scholarly journals Potential distribution around a charged dust grain in an electronegative plasma

2010 ◽  
Vol 76 (5) ◽  
pp. 673-676 ◽  
Author(s):  
P. K. SHUKLA ◽  
L. STENFLO
Keyword(s):  
Potential Distribution ◽  
Negative Ions ◽  
Plasma Sheath ◽  
Dust Particles ◽  
Charged Dust ◽  
Electronegative Plasma ◽  
Positive Ions ◽  
Dust Grain ◽  
Bulk Plasma

AbstractThe potential distribution around a charged dust grain in an electronegative plasma is obtained by using the appropriate dielectric susceptibilities for the Boltzmann distributed electrons and negative ions, and for the inertial positive ions that are streaming from the bulk plasma into the electronegative plasma sheath. The existence of oscillatory ion wakefields is shown. Positive ions are trapped/focused in the ion wakefields, and subsequently the negative dust particles are attracted to each other, forming ordered dust structures.

scholarly journals Drift wave excitation in a collisional dusty magnetoplasma with multi-ion species

2009 ◽  
Vol 75 (2) ◽  
pp. 153-158 ◽  
Author(s):  
P. K. SHUKLA ◽  
M. ROSENBERG
Keyword(s):  
Negative Ions ◽  
Magnetized Plasma ◽  
Dust Particles ◽  
Charged Dust ◽  
Dust Grains ◽  
Wave Excitation ◽  
Drift Wave ◽  
Positive Ions ◽  
Dissipative Instability ◽  
Ion Species

AbstractWe investigate the drift dissipative instability in a non-uniform magnetized plasma composed of electrons, positive ions, negative ions and negatively charged dust particles. We use a multi-fluid plasma model and derive a dispersion relation for the electrostatic drift waves with frequencies much smaller than the ion gyrofrequencies and wavelengths longer than the ion gyroradii. The presence of the negatively charged, massive dust grains affects the drift wave frequency and the growth rate of the drift dissipative instability. The present results may be relevant to space and laboratory magnetoplasmas containing negative ions and charged dust grains.

Soliton turbulence in electronegative plasma due to head-on collision of multi solitons

2020 ◽  
Vol 75 (12) ◽  
pp. 999-1007
Author(s):  
Rustam Ali ◽  
Anjali Sharma ◽  
Prasanta Chatterjee
Keyword(s):  
Wave Field ◽  
Soliton Solutions ◽  
Negative Ions ◽  
First Integral ◽  
Statistical Properties ◽  
Charged Dust ◽  
Bilinear Method ◽  
Electronegative Plasma ◽  
Kdv Equations ◽  
First Four Moments

AbstractHead-on interaction of four dust ion acoustic (DIA) solitons and the statistical properties of the wave field due to head-on interaction of solitons moving in opposite direction is studied in the framework of two Korteweg de Vries (KdV) equations. The extended Poincaré–Lighthill–Kuo (PLK) method is applied to obtain two opposite moving KdV equations from an unmagnetized four component plasma model consisting of Maxwellian negative ions, cold mobile positive ions, κ-distributed electrons and positively charged dust grains. Hirota’s bilinear method is adopted to obtain two-soliton solutions of both the KdV equations and accordingly act of soliton turbulence is presented due to head-on collision of four solitons. The amplitude and shape of the resultant wave profile at the point of strongest interaction are obtained. To see the effect of head-on collision on the statistical properties of wave field the first four moments are computed. It is observed that the head-on collision has no effect on the first integral moment while the second, third and fourth moments increase in the dominant interaction region of four solitons, which is a clean indication of soliton turbulence.

