Experimental determination of temperature-dependent electron-electron collision frequency in isochorically heated warm dense gold

2014 ◽  
Vol 89 (16) ◽  
Author(s):  
C. Fourment ◽  
F. Deneuville ◽  
D. Descamps ◽  
F. Dorchies ◽  
S. Petit ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Collision Frequency ◽  
Electron Collision ◽  
Temperature Dependent ◽  
Electron Collision Frequency ◽  
Isochorically Heated

Über ein Verfahren zur gleichzeitigen Bestimmung von Elektronenkonzentration und Elektronenstoßzahl in einem homogenen isotropen oder in einem langsam veränderlichen Plasma

1970 ◽  
Vol 25 (1) ◽  
pp. 106-114
Author(s):  
W. Muschler
Keyword(s):  
Refractive Index ◽  
Electron Concentration ◽  
Collision Frequency ◽  
Complex Refractive Index ◽  
Electron Collision ◽  
Height Range ◽  
Reflected Waves ◽  
Electron Collision Frequency ◽  
D Region

Abstract A method is described, which allows determination of the complex refractive index of a plasma by separate measurement of the E-and H-component of an electromagnetic wave. By means of the complex refractive index simultaneously electron concentration and electron collision frequency of the medium can be stated.The measuring frequency depends upon absorption, precision requirements, and - for a locally varying medium - upon the availability range of theory used.General considerations are applied to a plasma model (terrestrial ionosphere without magnetic field): Simultaneous measurement of electron concentration and electron collision frequency should be well possible within a height range corresponding to the terrestrial D-region. In higher regions determination of the (decreasing) electron collision frequency becomes more and more difficult, whereas possibilities for determination of the (increasing) electron concentration seem to improve.The influence of reflected waves is considered in a following paper 4.

Gleichzeitige Bestimmung von Elektronenkonzentration und Elektronenstoßzahl in einem örtlich langsam veränderlichen Magnetoplasma (Teil II) / Simultaneous Determination of Electron Concentration and Electron Collision Frequency in a Locally Slowly Varying Magnetoplasma (II)

1974 ◽  
Vol 29 (1) ◽  
pp. 75-83
Author(s):  
W. Muschler
Keyword(s):  
Simultaneous Determination ◽  
Electron Concentration ◽  
Collision Frequency ◽  
Preceding Paper ◽  
Numerical Calculations ◽  
Electron Collision ◽  
Plasma Model ◽  
Electron Collision Frequency ◽  
Coupled Wave Equations

A preceding paper was concerned with the principles of a wave propagation experiment. These appeared suitable for a simultaneous determination of electron concentration Ne and of electron collision frequency v in a magnetoplasma. They considered measurements of the refractive index n and of wave polarization ϱ, both of which being determined by field strength ratios. In this paper supplementary numerical calculations are carried out using a plasma model that corresponds to conditions observable in the earth’s lower day time ionosphere and that is characterized by exclusively positive gradients of Ne . Furthermore, a modification of the original principle is discussed renouncing measurements of n and using only those of ϱ. Numerical calculations on error propagation demonstrate a significant superiority of the modified version. WKB solutions of coupled wave equations are used. As the plasma model includes local variations of the plasma parameters, the theory can be applied only to limited height and frequency intervals. These are deduced from the coupling parameter Ψ.

scholarly journals Bestimmung des komplexen Brechungsindex eines Plasmas mittels des Ausbreitungsverfahrens beim Auftreten reflektierter Wellen

1970 ◽  
Vol 25 (4) ◽  
pp. 482-487
Author(s):  
W. Muschler
Keyword(s):  
Refractive Index ◽  
Wave Propagation ◽  
Simultaneous Determination ◽  
Electron Concentration ◽  
Collision Frequency ◽  
Complex Refractive Index ◽  
Preceding Paper ◽  
Electron Collision ◽  
Electron Collision Frequency

Abstract In a preceding paper a propagation method has been described that allows simultaneous determination of electron concentration and electron collision frequency in a slowly varying plasma - using its complex refractive index. A regular progressive damped wave had been assumed. In this paper the treatment is extended to the case that the original wave is superimposed by a reflected one. The calculations show that for distinct points in the direction of wave propagation the determination of both modulus and argument of the complex refractive index is again possible. The discrete sequence of measuring points does not restrict the local resolution of the method.

Effects of temperature and electron collision frequency on the elastic electron–ion collisions in a collisional plasma

2013 ◽  
Vol 79 (5) ◽  
pp. 553-558 ◽  
Author(s):  
YOUNG-DAE JUNG ◽  
WOO-PYO HONG
Keyword(s):  
Phase Shift ◽  
Temperature Effect ◽  
Cross Section ◽  
Collision Frequency ◽  
Electron Collision ◽  
Elastic Electron ◽  
Dynamic Temperature ◽  
Electron Collision Frequency ◽  
Dynamic Screening ◽  
Ion Collision

AbstractThe effects of dynamic temperature and electron–electron collisions on the elastic electron–ion collision are investigated in a collisional plasma. The second-order eikonal analysis and the velocity-dependent screening length are employed to derive the eikonal phase shift and eikonal cross section as functions of collision energy, electron collision frequency, Debye length, impact parameter, and thermal energy. It is interesting to find out that the electron–electron collision effect would be vanished; however, the dynamic temperature effect is included in the first-order approximation. We have found that the dynamic temperature effect strongly enhances the eikonal phase shift as well as the eikonal cross section for electron–ion collision since the dynamic screening increases the effective shielding distance. In addition, the detailed characteristic behavior of the dynamic screening function is also discussed.

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