Abstract The information about the electron population of a helicon source plasma that expands along magnetic nozzle is important for understanding acceleration across potential drop forms in nozzle. electrons need an energy higher than to escape from source. At these energies signal Langmuir probe less accurate. An inverted RFEA measures high-energy tail electrons. To reach probe, they must ha...

The National Spherical Torus Experiment (NSTX) has recently studied the use of a liquid lithium divertor (LLD). Divertor Langmuir probes have also been installed for making measurements of the local plasma conditions. A non-local probe interpretation method is used to supplement the classical probe interpretation and obtain measurements of the electron energy distribution function (EEDF) which ...

A preliminary analysis of the flow between a jet of argon plasma and one containing argon excited states is conducted using the direct simulation Monte Carlo method (DSMC). As a prelude to the use of more advanced models and to help design the accompanying experiment, a simplified model is formulated that ignores electron kinetics and field effects. This model allows the capture of most of the ...

Abstract – In this paper, the effect of applied electric field on the damage due to partial discharges activity into the surroundings dielectrics of a narrow channel encapsulated within the volume of a dielectric material is evaluated using a kinetic model based on Particle in Cell - Monte Carlo Collision (PIC-MCC) model. After application of an electric field across a dielectric material which...

The time-dependent Boltzmann equation (BE) is solved in a two-term and a multi-term approximation in order to study the time evolution of the electron energy distribution function (EEDF) in argon plasma in a constant electric field. The initial distribution is taken to be isotropic Gaussian distribution, its center is set to the area of increasing elastic collision cross-section in order to stu...

Particle in cell (PIC) simulations are employed to investigate the effect of excitation frequency x on electron energy distribution functions (EEDFs) in a low pressure radio frequency (rf) discharge. The discharge is maintained over a length of 0.10 m, bounded by two infinite parallel plates, with the coherent heating field localized at the center of the discharge over a distance of 0.05 m and ...

Different approaches to study vibrational kinetics coupled to electron one for modeling different kinds of negative ion sources are presented. In particular two types of sources are investigated. The first one is a classical negative ion source in which the plasma is generated by thermoemitted electrons; in the second one, electrons already present in the mixture are accelerated by an RF field ...

We observe important isotopic differences in plasma composition as H 2 or D 2 are added to Ar. Specifically, Ar M density and ion flux composition depend on isotopic composition, which. enables novel tailoring of plasma surface fluxes/interactions, and presents a sensitive test/validation of models. Gas-phase impurities in plasmas cause changes in plasma properties and plasma-material interacti...

Commonly, laser-induced plasma expansion is modeled by assuming local thermodynamic equilibrium conditions for all plasma components. In the present work, we investigate the case of plasma containing electrons obeying a non-Maxwellian distribution. To this purpose, a twofluid model is considered with charge quasi-neutrality assumption. The deduced set of nonlinear differential equations is solv...