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Jun 30, 2020Open Access
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 ...
Jul 24, 2018Open Access
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 ...
Jan 22, 2018Open Access
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 ...
Jan 06, 2017Open Access
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 ...
Oct 07, 2014Open Access
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...
Aug 26, 2014Open Access
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 ...
Jul 30, 2014Open Access
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...
Jul 23, 2014Open Access
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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