Depression and Excitation of Buneman’s Instability in Two Ions Species Magnetized Dusty Plasma

Mapping Intimacies ◽

10.21203/rs.3.rs-115145/v1 ◽

2020 ◽

Author(s):

Haifa Alyoussef

Keyword(s):

Diffusion Equation ◽

Theoretical Method ◽

One Dimension ◽

Thermal Velocity ◽

Dust Grains ◽

Temperature Ratio ◽

Plasma Inhomogeneity ◽

Magnetized Dusty Plasma ◽

Different Temperatures ◽

Ion Species

Abstract In this research, theoretical method was used to examine the excitation and depression state for two-stream Buneman’s instability (BI) when we assumed an inhomogeneous, anisotropic, multi ions species with the presence of dust grains in plasma. The plasma also studied at different temperatures state. The diffusion equation was also derived and solved in one dimension for the Buneman’s instabilities that arise in such a situation within plasma. We develop the single-ion theory into a multiple-ion-species theory. This study concluded that: degree of plasma inhomogeneity, electron to ions temperature ratio, multi ions species and dust grains which have thermal velocity play a very important role in the depression and excitation of instability such Buneman’s instability.

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Numerical study of the sheath in magnetized dusty plasma with two-temperature electrons

Journal of Plasma Physics ◽

10.1017/s0022377814000403 ◽

2014 ◽

Vol 81 (1) ◽

Cited By ~ 4

Author(s):

I. Driouch ◽

H. Chatei ◽

M. El Bojaddaini

Keyword(s):

Dusty Plasma ◽

Numerical Study ◽

Plasma Sheath ◽

Hot Electrons ◽

Dust Grains ◽

Magnetized Dusty Plasma ◽

Positive Ions ◽

Different Temperatures ◽

Dimensionless Variables ◽

Two Temperature

Fluid simulations are used to investigate a multi-component magnetized dusty plasma sheath. The model consists of positive ions, dust grains, and two species of electron populations. These electrons are assumed to be a sum of two Maxwellian distributions with two different temperatures (cold and hot). According to multi-fluid equations and some dimensionless variables, the dimensionless equations are obtained and solved numerically. The effect of the presence of the hot electrons in the sheath is examined. A significant change is observed in the quantities characterizing the sheath with respect to one species electrons (cold) assumption.

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Inward and outward dust acoustic cylindrical and spherical waves interaction in four-component dusty plasma with nonthermal ions

Zeitschrift für Naturforschung A ◽

10.1515/zna-2021-0137 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Uday Narayan Ghosh ◽

Prasanta Chatterjee ◽

Barjinder Kaur

Keyword(s):

Dusty Plasma ◽

Charged Dust ◽

Dust Grains ◽

Mass Ratio ◽

Temperature Ratio ◽

Spherical Waves ◽

Dust Acoustic ◽

Waves Interaction ◽

Positively Charged ◽

Different Time Scales

Abstract A theoretical investigation by an all-inclusive adaptation of the PLK strategy is carried out in order to study the inward and outward interaction between two cylindrical and spherical dust acoustic solitary waves (DASWs) in an unmagnetized dusty plasma consisting of nonthermal distributed ions, negatively and positively charged dust grains along with electrons featuring Boltzmann’s distribution. The interactions and collisions between two cylindrical and spherical geometries at different time scales are studied. Also the combined effects of the nonthermality of ions, ion to electron temperature ratio as well as mass ratio of positive to negative dust grains have been studied in detail on the phase shifts raised due to collision. It has been seen that the properties of the cooperation of DASWs in cylindrical and spherical shaped are distinct.

