Use of He(I) 447.1-nm Line with Forbidden Component for Electron Density Determination in Plasmas

1997 ◽  
Vol 51 (3) ◽  
pp. 396-400 ◽  
Author(s):  
Z. Mijatović ◽  
R. Kobilarov ◽  
S. Djurović ◽  
M. Stevanov
Keyword(s):  
Electron Density ◽  
Plasma Density ◽  
Laser Interferometer ◽  
Density Measurement ◽  
Plasma Source ◽  
Density Determination ◽  
Pulsed Arc

Four parameters of the He(I) 447.1-nm line with a forbidden component were measured. A pulsed arc was used as a plasma source. Electron density in the range (1.9–5.9) 1021 m−3 was measured with a CO2 laser interferometer. On the basis of the comparisons of the obtained results with several theories and empirical formulae for plasma density determination, it is shown that this line could be used for simple but precise electron density measurement, with an error < 10%.

Plasma density measurement and downstream etching of silicon and silicon oxide in Ar/NF3 mixture remote plasma source

2019 ◽  
Vol 21 (6) ◽  
pp. 064007
Author(s):  
H J YEOM ◽  
D H CHOI ◽  
Y S LEE ◽  
J H KIM ◽  
D J SEONG ◽  
...  
Keyword(s):  
Plasma Density ◽  
Silicon Oxide ◽  
Density Measurement ◽  
Plasma Source ◽  
Remote Plasma

Electron Density Measurement of a Tokamak Plasma by an HCN-Laser Interferometer

1976 ◽  
Vol 15 (9) ◽  
pp. 1753-1760
Author(s):  
Akimitsu Nishizawa ◽  
Masaru Masuzaki ◽  
Akihiro Mohri
Keyword(s):  
Electron Density ◽  
Laser Interferometer ◽  
Density Measurement ◽  
Tokamak Plasma ◽  
Hcn Laser

CO2 laser interferometer for electron density measurement in JT‐60U tokamak

1992 ◽  
Vol 63 (10) ◽  
pp. 4971-4973 ◽  
Author(s):  
Yasunori Kawano ◽  
Akira Nagashima ◽  
Shinichi Ishida ◽  
Takeshi Fukuda ◽  
Tohru Matoba
Keyword(s):  
Electron Density ◽  
Co2 Laser ◽  
Laser Interferometer ◽  
Density Measurement

scholarly journals A Beat-Modulated 118.8-μm CH3OH Laser Interferometer System and Its Application to the Electron Density Measurement of JIPP T-II Plasma

1981 ◽  
Vol 45 (5) ◽  
pp. 479-498
Author(s):  
A. Nishizawa ◽  
N. Noda ◽  
J. Fujita ◽  
M. Yamanaka ◽  
Y. Takeda ◽  
...  
Keyword(s):  
Electron Density ◽  
Laser Interferometer ◽  
Density Measurement

Infrared laser polarimetry for electron density measurement in tokamak plasmas

2001 ◽  
Vol 72 (1) ◽  
pp. 1068-1072 ◽  
Author(s):  
Yasunori Kawano ◽  
Shin-ichi Chiba ◽  
Akira Inoue
Keyword(s):  
Electron Density ◽  
Density Measurement ◽  
Infrared Laser ◽  
Tokamak Plasmas ◽  
Laser Polarimetry

Schlieren method with narrow screen for electron density determination in a plasma

1985 ◽  
Vol 35 (2) ◽  
pp. 155-157 ◽  
Author(s):  
P. Kubeš ◽  
J. Kravárik ◽  
J. Bacílek ◽  
J. Hruška ◽  
V. Kraváriková ◽  
...  
Keyword(s):  
Electron Density ◽  
Schlieren Method ◽  
Density Determination

scholarly journals A Method to Improve Electron Density Measurement of Cone-Beam CT Using Dual Energy Technique

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kuo Men ◽  
Jian-Rong Dai ◽  
Ming-Hui Li ◽  
Xin-Yuan Chen ◽  
Ke Zhang ◽  
...  
Keyword(s):  
Electron Density ◽  
Cone Beam Ct ◽  
Density Measurement ◽  
Dual Energy ◽  
Cone Beam ◽  
Imaging Method ◽  
Basis Material ◽  
X Ray ◽  
Dual Energy Imaging ◽  
Set Up

Purpose. To develop a dual energy imaging method to improve the accuracy of electron density measurement with a cone-beam CT (CBCT) device.Materials and Methods. The imaging system is the XVI CBCT system on Elekta Synergy linac. Projection data were acquired with the high and low energy X-ray, respectively, to set up a basis material decomposition model. Virtual phantom simulation and phantoms experiments were carried out for quantitative evaluation of the method. Phantoms were also scanned twice with the high and low energy X-ray, respectively. The data were decomposed into projections of the two basis material coefficients according to the model set up earlier. The two sets of decomposed projections were used to reconstruct CBCT images of the basis material coefficients. Then, the images of electron densities were calculated with these CBCT images.Results. The difference between the calculated and theoretical values was within 2% and the correlation coefficient of them was about 1.0. The dual energy imaging method obtained more accurate electron density values and reduced the beam hardening artifacts obviously.Conclusion. A novel dual energy CBCT imaging method to calculate the electron densities was developed. It can acquire more accurate values and provide a platform potentially for dose calculation.

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