A Brief Study on the Ignition of the Non-Thermal Atmospheric Pressure Plasma Jet from a Double Dielectric Barrier Configured Plasma Pencil

Abstract

To understand the self sustained propagation of the plasma jet/bullet in air under atmospheric pressure, the ignition of the plasma jet/bullet, the plasma jet/bullet ignition point in the plasma pencil, the formation time and the formation criteria from a dielectric barrier configured plasma pencil were investigated in this study. The results were confirmed by comparing these results with the plasma jet ignition process in the plasma pencil without a dielectric barrier. Electrical, optical, and imaging techniques were used to study the formation of the plasma jet from the ignition of discharge in a double dielectric barrier configured plasma pencil. The investigation results show that the plasma jet forms at the outlet of the plasma pencil as a donut shaped discharge front because of the electric field line along the outlet's surface. It is shown that the required time for the formation of the plasma jet changes with the input voltage of the discharge. The input power calculation for the gap discharge and for the whole system shows that 56% of the average input power is used by the first gap discharge. The estimated electron density inside the gap discharge is in the order of 10 11 cm −3 . If helium is used as a feeding gas, a minimum 1.48×10 −8 C charge is required per pulse in the gap discharge to generate a plasma jet.

Electron characterization in weakly ionized collisional plasmas: from principles to techniques

“…As pointed out above, the use of electrical probes for atmospheric-pressure plasmas is still challenging. Recent investigations have been devoted to utilizing Langmuir probes for atmospheric-pressure plasmas [121][122][123], and new concepts of electrical probes have been suggested [124]. Nonetheless, due to their intrusive nature, such physical probes can markedly alter the fundamental plasma properties under investigation.…”

Simulation of interaction between two counter-propagating streamers

“…Numerical simulations [7][8][9][10] based on streamer models have described a number of features of plasma bullets (annular structure, polarity effects, etc) in agreement with observations. The streamer mechanism of plasma bullets is also supported by measurements of the electric field distribution along plasma jets [11,12].…”

Plasma for cancer treatment

“…Various diagnostic tools have been developed to probe CAP. Nowadays routine diagnostics include intensified charge-coupled device (ICCD) cameras, optical emission spectroscopy and electrical measurements of the discharge properties [30][31][32][33][34][35]. Time-resolved measurements of the emission were performed for the case of very dense plasmas ~10 16 -10 17 cm −3 using passive optical emission spectroscopy [36].…”