Determining the electron temperature and the electron density by a simple collisional–radiative model of argon and xenon in low-pressure discharges

2008 ◽  
Vol 42 (2) ◽  
pp. 025203 ◽  
Author(s):  
Xi-Ming Zhu ◽  
Wen-Cong Chen ◽  
Jiang Li ◽  
Yi-Kang Pu
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Low Pressure ◽  
Collisional Radiative Model ◽  
Radiative Model

scholarly journals Diagnostics of low-pressure capacitively coupled RF discharge argon plasma

2019 ◽  
Vol 13 (27) ◽  
pp. 76-82
Author(s):  
Kadhim A. Aadim
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Langmuir Probe ◽  
Gas Flow ◽  
Low Pressure ◽  
Gas Pressure ◽  
Rf Discharge ◽  
Electrode Gap ◽  
Probe Characteristic ◽  
Capacitively Coupled

Low-pressure capacitively coupled RF discharge Ar plasma has been studied using Langmuir probe. The electron temperature, electron density and Debay length were calculated under different pressures and electrode gap. In this work the RF Langmuir probe is designed using 4MHz filter as compensation circuit and I-V probe characteristic have been investigated. The pressure varied from 0.07 mbar to 0.1 mbar while electrode gap varied from 2-5 cm. The plasma was generated using power supply at 4MHz frequency with power 300 W. The flowmeter is used to control Argon gas flow in the range of 600 standard cubic centimeters per minute (sccm). The electron temperature drops slowly with pressure and it's gradually decreased when expanding the electrode gap. As the gas pressure increases, the plasma density rises slightly at low gas pressure while it drops little at higher gas pressure. The electron density decreases rapidly with expand distances between electrodes.

scholarly journals Theoretical Modeling of High-Resolution X-ray Spectra Emitted by Tungsten and Molybdenum Ions from Tokamak Plasmas

2020 ◽  
Vol 39 (5) ◽  
pp. 194-201
Author(s):  
Ł. Syrocki ◽  
K. Słabkowska ◽  
E. Węder ◽  
M. Polasik ◽  
J. Rzadkiewicz
Keyword(s):  
High Temperature ◽  
High Resolution ◽  
Detailed Analysis ◽  
Electron Density ◽  
Wavelength Range ◽  
Tokamak Plasmas ◽  
Temperature Plasma ◽  
X Ray ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to allow the advanced interpretation of the X-ray spectra registered by the high-resolution crystal KX1 spectrometer on the JET with an ITER-like wall, especially to determine how the relative emission contributions of tungsten and molybdenum ions change during a JET discharge, the X-ray spectra have been carefully modeled over a narrow wavelength range. The simulations have been done in the framework of Collisional–Radiative model implemented in Flexible Atomic Code for an electron density (ne = 2.5 × 1019 m−3), and electron temperatures between Te = 3.0 keV and Te = 4.5 keV, typical for JET. Moreover, performed detailed analysis in the framework of the proposed procedure can be useful in determining temperature of a high temperature plasma generated in tokamaks.

scholarly journals Optical Diagnostic Characterization of the Local Arc on Contaminated Insulation Surface at Low Pressure

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6116
Author(s):  
Hao Yang ◽  
Haotian Zhang ◽  
Wen Cao ◽  
Xuanxiang Zhao ◽  
Ran Wen ◽  
...  
Keyword(s):  
Electron Temperature ◽  
High Altitude ◽  
Electron Density ◽  
Leakage Current ◽  
Diagnostic Method ◽  
Low Pressure ◽  
Air Pressure ◽  
Supplementary Information ◽  
Optical Diagnostic ◽  
Contamination Flashover

Flashover of contaminated insulators is a major problem for power systems at high altitude. Laboratory experiments have shown that the optical diagnostic method can provide extensive information on the physical process of contamination flashover. In this paper, a study of the local arc on a wet polluted surface under low pressure by using the optical diagnostic method is presented. The thickness of the continuous spectrum, spectral line intensity and the spectral composition varies significantly in different stages of the local arc development. Thermodynamic parameters of the local arc (including electron temperature, electron density and conductivity) are obtained by analyzing the spectra. Both the electron temperature and the conductivity increase with the increase in leakage current and air pressure. Although the electron density does not change significantly with an increase in leakage current, it increases significantly with an increase in air pressure. The findings of this work could be used as supplementary information for the investigation of local arc parameters, thus providing a reliable reference for the calculation of contamination flashover at high altitude.

Spektroskopische Diagnostik eines nichtthermischen He-Plasmas in der Hochstromfackel / Spectroscopical Diagnostics of a non-thermal He-Plasma Jet

1974 ◽  
Vol 29 (11) ◽  
pp. 1690-1691
Author(s):  
H. Mauderer ◽  
G. Schmid
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Radial Distribution ◽  
Stark Effect ◽  
Plasma Jet ◽  
Low Pressure ◽  
Gas Temperature ◽  
Population Densities ◽  
Forbidden Transitions ◽  
Experimental Values

The properties of a low-pressure non-thermal He-plasma jet have been investigated. The gas temperature was obtained from the population densities of high excited He-levels. The electron density was determined both from the Stark-effect broadening of some He-lines and from the intensities of some forbidden transitions. The radial distribution of electron temperature was found by comparing the computed population densities of the He 31P level with the experimental values.

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