Paschen curves and current–voltage characteristics of large-area short glow discharge with different electrode structures

Abstract

In this work, the Paschen curves and current–voltage characteristics of three large-area short glow discharge structures with grid and solid plate electrodes are studied. The study of the Paschen's curves reveals that Paschen's law is broken for all three investigated electrode structures. It is shown that the experimentally measured Paschen curves are well approximated with a modified Paschen's law. A comparison of the current–voltage characteristics of the short glow discharge in the three types of electrode structures reveals that the use of grid electrodes allows for the increase in the discharge current. The effects of the electrode gap, which were varied from 1 mm to 7 mm, on the Paschen curves and current–voltage characteristics of short glow discharges are also investigated.

Attenuation of Microwave Radiation by Post-Anode Plasma in a Composite Grid Electrode Structure

“…To measure the Paschen curves for different structures, we used the electrical circuit shown in Figure 2 in ref [49]. The digital oscilloscope was used to measure the breakdown voltage.…”

“…After measuring the breakdown voltage Ubr under certain conditions, the voltage was further applied, and then the voltage of the high-voltage power supply and the voltage on the resistor were recorded. The voltage Up across the plasma and the current I in the entire circuit were then determined by these values [49]. To determine the voltage drop Up on the plasma we are subtracted the voltage drop UR on the shunt resistor from the output voltage U of the high voltage power supply: Up = U -UR.…”

“…It is important to note that there are a number of factors affecting the value of the breakdown voltage of the electrode structure: (1) the product of pressure and the gap length between grid anode and cathode plate [39]; (2) the selection of an optimal breakdown path of the electrode structure by discharge [50]- [53]; (3) variation of the mean free path of electrons between grid anode and cathode plate; (4) change in the energy of electrons [49]; and others. When the pressure increases, the particle density increases and the frequency of electron collisions with neutral particles increases, resulting in more collisions within the electrode gap.…”

Impact of the electrode structure on post‐cathode plasma in the grid electrode DC glow discharge

“…In the experiment, the abnormal glow discharge phase of the plasma could be determined through the I–V curve. [ 20 ] Based on this fact, in this experiment, the maintenance of the Self‐sustaining plasma is mainly related to the secondary electron emission.…”

Spectral Characteristics of DC Short Glow Discharge Plasma With Grid Electrodes

“…On this basis, the characteristics of DC short glow discharge between grid anode and solid-plate cathode are studied, together with two others electrode structures [24]. The results reveal that glow discharge with grid anode violates the Paschen's law.…”