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Jun 30, 2020Open    AccessArticle

The Alfven Wave Zoo

A. S. de Assis, C. E. da Silva, V. J. O. Werneck de Carvalho
It has been shown that a variety of names are assigned to the original MHD Alfven wave derived originally by Hannes Alfven in the 40s (Nature 150, 405-406 (1942)), and those names are used due to the different magnetic geometries where the target plasma could be confined, that is, in laboratory, in fusion, in space, and in astrophysics, where one could use as working geometry systems such as cartesian, cylindrical, toroidal, dipolar, and even more complex ones. We also show that different names ...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106378


Jul 24, 2018Open    AccessArticle

Synthesis of ZnO Nanoparticles by Using an Atmospheric-Pressure Plasma Jet

Eidan Asi Abdullah, Ahmed Abed Anber, Farqad Fisal Edan, Ali Jabbar Fraih
In this study, zinc oxide nanoparticles were synthesized by using an at-mospheric-pressure plasma jet in NaOH-HNO3 electrolytic system. Atmos-pheric-Pressure Plasma Jet was successfully used as the cathode and Znsheet was used as the anode. The characterization of zinc oxide was obtained by X-ray powder diffraction (XRD), Fourier transformation infra-red (FTIR) and transmission electron micros
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Open Access Library J. Vol.5, 2018
Doi:10.4236/oalib.1104755

Plasma 

Jan 22, 2018Open    AccessArticle

Instability of Dielectric Liquid Surface under the Action of HV Corona Discharge Pulses

Alexander Korolev
Instability of liquid dielectrics surface, being developing after the action of an alternating current corona discharge pulse, has been experimentally investigated. Voltage amplitude on the corona electrode reaches 70 kV, frequency is 17 MHz, and pulse duration is 0.5-1 μs. This is similar to rose-window instability at electrode height above the liquid surface > 5-10 mm. At lesser heights, development of a singular crater is ob
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Open Access Library J. Vol.5, 2018
Doi:10.4236/oalib.1104269


Jan 06, 2017Open    AccessArticle

Study the Addition of Lab-Made Gas Mixing Unit with Varying of Inter-Electrode Distances on the Characterization of DC Magnetron Sputtering System

Bahaa T. Chiad, Firas J. Kadhim, Ahmed A. Anber
In this paper, the effect of lab-made gas mixing unit and inter-electrode distance on, current-voltage characteristics of argon and argon-nitrogen plasma, Paschen’s curve and variation of discharge current with working pressure are presented. The results showed the mixing of nitrogen gas with argon at ratio Ar:N2 of 1:1, an increase in the discharge current was observed, while at ra
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Open Access Library J. Vol.4, 2017
Doi:10.4236/oalib.1103269

Plasma 

Oct 07, 2014Open    AccessArticle

Electron Beam Effects on Kinetic Alfven Waves in the Plasma Sheet Boundary Layer

G. Shrivastava, J. Shrivastava
This work studies the effect of earthward electron beam on kinetic Alfven wave in plasma sheet boundary layer (PSBL). The particle aspect approach is adopted to investigate the trajectories of charged particles in the electromagnetic field of kinetic Alfven wave. Expressions are found for the dispersion relation, growth/damping-rate and associated currents in the presence of electron beam in homogenous plasma. Kinetic effects of electrons and ions are included to study kinetic Alfven wave becaus...
Open Access Library J. Vol.1, 2014
Doi:10.4236/oalib.1100518


Aug 26, 2014Open    AccessArticle

Stronger Self-Focusing of Hermite-Cosh-Gaussian (HChG) Laser Beam in Plasma

Niti Kant, Vikas Nanda

The relativistic self-focusing of HChG beam in the plasma has been investigated theoretically using WKB and paraxial ray approximation for mode indices 0, 1 and 2 for different values of pulse amplitude, normalized plasma density and decentred parameter. The plot between beam width parameter f and the normalized length ξ for different value of normalized density has been reported and indicates the enhancement of the self-focusing phenomena of the laser b

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Open Access Library J. Vol.1, 2014
Doi:10.4236/oalib.1100681


Jul 30, 2014Open    AccessArticle

Negatively Charged Oxygen Ions as a Plasma Diagnostic Tool: Application to Comets

Sreekala Gopinathan, Sijo Sebastian, Noble Abraham, Savithri Devi, Venugopal Chandu, Renuka Gangadharan
We study the stability of the ion-acoustic (IA) wave in a collisional plasma composed of hydrogen, positively and negatively charged oxygen ions, electrons and neutral atoms. This composition approximates very well the plasma environment around a comet. A solution of the dispersion relation yields a frequency for the IA wave at around the hydrogen plasma frequency. The growth/ damping rate is sensitively dependent on the ring parameters u⊥s (the ring speed) an...
Open Access Library J. Vol.1, 2014
Doi:10.4236/oalib.1100570


Jul 23, 2014Open    AccessArticle

Characteristics and Operation Conditions of a Closed-Field Unbalanced Dual Magnetrons Plasma Sputtering System

Bahaa T. Chiad, Mohammad K. Khalaf, Firas J. Kadhim, Oday A. Hammadi

In this work, a home-made closed-field unbalanced magnetron system for plasma sputtering purposes was constructed and operated. The effect of magnetron was introduced by comparing the obtained Paschen’s curve in existence of magnetron with and without magnetron. Characterization of Paschen’s curve as well as discharge current with gas pressure at different distances between the discharge electrodes was introduced. Optimum conditions to operate such home-

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Open Access Library J. Vol.1, 2014
Doi:10.4236/oalib.1100650


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