Density dependence of capillary plasma on the pressure and applied voltage

Abstract

Based on a simple theoretical model, the density properties of the electrical discharge in a capillary plasma system are investigated in terms of the hydrogen pressure and applied voltage. The electron density in the capillary during the electrical discharge is calculated from a theoretical model and compared with experimental observations, providing valuable information pertaining to the ionization ratio and conductivity of discharge plasma. The electron density increases almost linearly with the applied voltage for a specified pressure. Meanwhile, the ionization ratio is inversely proportional to the square root of the hydrogen gas pressure.

DBD Plasma Combined with Different Foam Metal Electrodes for CO2 Decomposition: Experimental Results and DFT Validations

“…One of the critical factors affecting the CO 2 conversion by DBD plasma is the discharge power. The discharge can change the electric field of the plasma reactor, thereby changing the amount of active electrons and active radicals [29]. For an empty tube, it can be noted that increasing the discharge power from 30 W to 90 W results in an improvement in CO 2 conversion.…”

Optical diagnostics for density measurement in high-quality laser-plasma electron accelerators

“… Standard TAI , such as Mach–Zehnder interferometers, where the light beam is split into two distinct beams following different geometrical paths, called the reference and measurement arms, which are then recombined and interfere [7, 23, 24] . Modified TAIs , also called two-arm folded, where the light beam is split into two parts after passing through the sample, and interference takes place between the part of the beam that has passed through the sample and the part of the beam not passing through the sample [18, 25] . This method provides good control on the fringe spacing and image formation.…”

“…Standard TAI , such as Mach–Zehnder interferometers, where the light beam is split into two distinct beams following different geometrical paths, called the reference and measurement arms, which are then recombined and interfere [7, 23, 24] .…”

“…Two-arm interferometry can be implemented in two main configurations, depending on the optical design adopted. I Standard TAI, such as Mach-Zehnder interferometers, where the light beam is split into two distinct beams following different geometrical paths, called the reference and measurement arms, which are then recombined and interfere [7,23,24] .…”

“…All interferometric methods require an appropriate optical line of sight through the sample. In the case of a freely expanding gas jet, interferometry is easy to implement, whereas in the case of confined samples (for example, gas cells and square cross-section capillaries), flat optical side windows are necessary to provide the optical path for transverse interferometry [4,[6][7][8] . If a transverse line of sight is not present (as in cylindrical capillaries), then longitudinal interferometry must be adopted, resulting in an average density value along the main laser beam propagation direction.…”