scholarly journals Ignition of A Plasma Discharge Inside An Electrodeless Chamber: Methods and Characteristics

Plasma ◽  
2019 ◽  
Vol 2 (4) ◽  
pp. 380-386 ◽  
Author(s):  
Laroussi
Keyword(s):  
Electron Number Density ◽  
Plasma Electron ◽  
Pulsed Plasma ◽  
Number Density ◽  
Reduced Pressure ◽  
Charge Coupled Device ◽  
Pressure Discharge ◽  
Expansion Speed ◽  
Discharge Parameters ◽  
Intensified Charge Coupled Device

In this paper the generation and diagnostics of a reduced pressure (300 mTorr to 3 Torr) plasma generated inside an electrodeless containment vessel/chamber are presented. The plasma is ignited by a guided ionization wave emitted by a low temperature pulsed plasma jet. The diagnostics techniques include Intensified Charge Coupled Device (ICCD) imaging, emission spectroscopy, and Langmuir probe. The reduced-pressure discharge parameters measured are the magnitude of the electric field, the plasma electron number density and temperature, and discharge expansion speed.

scholarly journals Comparison of the Plasma Temperature and Electron Number Density of Pulsed Electrolyte Cathode Atmospheric Pressure Discharge and Direct Current Solution Cathode Glow Discharge

2018 ◽  
Author(s):  
Jinmei Wang ◽  
Shiyu Li ◽  
Peichao Zheng ◽  
Yanying Chen
Keyword(s):  
Glow Discharge ◽  
Atmospheric Pressure ◽  
Electron Number Density ◽  
Number Density ◽  
Electron Number ◽  
Discharge System ◽  
Flowing Liquid ◽  
Pressure Discharge ◽  
Atmospheric Pressure Discharge ◽  
Electrolyte Cathode

A novel plasma source of pulsed electrolyte cathode atmospheric pressure discharge (pulsed-ECAD) driven by an alternating current (AC) power supply coupled with a high voltage diode was generated, and the discharge was generated in the open-to-air atmosphere between a metal electrode and a small-sized flowing liquid cathode. The spatial distribution of plasma temperatures (excitation, vibrational and rotational) of the pulsed-ECAD were investigated. The electron excitation temperature of H Texc(H), vibrational temperature of N2 Tvib(N2), and rotational temperature of OH Trot(OH) were measured as 4900±36-6800±108 K, 4600±86-5800±100 K and 1050±20-1140±10 K, respectively. Meanwhile, the temperature characteristics of dc solution cathode glow discharge (dc-SCGD) were also studied for comparison with pulsed-ECAD. The effects of operating parameters, including discharge voltage and discharge frequency, on the plasma temperatures were investigated. The electron number density determined in the discharge system and dc-SCGD were within the range (3.8–18.9) ×1014 cm-3 and 2.6×1014-17.2×1014 cm-3, respectively.

scholarly journals Controlling the plasma electron number density of copper metal using NIR picosecond laser-induced plasma spectroscopy

2021 ◽  
Vol 51 (3) ◽  
Author(s):  
Mohamed Fikry ◽  
Walid Tawfik ◽  
Magdy Omar
Keyword(s):  
Laser Pulse ◽  
Electron Density ◽  
Pulse Energy ◽  
Electron Number Density ◽  
Laser Pulse Energy ◽  
Plasma Electron ◽  
Plasma Spectroscopy ◽  
Number Density ◽  
Copper Metal ◽  
Density Values

In this paper, we investigate a new method to control the plasma electron number density of copper metal using a near-infrared (NIR) picosecond Nd:YAG laser-induced plasma spectroscopy (LIPS) technique. The applied laser parameters are as follows; laser pulse energy and intensity varied from 29.2 to 59.4 mJ ± 3% and from 6.01×1010 to 12.35×1010 W/cm2 ± 5%, respectively, for a single pulse at 170 ps pulse duration, and beam diameter about 0.5 ± 0.1 mm. By considering the Stark broadening of a specific spectral line, electron density can be calculated using a neutral copper line at 521.8 nm, assuming the local thermodynamic equilibrium (LTE) condition. The observed electron density values were 1.09×1016, 2.24×1016, 3.60×1016, and 4.75×1016 cm–3 for the laser pulse energies 29.2, 41, 52.4, and 59.4 mJ, respectively. The plasma electron density values are increased with the increase in laser pulse energy. Such findings were interpreted due to an increase in the mass ablation rates with laser pulse energy. The obtained results explore the ability to control the plasma electron density by controlling the picosecond pulse energy. These results can contribute to the development of plasma technologies and their applications in many fields.

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