Solitary waves in a dusty adiabatic electronegative plasma

2010 ◽  
Vol 76 (3-4) ◽  
pp. 409-418 ◽  
Author(s):  
A. A. MAMUN ◽  
K. S. ASHRAFI ◽  
M. G. M. ANOWAR
Keyword(s):  
Solitary Waves ◽  
Vries Equation ◽  
Negative Ions ◽  
Finite Amplitude ◽  
Reductive Perturbation Method ◽  
Charged Dust ◽  
Electronegative Plasma ◽  
Ion Acoustic ◽  
Basic Features ◽  
Electronegative Plasmas

AbstractThe dust ion-acoustic solitary waves (SWs) in an unmagnetized dusty adiabatic electronegative plasma containing inertialess adiabatic electrons, inertial single charged adiabatic positive and negative ions, and stationary arbitrarily (positively and negatively) charged dust have been theoretically studied. The reductive perturbation method has been employed to derive the Korteweg-de Vries equation which admits an SW solution. The combined effects of the adiabaticity of plasma particles, inertia of positive or negative ions, and presence of positively or negatively charged dust, which are found to significantly modify the basic features of small but finite-amplitude dust-ion-acoustic SWs, are explicitly examined. The implications of our results in space and laboratory dusty electronegative plasmas are briefly discussed.

The Effective Temperature of Dust Impact Plasmas — Olivine Dust on Tungsten Target

2021 ◽  
Author(s):  
Jiří Pavlů ◽  
Samuel Kočiščák ◽  
Åshild Fredriksen ◽  
Michael DeLuca ◽  
Zoltan Sternovsky
Keyword(s):  
Negative Charge ◽  
Negative Ions ◽  
Charge Carriers ◽  
Dust Particles ◽  
Applied Bias ◽  
Control Grid ◽  
Impact Speed ◽  
Positive Ions ◽  
Effective Temperatures ◽  
The Impact

<p>We experimentally observe both positive and negative charge carriers in impact plasma and estimate their effective temperatures. The measurements are carried on a dust accelerator using polypyrrole (PPy)-coated olivine dust particles impacting tungsten (W) target in the velocity range of 2–18 km/s. We measure the retained impact charge as a function of applied bias potential to the control grid. The temperatures are estimated from the data fit. The estimated effective temperatures of the positive ions are approximately 7 eV and seems to be independent of the impact speed. The negative charge carriers' temperatures vary from as low as 1 eV for the lowest speeds to almost ten times higher speeds. The presented values differ significantly from previous studies using Fe dust particles. Yet, the discrepancy can be attributed to a larger fraction of negative ions in the impact plasma that likely originates from the PPy coating.</p>

THE IONIZATION OF THE ATMOSPHERE MEASURED FROM FLYING AIRCRAFT

1931 ◽  
Vol 5 (6) ◽  
pp. 625-635
Author(s):  
D. C. Rose
Keyword(s):  
Relative Humidity ◽  
Negative Ions ◽  
Ground Level ◽  
The State ◽  
Dust Particles ◽  
Measuring Apparatus ◽  
Positive Ions ◽  
Humidity Measurements ◽  
Water Drops ◽  
Atmospheric Ionization

The Gerdian type of atmospheric ionization measuring apparatus was attached to a cabin aeroplane so that the state of ionization of the atmosphere could be studied. The limitations of the apparatus for aeroplane use are discussed. Measurements were taken from ground level to heights of 15000 ft. The results are plotted in number of ions per cc. (separate curves for positive and negative) at different altitudes.The results indicate that at the cloud level there is an abnormal excess of small positive ions and a minimum in the excess of positive ions over negative ions from 4000–6000 ft. higher. This does not include large ions such as charged water drops or dust particles. The observations were taken in regions free from clouds, the cloud level being determined by observation on clouds in the sky, and by relative humidity measurements taken at the same time.

Current-driven drift wave instability in a collisional dusty negative ion plasma

2013 ◽  
Vol 79 (6) ◽  
pp. 1113-1116 ◽  
Author(s):  
M. ROSENBERG
Keyword(s):  
Negative Ions ◽  
Negative Ion ◽  
Drift Waves ◽  
Charged Dust ◽  
Wave Instability ◽  
Nonuniform Plasma ◽  
Positive Ions ◽  
Ion Plasma ◽  
The Magnetic Field ◽  
Linear Kinetic Theory

AbstractThe excitation of drift waves by an electron current parallel to the magnetic field is investigated in a nonuniform plasma composed of electrons, positive ions, negative ions, and massive, negatively charged dust. Electrostatic drift waves with frequencies smaller than the ion gyrofrequencies and wavelengths larger than the ion gyroradii are considered. Linear kinetic theory is used, and collisions of charged particles with neutrals are taken into account. The present results may be relevant to laboratory collisional magnetoplasmas containing negative ions and dust.

