Neon Discharge Plasma Research Articles

On the Application of Neon Discharge Plasmas in Construction of Plasma Waveguide Attenuators

Many papers and texts can be found on waveguide attenuators filled with magnetized (biased) or unmagnetized (unbiased) plasma layers; but there are no works on experimental verification and numerical modeling with electromagnetic softwares such as CST MICROWAVE STUDIO, HFSS, or ANSYS Electromagnetics. In this paper, we have demonstrated the application and properties of neon discharge plasmas in construction of X-band plasma waveguide attenuators, by both experimental and various numerical and theoretical simulations. The effects of tube lengths on attenuation are also investigated. One of the advantages of plasma waveguides is that their dielectric constant is sensitive to frequency, and hence, the amount of wave transmission can be controlled. Moreover, plasma can be set off and on very quickly, and therefore, we can remove its effects without removing the plasma waveguide physically.

Abrupt changes in neon discharge plasma detected via the optogalvanic effect

When a laser is tuned between two excited energy levels of a gas in a Direct Current discharge lamp, the discharge current will experience a temporary disturbance lasting tens or hundreds of microseconds known as the optogalvanic effect. We have carried out extensive studies of optogalvanic effects in neon discharge plasmas for transitions at 621.7nm, 630.5nm, 638.3nm, 650.7nm and 659.9nm. A nonlinear least-squares Monte Carlo technique has been used to determine the relevant amplitude coefficients, decay rates and the instrumental time constant. We discovered an abrupt change in the neon discharge plasma at a discharge current of about 6mA.

The Nonstationary Behaviour of the Electron Current Density in the Weakly Inonized Plasma at High Field Frequencies

AbstractBased upon former studies concerning the nonstationary electron kinetics in collision dominated, weakly ionized plasmas the phase delay between the ac electric field component and the resultant ac electron current density has been analysed, theoretically and experimentally, under the specific conditions of a microwave field superimposed to a dc discharge plasma column. The complex plasma conductivity and thus the phase delay has been calculated by solving an appropriate electron kinetic equation. The same quantities have been experimentally determined by using the microwave cavity which operates with different resonator modes. A comprehensive comparison between calculated and measured quantities for different neon discharge plasmas leads to a complete confirmation of the theoretical expectations.

Effect of an Acoustic Pulse Wave on Striated Neon Discharge Plasma

Effect of an Acoustic Pulse Wave on Striated Neon Discharge Plasma