Influence of dust particles on the bulk electron density in radio frequency plasmas measured by microwave interferometry

2015 ◽  
Vol 22 (12) ◽  
pp. 123702 ◽  
Author(s):  
Carsten Killer ◽  
Thomas Wegner ◽  
André Melzer ◽  
Jürgen Meichsner
Keyword(s):  
Radio Frequency ◽  
Electron Density ◽  
Dust Particles ◽  
Microwave Interferometry

scholarly journals Study of the Propagation Characteristics of Terahertz Waves in a Collisional and Inhomogeneous Dusty Plasma with a Ceramic Substrate and Oblique Angle of Incidence

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Qingwen Rao ◽  
Guanjun Xu ◽  
Pengfei Wang ◽  
Zhengqi Zheng
Keyword(s):  
Electron Density ◽  
Dusty Plasma ◽  
Collision Frequency ◽  
Incident Angle ◽  
Ceramic Substrate ◽  
Dust Particles ◽  
Angle Of Incidence ◽  
Oblique Angle ◽  
Terahertz Waves ◽  
Thz Wave

In this paper, the propagation properties of a terahertz (THz) wave in a collisional and inhomogeneous dusty plasma with a ceramic substrate and oblique angle of incidence are studied using the scattering matrix method. The influence of the various corresponding parameters, such as the frequency of the THz wave, angle of incidence, electron density, radius and density of the dust particles, and the collision frequency, on the absorbance and transmittance is calculated. The results of the simulation indicate that an increase in the wave frequency increases the transmittance and decreases the absorbance. Moreover, the absorbance of a THz wave in a dusty plasma with a ceramic substrate increases with an increase in the incident angle, maximum electron density, coefficient of steepness, density and radius of the dust particles, and collision frequency. These results provide an important theoretical basis for the problem of communication blackout between ground and spacecraft.

scholarly journals The effect of electron bite-outs on artificial electron heating and the PMSE overshoot

2005 ◽  
Vol 23 (12) ◽  
pp. 3633-3643 ◽  
Author(s):  
M. Kassa ◽  
O. Havnes ◽  
E. Belova
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Electron Density Profile ◽  
Dust Particles ◽  
High Electron ◽  
Heating Effect ◽  
Ion Temperature ◽  
Degree Of Ionization ◽  
Electron Heating ◽  
Transmitter Power

Abstract. We have considered the effect that a local reduction in the electron density (an electron bite-out), caused by electron absorption on to dust particles, can have on the artificial electron heating in the height region between 80 to 90km, where noctilucent clouds (NLC) and the radar phenomenon PMSE (Polar Mesospheric Summer Echoes) are observed. With an electron density profile without bite-outs, the heated electron temperature Te,hot will generally decrease smoothly with height in the PMSE region or there may be no significant heating effect present. Within a bite-out Te,hot will decrease less rapidly and can even increase slightly with height if the bite-out is strong. We have looked at recent observations of PMSE which are affected by artificial electron heating, with a heater cycling producing the new overshoot effect. According to the theory for the PMSE overshoot the fractional increase in electron temperature Te,hot/Ti, where Ti is the unaffected ion temperature=neutral temperature, can be found from the reduction in PMSE intensity as the heater is switched on. We have looked at results from four days of observations with the EISCAT VHF radar (224 MHz), together with the EISCAT heating facility. We find support for the PMSE overshoot and heating model from a sequence of observations during one of the days where the heater transmitter power is varied from cycle to cycle and where the calculated Te,hot/Ti is found to vary in proportion to the transmitter power. We also looked for signatures of electron bite-outs by examining the variation of Te,hot/Ti with height for the three other days. We find that the height variation of Te,hot/Ti is very different on the three days. On one of the days we see typically that this ratio can increase with height, showing the presence of a bite-out, while on the next day the heating factor mainly decreases with height, indicating that the fractional amount of dust is low, so that the electron density is hardly affected by it. On the third day there is little heating effect on the PMSE layer. This is probably due to a sufficiently high electron density in the atmosphere below the PMSE layer, so that the transmitted heater power is absorbed in these lower layers. On this day the D-region, as given by the UHF (933MHz) observations, extends deeper down in the atmosphere than on the other two days, indicating that the degree of ionization in and below the PMSE layers is higher as well.

Analysis of the interaction between particles in non-ideal quasi-equilibrium extended systems

2010 ◽  
Vol 76 (3-4) ◽  
pp. 593-602
Author(s):  
O. S. VAULINA ◽  
E. A. LISIN ◽  
A. V. GAVRIKOV ◽  
O. F. PETROV ◽  
V. E. FORTOV
Keyword(s):  
Inverse Problem ◽  
Radio Frequency ◽  
Dusty Plasma ◽  
Statistical Physics ◽  
Dust Particles ◽  
Langevin Equations ◽  
Quasi Equilibrium ◽  
Experimental Application ◽  
Extended Systems ◽  
Radio Frequency Discharge

AbstractTwo techniques for the analysis of the interaction between particles in non-ideal quasi-equilibrium extended systems are considered. The first technique is based on a solution of the inverse problem describing the movement of dust particles by a system of Langevin equations. The second technique proceeds from the basic integral approaches of statistical physics. The conditions for the correct use of these techniques are presented, together with the results of their experimental application for the analysis of inter-grain interactions in the dusty plasma of radio frequency discharge.

Die Druckverbreiterung der Balmer-Linien und der diffusen Linien des Heliums

1964 ◽  
Vol 19 (7-8) ◽  
pp. 947-967
Author(s):  
Carl-Rudolf Vidal
Keyword(s):  
Radio Frequency ◽  
Electron Density ◽  
Coulomb Interaction ◽  
High Accuracy ◽  
Line Profiles ◽  
Electron Densities ◽  
Sufficient Energy ◽  
Balmer Lines ◽  
Radio Frequency Discharge ◽  
Better Than

By means of a stationary radio frequency discharge producing homogeneous plasmas of hydrogen (Ne =1,4 ·1013 cm -3, Te = 1850 °K) and helium (Ne = 2,7·1013 cm-3, Te = 1850°K) , line profiles are measured photoelectrically with high accuracy. With sufficient energy, differences in intensity of more than 3 decades can be recorded. Profiles calculated on the basis of a quasistatic theory taking into account the mutual COULOMB interaction of the particles agree better than 5% with the measured, exclusively pressure broadened, BALMER lines, H8 to H15 . The electron densities determined from the H10 to H14 line differ by not more than 1%.Line profiles of the diffuse series of helium, including the “forbidden” components, have been measured. It turns out that the intensity in the wing of the triplett lines is proportional to Δv-2,5 and in the wing of the first singulett lines is proportional to Δν –2.0. The profiles of the triplett lines have been used to determine the electron density. These densities agree with those obtained from the merging of the last decernable lines.

Electron density modification in ionospheric E layer by inserting fine dust particles

2015 ◽  
Vol 22 (2) ◽  
pp. 023706 ◽  
Author(s):  
Shikha Misra ◽  
S. K. Mishra
Keyword(s):  
Electron Density ◽  
Dust Particles ◽  
Fine Dust

Characteristics of Vertical Spatial Distribution of Dust Particles in Radio Frequency-Plasma Sheath

2020 ◽  
Vol 48 (5) ◽  
pp. 1283-1289
Author(s):  
Zhao-Yang Chen ◽  
Xuan-Yue Song ◽  
Yang Liu ◽  
Han-Yu Tang ◽  
Xu Zhu ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Radio Frequency ◽  
Plasma Sheath ◽  
Dust Particles ◽  
Radio Frequency Plasma ◽  
Frequency Plasma
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