Plasma sheath evolution from perturbed electrodes in a negative-ion plasma. Part 2. Experiment and PIC simulation

1997 ◽  
Vol 58 (3) ◽  
pp. 455-466 ◽  
Author(s):  
SEUNGJUN YI ◽  
YASSER EL-ZEIN ◽  
KARL E. LONNGREN ◽  
TERENCE E. SHERIDAN
Keyword(s):  
Fluid Model ◽  
Negative Ions ◽  
Plasma Sheath ◽  
Negative Ion ◽  
Pic Simulation ◽  
Particle In Cell ◽  
Model Code ◽  
Positive Ions ◽  
Ion Plasma ◽  
Quasineutral Plasma

The two-dimensional spatial and temporal evolution of a plasma surrounding an electrode whose potential is suddenly decreased is experimentally investigated. The electrode contains a localized convex or a localized concave perturbation. The quasineutral plasma consists of positive ions and various proportions of negative ions and electrons. The results are compared and contrasted with those that are obtained numerically using a particle-in-cell (PIC) simulation and those that had previously been obtained using a fluid-model code.

The optimum shielding around a test charge in plasmas containing two negative ions

2011 ◽  
Vol 77 (5) ◽  
pp. 663-673 ◽  
Author(s):  
W. M. MOSLEM ◽  
R. SABRY ◽  
P. K. SHUKLA
Keyword(s):  
Acoustic Waves ◽  
Potential Distribution ◽  
Negative Ions ◽  
New Materials ◽  
Oscillatory Potential ◽  
Charge Particle ◽  
Ion Acoustic Waves ◽  
Positive Ions ◽  
Test Charge ◽  
Ion Acoustic

AbstractThis paper focuses on the progress in understanding the shielding around a test charge in the presence of ion-acoustic waves in multispecies plasmas, whose constituents are positive ions, two negative ions, and Boltzmann distributed electrons. By solving the linearized Vlasov equation with Poisson equation, the Debye–Hückel screening potential and wakefield (oscillatory) potential distribution around a test charge particle are derived. It is analytically found that both the Debye–Hückel potential and the wakefield potential are significantly modified due to the presence of two negative ions. The present results might be helpful to understand and to form new materials from plasmas containing two negative ions such as Xe+ − F− − SF−6 and Ar+ − F− − SF−6 plasmas, as well as to tackle extension of the test charge problem in multinegative ions' coagulation/agglomeration.

Dust-ion-acoustic nonlinear waves in a dusty electronegative plasma with vortex-like negative ions

2012 ◽  
Vol 79 (2) ◽  
pp. 233-238 ◽  
Author(s):  
N. ROY ◽  
S. S. DUHA ◽  
A. A. MAMUN
Keyword(s):  
Nonlinear Waves ◽  
Negative Ions ◽  
Reductive Perturbation Method ◽  
Charge Fluctuation ◽  
Ion Dynamics ◽  
Electronegative Plasma ◽  
Dust Charge ◽  
Positive Ions ◽  
Basic Features ◽  
Positive Ion

AbstractThe basic features of the nonlinear waves, which are associated with positive ion dynamics and dust charge fluctuation, have been investigated by employing the reductive perturbation method in a dusty electronegative plasma containing Boltzmann electrons, vortex-like negative ions, mobile positive ions, and charge fluctuating stationary dust (negatively charged). It has been observed that the basic features of the nonlinear waves (viz. amplitude, width, speed, etc.) in the plasma system under consideration have been significantly modified by the trapping parameter (introduced for vortex-like distribution of negative ions). The implications of the results (obtained from this investigation) in space and laboratory experiments have been briefly discussed.

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