation for which the role of the shadow effect can be ignored is reported.
18 On the Dust Structures and Chain Reactions Induced over the Regolith by Gyrotron Radiation Skvortsova, N.N., Maiorov, S.A., Malakhov, D.V., Stepakhin, V.D., Obraztsova, E.A., Kenzhebekova, A.I., Shishilov, O.N. 2019 JETP Letters, Volume 109, Issue 7, Pages 441 - 448, April 1, 2019, Q2.
Dust structures formed in exothermic chain plasma chemical processes initiated by pulsed gyrotron radiation in mixtures of metal and dielectric powders are studied. The composition of the powder mixture corresponds to the composition of the lunar regolith. Experiments at the energy of the gyrotron microwave pulse of 1–3 kJ and a pulse duration of 1.5–4 ms reveal an explosive process caused by the Coulomb repulsion of charged particles from the surface of the regolith into the reactor volume. The explosion is followed by the development of chain self-propagating high-temperature synthesis reactions. During these reactions lasting for tens of seconds, the suspension of dust particles rises tens of centimeters above the powder surface. The energy release is more than two orders of magnitude higher than the energy of initiation of a chain reaction. Regolith spheroids with diameters from 1 to 1000 µm precipitate on the side surfaces of the reactor. An analogy of the possible contribution of the Coulomb repulsion between charged particles and plasma exothermic processes to the dispersion of regolith dust when the Moon surface is bombarded by micrometeorites is considered.
19 Stopping power of an electron gas: The sum rule approach Arkhipov, Y.V., Ashikbayeva, A.B., Askaruly, A., Dubovtsev, D.Y., Syzganbayeva, S.A., Tkachenko, I.M. 2019 Contributions to Plasma Physics 59(3):e201800171 June 2019, Q2. DOI:10.1002/ctpp.201800171 The stopping power of dense electron plasmas is determined using a simplified version of the method of moments based on some interpolation formulas for the sum rules of the loss function. The energy losses of ions are evaluated with various projectile charges moving in a plasma at different values of the coupling and degeneracy parameters. The losses of slowly moving charged particles are closely examined. The results obtained are compared with those of some alternative approaches and the particle‐in‐cell (PIC) simulation data.