scholarly journals Influence of metal vapours on radiation characteristics of air arc plasmas

2020 ◽  
Vol 7 (2) ◽  
pp. 30-35
Author(s):  
Milada Bartlová ◽  
Petr Kloc ◽  
Vladimír Aubrecht ◽  
Nadezda Bogatyreva
Keyword(s):  
Temperature Profile ◽  
Radiation Flux ◽  
Radiation Transfer ◽  
Plasma Temperature ◽  
Arc Plasma ◽  
Radiation Characteristics ◽  
Plasma Cylinder ◽  
Radiation Properties ◽  
Isothermal Plasma ◽  
Arc Plasmas

This paper deals with the evaluation of radiation properties of air arc plasma with various admixtures of Cu, Ag, and Fe, respectively. Under assumption of isothermal plasma cylinder, the net emission coefficients were calculated for various arc radii as a function of the plasma temperature up to 30000K. For plasma with prescribed temperature profile, the equation of radiation transfer was solved in the P1approximation, and the radiation flux and its divergence were calculated.

scholarly journals Approximate Determination of Radiation Properties in the Arc Plasmas With Admixtures of Copper Vapours

2019 ◽  
Vol 6 (3) ◽  
pp. 265-269
Author(s):  
N. Bogatyreva ◽  
M. Bartlová ◽  
V. Aubrecht ◽  
P. Kloc
Keyword(s):  
Spherical Harmonics ◽  
Thermal Plasma ◽  
Radiation Transfer ◽  
Approximate Determination ◽  
Absorption Coefficients ◽  
First Order ◽  
Radiation Properties ◽  
Arc Plasmas ◽  
The Way

The aim of this paper is to evaluate radiation properties of air arc plasmas with various admixtures of copper vapours. The first order of the method of spherical harmonics (P<sub>1</sub>-approximation) has been used as the way to solve the equation of radiation transfer. Calculations of the absorption coefficients for a thermal plasma have been performed as a function of the temperature and the frequency. The frequency variable in the equation of transfer was handled by means of multigroup method. Methods for prediction of the average absorption coefficients were described and compared in detail. The net emission coefficients have been determined for comparison.

scholarly journals Radiation Transfer in Arc Plasmas

2017 ◽  
Vol 4 (3) ◽  
pp. 253-256
Author(s):  
N. Bogatyreva ◽  
M. Bartlová ◽  
V. Aubrecht ◽  
P. Kloc
Keyword(s):  
Thermal Plasma ◽  
Radiation Transfer ◽  
Arc Plasma ◽  
Absorption Coefficients ◽  
Absorption Properties ◽  
Arc Plasmas

In this paper, attention has been given to the absorption properties of the arc plasma at the different pressure conditions. Calculations of the absorption coefficients for a thermal plasma have been performed as a function of the temperature and the frequency. Methods for prediction of the average absorption coefficients were described and compared in detail.

scholarly journals Multigroup Approximation of Radiation Transfer in SF6 Arc Plasmas

10.14311/1719 ◽  
2013 ◽  
Vol 53 (2) ◽  
Author(s):  
Milada Bartlova ◽  
Vladimir Aubrecht ◽  
Nadezhda Bogatyreva ◽  
Vladimir Holcman
Keyword(s):  
Frequency Dependence ◽  
Spherical Harmonics ◽  
Radiation Transfer ◽  
Absorption Coefficients ◽  
Averaging Methods ◽  
First Order ◽  
Temperature Range ◽  
Cylindrical Plasma ◽  
Radiation Properties ◽  
Arc Plasmas

The first order of the method of spherical harmonics (P1-approximation) has been used to evaluate the radiation properties of arc plasmas of various mixtures of SF6 and PTFE ((C2F4)n, polytetrafluoroethylene) in the temperature range (1000 ÷ 35 000) K and pressures from 0.5 to 5 MPa. Calculations have been performed for isothermal cylindrical plasma of various radii (0.01 ÷ 10) cm. The frequency dependence of the absorption coefficients has been handled using the Planck and Rosseland averaging methods for several frequency intervals. Results obtained using various means calculated for different choices of frequency intervals are discussed.

scholarly journals Design Study of a Miniaturized Multi-layered Antenna-in-package for 2.4 GHZ Wireless Communication

2018 ◽  
Vol 8 (5) ◽  
pp. 3627
Author(s):  
Jalal Naghar ◽  
Otman Aghzout ◽  
Azzeddin Naghar
Keyword(s):  
Low Cost ◽  
Middle Layer ◽  
Antenna Design ◽  
Radiation Characteristics ◽  
Radiation Properties ◽  
Compact Size ◽  
Parasitic Patch ◽  
Reflexion Coefficient ◽  
Miniaturized Antenna ◽  
Different Shapes

This paper proposes a novel miniaturization technique to enhance the radiation properties of small multi-layer patch antenna used in packaged circuits. The multilayered antenna design is composed of three layers with different shapes. An enhancement on the radiation properties has been obtained by optimizing the geometry of the radiated element and the parasitic conductor of the middle layer. The whole design has been implemented on the FR4 substrate with dielectric constant of 4.4, thickness of 1.6 mm and Copper thickness of 5 μm. The first layer is a driven element while second and the third layer are parasitic patch elements. The optimized multilayer antenna has a very small size of 12×6×5 mm^3. Considering the small size of the antenna, a detailed study of the parameter affecting the radiation has been considered to force the antenna to operate at 2.4 GHz band. Miniaturization techniques based on the current distribution have been also taken into account to shift down the resonant frequency and reduces more and more the antenna size at the designed operating frequency. The miniaturized antenna maintains performant radiation characteristics in terms of reflexion coefficient, bandwidth and directivity. All developed antennas are simulated using the commercial Electromagnetic CST Microwave Studio software. Achieved results demonstrate a good performance with low cost and compact size.