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Effect of the charged dust grains on the neutral induced low frequency drift instability in a weakly ionized and magnetized dusty plasma

Journal of Atmospheric and Solar-Terrestrial Physics ◽

10.1016/s1364-6826(99)00038-3 ◽

1999 ◽

Vol 61 (10) ◽

pp. 789-794

Author(s):

Lata Iyer ◽

V. Jayaraman ◽

V.H. Kulkarni

Keyword(s):

Dusty Plasma ◽

Low Frequency ◽

Frequency Drift ◽

Charged Dust ◽

Dust Grains ◽

Magnetized Dusty Plasma ◽

Weakly Ionized ◽

Drift Instability

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Effects of dust grain charge fluctuation on an obliquely propagating dust acoustic solitary potential in a magnetized dusty plasma

Journal of Plasma Physics ◽

10.1017/s0022377899008028 ◽

2000 ◽

Vol 63 (2) ◽

pp. 191-200 ◽

Cited By ~ 28

Author(s):

A. A. MAMUN ◽

M. H. A. HASSAN

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Dusty Plasma ◽

Finite Amplitude ◽

Reductive Perturbation Method ◽

Charge Fluctuation ◽

Dust Grains ◽

Magnetized Dusty Plasma ◽

Dust Acoustic ◽

Dust Grain

Effects of dust grain charge fluctuation, obliqueness and external magnetic field on a finite-amplitude dust acoustic solitary potential in a magnetized dusty plasma, consisting of electrons, ions and charge-fluctuating dust grains, are investigated using the reductive perturbation method. It is shown that such a magnetized dusty plasma system may support a dust acoustic solitary potential on a very slow time scale involving the motion of dust grains, whose charge is self- consistently determined by local electron and ion currents. The effects of dust grain charge fluctuation, external magnetic field and obliqueness are found to modify the properties of this dust acoustic solitary potential significantly. The implications of these results for some space and astrophysical dusty plasma systems, especially planetary ring systems and cometary tails, are briefly mentioned.

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Optimization of Longitudinal Rectangular Fins With Asymmetrical Boundary Conditions

2010 14th International Heat Transfer Conference, Volume 2 ◽

10.1115/ihtc14-22670 ◽

2010 ◽

Cited By ~ 1

Author(s):

J. P. Luna-Abad ◽

Francisco Alhama

Keyword(s):

Boundary Conditions ◽

Optimization Problem ◽

Neutral Line ◽

Temperature Ratio ◽

Optimal Thickness ◽

Maximum Heat ◽

Optimal Geometry ◽

Relative Inverse ◽

Network Method ◽

Different Temperatures

Longitudinal rectangular fins with asymmetrical boundary conditions and different temperatures at each base were been studied and optimized using relative inverse thermal admittance as performance coefficient. A Neutral Line was defined and determined for different temperature ratios at the bases. Using the network method for the numerical simulation, the optimization problem was solved in a classical way: starting with the fin volume, heat transfer coefficient and thermal conductivity, the optimal geometry or aspect ratio (length/thickness ratio) for dissipating maximum heat from the fin surface was determined. The results are illustrated through tables and universal graphics made with optimal points, which, are independent from the temperature ratio at the bases. Besides the optimal thickness the graphics also provide, the fin effectiveness and the transversal Biot number. Finally, the location of the Neutral Line is represented for the optimal geometry and temperature ratios. To illustrate the optimization process practical examples are shown.

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Characteristics of high altitude oxygen ion energization and outflow as observed by Cluster: a statistical study

Annales Geophysicae ◽

10.5194/angeo-24-1099-2006 ◽

2006 ◽

Vol 24 (3) ◽

pp. 1099-1112 ◽

Cited By ~ 42

Author(s):

H. Nilsson ◽

M. Waara ◽

S. Arvelius ◽

O. Marghitu ◽

M. Bouhram ◽

...

Keyword(s):

