scholarly journals Geometric perturbation theory and plasma physics

1985 ◽  
Author(s):  
S.M. Omohundro
Keyword(s):  
Perturbation Theory ◽  
Plasma Physics

Generalization of the perturbation theory by using a repeating equation: A case that reveals the plasma chaotic state

2012 ◽  
Vol 79 (2) ◽  
pp. 221-231 ◽  
Author(s):  
C. L. XAPLANTERIS ◽  
E. D. FILIPPAKI ◽  
L. C. XAPLANTERIS
Keyword(s):  
Perturbation Theory ◽  
Plasma Physics ◽  
Drift Velocity ◽  
Chaotic Behavior ◽  
Initial Conditions ◽  
Chaotic State ◽  
Plasma Parameters ◽  
Mathematical Solution ◽  
The Waves ◽  
Small Disturbances

AbstractAmong the theoretical and experimental situations of interest in plasma physics are the waves that rise into the plasma and are strongly affected from the plasma parameters. Therefore, the development of strong relations between unperturbed and perturbed quantities is proved to exist both experimentally and theoretically. In the present paper, the mathematical solution ended in a relation between drift and perturbed velocities, which presupposes the perturbed velocity value to be very small in comparison with the drift velocity. However, the experiment has shown that the presupposition of the small value of the perturbations is not satisfied in many laboratory instances; as a result the use of the perturbation theory is limited. To surpass this difficulty, the big perturbed quantity was divided into small and equal parts, and by using the equation between unperturbed and perturbed velocities as a repeating relation, the perturbed theory may be extended and generalized beyond the small disturbances. In addition, calculations with a little change in the initial conditions were carried out, to determine when the plasma obtains chaotic behavior.

A Perturbation Theory for the Population of Atomic Energy Levels in Non-Lte Plasmas

1988 ◽  
Vol 102 ◽  
pp. 343-347
Author(s):  
M. Klapisch
Keyword(s):  
Perturbation Theory ◽  
Small Parameter ◽  
Classification Scheme ◽  
Sum Rules ◽  
Energy Levels ◽  
Natural Classification ◽  
Quantum Numbers ◽  
Formal Expansion ◽  
Atomic Energy Levels ◽  
As Effects

AbstractA formal expansion of the CRM in powers of a small parameter is presented. The terms of the expansion are products of matrices. Inverses are interpreted as effects of cascades.It will be shown that this allows for the separation of the different contributions to the populations, thus providing a natural classification scheme for processes involving atoms in plasmas. Sum rules can be formulated, allowing the population of the levels, in some simple cases, to be related in a transparent way to the quantum numbers.

STREAK IMAGE CAMERA "AGAT" WITH PICOSECOND TIME RESOLUTION USED FOR INVESTIGATIONS IN PLASMA PHYSICS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-875-C7-876
Author(s):  
V. I. Averin ◽  
O. M. Brekhov ◽  
B. S. Gorbenko ◽  
A. F. Klepov ◽  
G. V. Kolesov ◽  
...  
Keyword(s):  
Plasma Physics ◽  
Time Resolution ◽  
Streak Image ◽  
Image Camera

Energy, Information, and Superluminal Speed in Quantum Electrodynamics

2020 ◽  
pp. 27-33
Author(s):  
Boris A. Veklenko
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Quantum Electrodynamics ◽  
Excited Atom ◽  
Standard Quantum ◽  
Energy Information

Without using the perturbation theory, the article demonstrates a possibility of superluminal information-carrying signals in standard quantum electrodynamics using the example of scattering of quantum electromagnetic field by an excited atom.

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