The Performance of Plasma and Multi-Physical Fields in DC Arc Plasma Reactor for CVD Diamond Film

2016 ◽  
Vol 852 ◽  
pp. 1140-1146
Author(s):  
Xiao Jing Li ◽  
Yong Liang Gao ◽  
Yan Yin ◽  
Shun Qi Zheng ◽  
Yang Sheng Zheng
Keyword(s):  
Diamond Film ◽  
Gas Flow ◽  
Plasma Reactor ◽  
Plasma Temperature ◽  
Chemical Vapor ◽  
Cvd Diamond ◽  
Arc Plasma ◽  
Cvd Diamond Film ◽  
Physical Fields ◽  
Dc Arc

Numerical simulation method was developed to investigate the performance of plasma and multi-physical fields in direct current (DC) arc plasma reactor for chemical vapor deposition (CVD) Diamond film,in order to obtain more information on the process of CVD. Finite Volume Method (FVM) was adopted. Continuous arc forming and the dynamic formation process of rotating arc plasma were shown in this paper. Multi-physics field in deposition chamber were modeled including flow field, temperature field. Distribution of velocity and temperature were obtained by solving momentum and energy equation with SIMPLE separation algorithm. Simulation results show that, plasma temperature near the cathode tip is the highest, which is more than 1×104K. The plasma distribution shape like the bell jar. The changing regularity of outlet velocity, temperature and static pressure with the distance from the anode center were revealed. The effectiveness of plasma temperature and gas flow calculated was confirmed by the experimental results. The research results provide the theoretical foundation for obtaining uniform diamond thick film.

Plasma temperature profile in the boundary layer of an MHD channel

1987 ◽  
Author(s):  
YOSHIAKI AOKI ◽  
TADASHI SEIDOU ◽  
NAOYUKI KAYUKAWA ◽  
HATSUO YAMAZAKI
Keyword(s):  
Boundary Layer ◽  
Temperature Profile ◽  
Plasma Temperature ◽  
Mhd Channel

scholarly journals Line radiation transfer in non-equilibrium laser plasma

1988 ◽  
Vol 6 (4) ◽  
pp. 703-708
Author(s):  
S. I. Kaśkova ◽  
G. S. Romanov ◽  
K. L. Stepanov
Keyword(s):  
Spectral Line ◽  
Source Function ◽  
Radiation Transfer ◽  
Resonance Scattering ◽  
Plasma Radiation ◽  
Line Profiles ◽  
Radiation Characteristics ◽  
Laser Target ◽  
Line Radiation ◽  
Frequency Redistribution

The self-radiation characteristics of plasma created under the effect of a powerful laser radiation on a target are considered. The radiation in the spectral range from 1 to 1300 Å is calculated in coherent assumption for given gas-dynamic fields corresponding to various phases of laser target explosion. The source function was determined in accordance with a plasma radiation-collision model with the assumption of its transparency. Calculations show that the contribution of line radiation to the total flux may be from 20 to 60%. Mainly, this paper considers radiation transfer. The effect of self-radiation on level populations and frequency redistribution at resonance scattering is taken into account. The resonance scattering is predominant in the coronal plasma. Exit of photons from deeper layers of the target in comparison with the coherent case increases. Macroscopic plasma motion leading to spectral line shift is taken into consideration in the calculations. Output radiation spectral intensity distribution in oxygen and silicon H-like ions resonance lines has been determined. Spectral line profiles calculated with account of basic broadening mechanisms were used.

Neoclassical thermal conductivity in ICP plasma at low pressure

2008 ◽  
Vol 74 (3) ◽  
pp. 353-360
Author(s):  
A.P. SMIRNOV ◽  
W. PARK ◽  
YA.N. ISTOMIN ◽  
D.P. KOSTOMAROV ◽  
E.A. SHEINA ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Temperature Profile ◽  
Plasma Temperature ◽  
Plasma Source ◽  
Quantitative Agreement ◽  
Main Chamber ◽  
Electron Trajectories ◽  
Low Pressures ◽  
Electromagnetic Accelerator ◽  
Rapid Drop

AbstractThe plasma temperature in a new plasma source shows unusual behaviour at low pressures (about 1 mTorr) and high absorbed powers. In Ar plasma at pressures of about 1 mTorr, the electron temperature shows a pronounced maximum inside an electromagnetic accelerator, which is followed by a rapid drop at the boundary between the accelerator region and the main chamber. In this paper a neoclassical thermo-conductivity model based on the analysis of the electron trajectories is proposed to describe the sharp electron temperature profile. Quantitative agreement of the calculated temperature profile with the experiment is observed.

Plasma Temperature Profile in the Boundary Layers of an MHD Channel

1986 ◽  
Vol 25 (Part 1, No. 2) ◽  
pp. 270-274 ◽  
Author(s):  
Yoshiaki Aoki ◽  
Tadashi Seidou ◽  
Hidetsuka Imajyo ◽  
Hiroki Kitagawa ◽  
Naoyuki Kayukawa ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Boundary Layers ◽  
Plasma Temperature ◽  
Mhd Channel
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