scholarly journals Electron density measurement of an electrostatically-confined, spherically symmetric, helium plasma using a microwave cavity resonance shift technique

1973 ◽  
Author(s):  
William Harry Grush
Keyword(s):  
Electron Density ◽  
Density Measurement ◽  
Cavity Resonance ◽  
Microwave Cavity ◽  
Helium Plasma ◽  
Spherically Symmetric ◽  
Resonance Shift ◽  
Shift Technique

Electron density measurement in a rf helium plasma by laser‐collision induced fluorescence method

1996 ◽  
Vol 80 (6) ◽  
pp. 3196-3201 ◽  
Author(s):  
K. Dzierżȩga ◽  
K. Musiol/ ◽  
E. C. Benck ◽  
J. R. Roberts
Keyword(s):  
Electron Density ◽  
Density Measurement ◽  
Fluorescence Method ◽  
Helium Plasma

The Possibility of Measuring Electron Density of Plasma at Atmospheric Pressure by a Microwave Cavity Resonance Spectroscopy

2021 ◽  
pp. 1-8
Author(s):  
Jinming Li ◽  
Aleksandr M. Astafiev ◽  
Anatoly A. Kudryavtsev ◽  
Chengxun Yuan ◽  
Zhongxiang Zhou ◽  
...  
Keyword(s):  
Electron Density ◽  
Atmospheric Pressure ◽  
Cavity Resonance ◽  
Microwave Cavity ◽  
Resonance Spectroscopy

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

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.

scholarly journals In-situ measurement of dust charge density in nanodusty plasma

2021 ◽  
Author(s):  
Tim Jacobus Adrianus Staps ◽  
Tim Jacobus Maria Donders ◽  
Bart Platier ◽  
J Beckers
Keyword(s):  
Charge Density ◽  
Surface Charge ◽  
Orbital Motion ◽  
Industrial Applications ◽  
Light Extinction ◽  
Cavity Resonance ◽  
Microwave Cavity ◽  
Resonance Spectroscopy ◽  
Dust Grains ◽  
Dust Charge

Abstract A dust grain immersed in a low-pressure gas discharge obtains a permanent negative surface charge due to the high mobility of electrons compared to that of ions. This charge essentially governs all fundamental processes in dusty and complex plasmas involving dust grains, neutrals, (an)ions and electrons and—consequently—virtually all industrial applications of these types of plasmas are affected and steered by it. In this work, we have measured the surface charge by application of laser-induced electron detachment from nanosized dust grains in concert with microwave cavity resonance spectroscopy and laser light extinction. The main result is that the electron release is governed by photodetachment rather than by thermionic emission, and that recharging of the dust grains occurs on timescales that are well in agreement with the orbital-motion-limited (OML) theory. The total surface charge density residing on the dust grains inside the laser volume follows from the saturation of the photodetachment signal, which was used in combination with dust density values derived from extinction measurements to estimate the mean dust charge. The negative dust charge on the 140 nm (average) diameter dust grains in this work is obtained to be in the range of 273 − 2519 elementary charges, of which the lower bound matches well with analytical predictions using the orbital-motion-limited (OML) theory.

scholarly journals Electron Density Measurement by Using a Multi-Channel Interferometer System in the Tandem Mirror GAMMA 10

2007 ◽  
Vol 2 ◽  
pp. S1036-S1036 ◽  
Author(s):  
Masayuki YOSHIKAWA ◽  
Takatoshi MATSUMOTO ◽  
Yoriko SHIMA ◽  
Akinori NAKAHARA ◽  
Naoyuki YANAGI ◽  
...  
Keyword(s):  
Electron Density ◽  
Density Measurement ◽  
Tandem Mirror

scholarly journals Conceptual Design of Electron Density Measurement System for DEMO-Relevant Helical Plasmas

2012 ◽  
Vol 7 ◽  
pp. 2402013-2402013 ◽  
Author(s):  
Tsuyoshi AKIYAMA ◽  
Ryo YASUHARA ◽  
Tokihiko TOKUZAWA ◽  
Mitsutaka ISOBE ◽  
Kazuo KAWAHATA ◽  
...  
Keyword(s):  
Electron Density ◽  
Conceptual Design ◽  
Measurement System ◽  
Density Measurement
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