Magnetic Field ◽

High Altitude ◽

Statistical Study ◽

Observation Interval ◽

Bulk Velocity ◽

Thermal Velocity ◽

Oxygen Ion ◽

Wide Range ◽

Parallel Acceleration ◽

Ion Species

Abstract. The results of a statistical study of oxygen ion outflow using Cluster data obtained at high altitude above the polar cap is reported. Moment data for both hydrogen ions (H+) and oxygen ions (O+) from 3 years (2001-2003) of spring orbits (January to May) have been used. The altitudes covered were mainly in the range 5–12 RE geocentric distance. It was found that O+ is significantly transversely energized at high altitudes, indicated both by high perpendicular temperatures for low magnetic field values as well as by a tendency towards higher perpendicular than parallel temperature distributions for the highest observed temperatures. The O+ parallel bulk velocity increases with altitude in particular for the lowest observed altitude intervals. O+ parallel bulk velocities in excess of 60 km s-1 were found mainly at higher altitudes corresponding to magnetic field strengths of less than 100 nT. For the highest observed parallel bulk velocities of O+ the thermal velocity exceeds the bulk velocity, indicating that the beam-like character of the distribution is lost. The parallel bulk velocity of the H+ and O+ was found to typically be close to the same throughout the observation interval when the H+ bulk velocity was calculated for all pitch-angles. When the H+ bulk velocity was calculated for upward moving particles only the H+ parallel bulk velocity was typically higher than that of O+. The parallel bulk velocity is close to the same for a wide range of relative abundance of the two ion species, including when the O+ ions dominates. The thermal velocity of O+ was always well below that of H+. Thus perpendicular energization that is more effective for O+ takes place, but this is not enough to explain the close to similar parallel velocities. Further parallel acceleration must occur. The results presented constrain the models of perpendicular heating and parallel acceleration. In particular centrifugal acceleration of the outflowing ions, which may provide the same parallel velocity increase to the two ion species and a two-stream interaction are discussed in the context of the measurements.

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Some Ionic and Bioelectric Properties of the Ameba Chaos chaos

The Journal of General Physiology ◽

10.1085/jgp.49.1.151 ◽

1965 ◽

Vol 49 (1) ◽

pp. 151-178 ◽

Cited By ~ 53

Author(s):

David L. Bruce ◽

John M. Marshall

Keyword(s):

Active Transport ◽

Electrical Resistance ◽

Contractile Vacuole ◽

Bioelectric Potential ◽

Ionic Regulation ◽

Intracellular Membrane ◽

Intact Cells ◽

Different Temperatures ◽

Active Processes ◽

Ion Species

Ionic relationships in the giant ameba Chaos chaos were studied by analyzing bulk preparations of ground cytoplasm for K, Na, and Cl. Ion levels under normal conditions were compared with the levels in cells exposed to varying concentrations of different ions, for varying times and at different temperatures. By standard intracellular electrode techniques, the bioelectric potential, electrical resistance, and rectifying properties of the plasmalemma were studied on intact cells in media of different composition. The results obtained, when related to evidence from other studies on ion fluxes and osmotic relationships, suggest the following concept of ionic regulation in Chaos chaos. In the absence of active membrane uptake, the plasmalemma is essentially impermeable to anions but permeable to both K and Na, which enter passively. In the cold the cell does not discriminate between K and Na, the cytoplasmic level of K + Na is determined by a Donnan distribution, and osmotic imbalance leads to slow swelling. At normal temperatures active processes are added: Na and water are pumped out by the contractile vacuole system; Cl is accumulated, along with the colloid components of the cytoplasm, only during feeding and growth, which depend upon membrane uptake and intracellular membrane transformations. There is no evidence for active transport of any ion species directly across the plasmalemma.

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Defect Accumulation and Recovery in Ion-Implanted 6H-SiC

MRS Proceedings ◽

10.1557/proc-719-f11.3 ◽

2002 ◽

Vol 719 ◽

Author(s):

W. Jiang ◽

W. J. Weber ◽

C. M. Wangxya

Keyword(s):

Single Crystal ◽

Ion Beam ◽

Irradiation Temperature ◽

Recovery Processes ◽

Defect Accumulation ◽

Different Temperatures ◽

Induced Defects ◽

Ion Species ◽

Irradiation Induced Defects

AbstractSingle crystal wafers of <0001>-oriented 6H-SiC were irradiated at different temperatures using a variety of ion species. The disorder on both the Si and C sublattices has been studied in situ using a combination of ion beam analyses in multiaxial channeling geometry. The fraction of the irradiation-induced defects surviving simultaneous recovery processes decreases with decreasing ion mass and with increasing irradiation temperature. Some of the Si and C defects are well aligned with the <0001> axis and the rate of C disordering is higher than that of Si disordering. Three recovery stages in Au2+-irradiated 6H-SiC have been identified.

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