The key parameter driving behavior of dust particles in plasma is their electric charge [1]. Present-day theories as well as experiments are not fully successful in determining its value [2]. Moreover, the theoretical uncertainties are increased in the plasma sheath – a think plasma layer at a wall or electrode. The standard models of dust charging in the plasma sheath usually suppose Maxwellia...

In low-pressure discharges, where the electron mean free path is larger or comparable with the discharge length, the electron dynamics is essentially nonlocal. Moreover, the electron energy distribution function (EEDF) deviates considerably from a Maxwellian. Therefore, an accurate kinetic description of the low-pressure discharges requires knowledge of the nonlocal conductivity operator and ca...

A procedure for the reconstruction of electron energy distribution functions (EEDF) of low-temperature neon plasmas from optical emission spectroscopy data is presented. A data descriptive model, including the physics of the plasma discharge and the spectroscopic measurement is developed. Particular refinements of the model regarding the apparatus function of the spectrometer and the optical de...

We measured electron density and electron energy distribution function (EEDF) in our reactor by a Langmuir probe. The EEDF of Ar plasma in the reactor could largely be described by the Maxwell-Boltzmann distribution function, but it also contained a fraction (~10) of electrons which were much faster (20-40 eV). The peak of the fast-electron tail shifted from E ~ 35 eV at 11 μbar to E ~ 25 eV wh...

In the high potential plasma, upstream of the double layer, the measured electron energy distribution function EEDF shows a very clear change in slope at energies break corresponding to the double layer potential drop. Electrons with lower energy are Maxwellian with a temperature of 8 eV, whereas those with higher energy have a temperature of 5 eV. The EEDF in the downstream plasma has a temper...

Experimental studies of Electron Energy Distribution Function (EEDF) in well-defined conditions in Flowing Afterglow plasma using Langmuir probe are reported. EEDF was measured in pure helium at medium pressures (1600 Pa) during late afterglow (35 to 95 ms after discharge) in nearly relaxed thermal plasma (Te ~ 300–600 K). The influence of fast electrons produced in interactions of helium metas...

Microwaves are injected into argon and helium helicon plasmas at 6 to 20 mTorr neutral pressure, 1.2 kW pulsed microwave power, up to 500 W continuous RF power, and up to 1 kG magnetic fields, with the objective of heating the tail of the electron energy distribution function (EEDF) and populating ion metastable states. Langmuir probes are used to measure the EEDF and optical emission spectrosc...

The dynamics of a nanosecond discharge with an extended hollow cathode in argon is studied and the electron energy distribution function (EEDF) plasma column calculated. issues formation EEDF inside cavity are considered. conditions validity two-term approximation analyzed appropriate evaluations given. Keywords: cathode, pulse discharge, argon, function.

This paper reports on a modern implementation of a Langmuir probe method that was first proposed in the 1950’s. The system directly measures the first and second derivative of the I-V characteristic and determines the EEDF. This probe offers many advantages over existing systems that rely on numerical differentiating and data smoothing techniques. In addition to the EEDF analysis the system als...

Many packet schedulers for QoS networks are equipped with a rate control mechanism. The function of a rate control mechanism (rate controller) is to bu er packets from ows which exceed their negotiated tra c pro le. It has been established that rate controllers lead to reduced bu er requirements at packet switches, and do not increase the worst-case delays in a deterministic service. On the oth...