A new method of determining the electron density and collision frequency in plasma†

1968 ◽  
Vol 24 (1) ◽  
pp. 79-87 ◽  
Author(s):  
G. K. BHAGAVAT ◽  
D. P. NANDEDKAR
Keyword(s):  
Electron Density ◽  
Collision Frequency ◽  
New Method

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.

Microwave Diagnostics of a Strong Arc Discharge Plasma in SF6

1975 ◽  
Vol 30 (8) ◽  
pp. 947-950 ◽  
Author(s):  
J. Musil ◽  
F. Žáček
Keyword(s):  
Electromagnetic Wave ◽  
Electron Density ◽  
Free Space ◽  
Discharge Plasma ◽  
Collision Frequency ◽  
Arc Discharge ◽  
Time Variable ◽  
Discharge Plasmas ◽  
Microwave Diagnostics ◽  
Basic Concepts

Abstract The paper deals with the microwave free-space diagnostics of high collision arc discharge plasmas. It is found that information about the electron density N and the collision frequency ν in such a plasma can be obtained from the energy transmitted through the plasma by an electromagnetic wave. The phase of the electromagnetic wave cannot be used since it is almost the same as that of a wave passing through vacuum. These basic concepts are verified experimentally at a frequency of 37.5 GHz. It is shown how the time dependence of the electron density in a plasma with constant and with time variable collision frequency may be evaluated.

scholarly journals Decay of the electron density and the electron collision frequency between successive discharges of a pulsed plasma jet in N2

2019 ◽  
Vol 28 (3) ◽  
pp. 035020 ◽  
Author(s):  
Marc van der Schans ◽  
Bart Platier ◽  
Peter Koelman ◽  
Ferdi van de Wetering ◽  
Jan van Dijk ◽  
...  
Keyword(s):  
Electron Density ◽  
Collision Frequency ◽  
Plasma Jet ◽  
Electron Collision ◽  
Pulsed Plasma ◽  
Electron Collision Frequency

The theory of the limiting polarization of radio waves reflected from the ionosphere

1952 ◽  
Vol 215 (1121) ◽  
pp. 215-233 ◽  
Keyword(s):  
Electron Density ◽  
Wave Equations ◽  
Collision Frequency ◽  
Coupling Parameter ◽  
Specific Model ◽  
Refractive Indices ◽  
Radio Waves ◽  
High Frequencies ◽  
Characteristic Wave ◽  
Coupled Wave Equations

In the theory of the propagation of radio waves through a homogeneous ionized medium it is well known that ‘characteristic’ waves, sometimes called the ‘ordinary’ and ‘extra ordinary’ waves, are propagated independently. The refractive index and polarization for each characteristic wave are given by the magneto-ionic theory (Appleton 1932). If the medium is slowly varying, Booker (1936) has shown that in many cases this theory may still be applied. But there are important cases where the characteristic waves are not independent, and there is then said to be ‘coupling’ between them. This paper discusses the coupling which occurs in the lower part of the ionosphere. Here there is a ‘limiting’ region where a downcoming characteristic wave acquires the limiting polarization observed at the ground. Booker (1936) gave an approximate specification for the level of the limiting region. This paper gives a more precise specification and develops a method for calculating the limiting polarization of a downcoming characteristic wave. The theory is based on Fӧrsterling’s (1942) coupled wave equations, which apply only to vertical incidence. They contain a coupling parameter, ѱ , which depends on the gradients of electron density and collision frequency. The level of the limiting region is specified in terms of ѱ and the refractive indices of the characteristic waves. The properties of a specific model of the ionosphere are discussed, and it is shown that for frequencies greater than about 1 Mc/s the limiting polarization is that given by the magneto-ionic theory for a certain ‘limiting point’ which occurs at a definite value of the height. This value may in general be complex, but in practical cases is almost purely real and occurs where the electron density and collision frequency are small, so that at high frequencies the limiting polarization is determined only by the magnitude and direction of the earth’s magnetic field in the ionosphere.

Electron Density and the Collision Frequency of a Periodically Varying Plasma Medium

1970 ◽  
Vol 16 (9) ◽  
pp. 685-689
Author(s):  
Avinash Chandra ◽  
Satyendra Kumar ◽  
D. C. Sarkar
Keyword(s):  
Electron Density ◽  
Collision Frequency ◽  
Plasma Medium
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