In the current study, plasma-polymerized methyl methacrylate (PP-MMA) generation on inner surface of a silicone tube was performed in capacitively coupled discharge reactor. The possibility generating plasma inside analyzed and calculated by using optical emission spectroscopy (OES). A hollow cathode model first proposed to determine whether would be generated low-pressure regime. Since ignitio...

The collision frequency should definitely be taken into account in high pressure discharges. In this work by using forth order of Rung Kuta method, and two-fluid model, temperature dependence of the characteristics of a collisional DC plasma sheath, such as electric field, electric potential, ion and electron number density, and ion velocity, has been studied. It will be shown in the constant c...

A self-consistent three-dimensional model for a complex (dusty) plasma is used to study the effects of multiple-sized dust grains in a dust crystal. In addition to the interparticle forces, which interact through a Yukawa potential, the model includes the effects of gravity, the variation of the sheath potential above the powered electrode, and a radial confining potential. Simulations studied ...

Plasma turbulence in a linear device is explored for the first time with three-dimensional global two-fluid simulations, focusing on the plasma parameters of the Large Plasma Device. Three instabilities are present in the simulations: the Kelvin-Helmholtz instability, a sheath-driven instability, and a resistive drift wave instability. The Kelvin-Helmholtz mode is shown to dominate the transpor...

A laser-induced-fluorescence diagnostics was set up for the investigation of ion flows in negative ion containing plasmas. The contingent of negative ions in Ar plasmas is varied by admixing O2. Results on flow measurements in different plasma devices are reported. First measurements were carried out in the linear double-plasma device, in the sheath region in front of an electrically floating p...

We present in this work a numerical study of the collisionless kinetic sheath at a plasma-wall transition in the one dimensional phase-space, using an Eulerian Vlasov code. Both electrons and ions are treated with a kinetic Vlasov equation. The Vlasov equation is solved directly in the 1D phase-space by a fractional step method previously reported in the literature [1-3]. It is well known that ...

Space resolved concentrations of helium He (S1) metastable atoms in an atmospheric pressure radio-frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. The spatial profile of metastable atoms in the volume between the electrodes was deduced for various electrode gap distances. Density profiles reveal the sheath structure and reflect the plasma excitation di...

of Science Topic: The ambient plasma and solar UV incident on the lunar surface cause it to become electrically charged [1,2]. On the dayside, solar UV photocharging typically dominates, so the surface charges positive [3,4]; while on the nightside the plasma electrons usually dominate and thus the surface charges negative [5]. The resulting surface electric potential is confined to a near-surf...

Controlled nuclear fusion could provide our society with a clean, safe, and virtually inexhaustible source of electric power production. The tokamak has proven to be capable of producing large amounts of fusion reactions by confining magnetically the fusion fuel at sufficiently high density and temperature, thus in the plasma state. Because of turbulence, however, high temperature plasma reache...

We present a numerical model for two-species bounded plasma discharge with a time varying potential at 0.1 torr pressure in collisional and collisionless regimes. The plasma-wall problem is modeled using hydrodynamic equations coupled with the Poisson equation. The model is based on a robust finite element algorithm utilized to overcome the stiffness of the plasma-wall equations. Appropriate fl...