DISPERSION CHARACTERISTICS OF PLASMA WAVE-PACKETS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-559-C7-560
Author(s):  
R. J. Vidmar ◽  
F. W. Crawford
Keyword(s):  
Plasma Wave ◽  
Wave Packets ◽  
Dispersion Characteristics

Propagation and Damping of Nonlinear Plasma Wave Packets

2009 ◽  
Vol 102 (24) ◽  
Author(s):  
J. E. Fahlen ◽  
B. J. Winjum ◽  
T. Grismayer ◽  
W. B. Mori
Keyword(s):  
Plasma Wave ◽  
Wave Packets ◽  
Nonlinear Plasma ◽  
Nonlinear Plasma Wave

Dispersion characteristics of anisotropic unmagnetized ultra-relativistic transverse plasma wave with arbitrary electron degeneracy

2018 ◽  
Vol 25 (3) ◽  
pp. 032106 ◽  
Author(s):  
M. Sarfraz ◽  
H. Farooq ◽  
G. Abbas ◽  
S. Noureen ◽  
Z. Iqbal ◽  
...  
Keyword(s):  
Plasma Wave ◽  
Dispersion Characteristics

Dispersion Characteristics of the Dipolar Modes in a Wave Guide Partially Filled with a Magnetoplasma Column

1975 ◽  
Vol 53 (12) ◽  
pp. 1163-1178 ◽  
Author(s):  
G. L. Yip ◽  
S. Le-Ngoc
Keyword(s):  
Plasma Wave ◽  
Electromagnetic Wave Propagation ◽  
Axial Magnetic Field ◽  
Propagation Constant ◽  
Wave Guide ◽  
Dispersion Characteristics ◽  
Resonant Frequencies ◽  
Special Cases ◽  
Close Study ◽  
Asymptotic Dispersion

The electromagnetic wave propagation in a partially filled plasma wave guide is studied by using both the quasistatic and the exact analyses. The cutoff and resonant frequencies are examined analytically to predict all possible modes, and numerical methods are then used to study the complete dispersion characteristics. Because of the geometrical generality of the problem, the fully filled plasma wave guide and the plasma column in free space can be considered as special cases. The classifications of the modes existing in various regions are clarified. The effect of the ratio of the plasma and wave guide radii and the d.c. axial magnetic field on the modes is observed and discussed. With a close study of cutoffs, it is shown that the 'special unpaired mode,' named by Bevc, can now be paired with another mode in the gyroresonance region. For large values of the propagation constant, asymptotic dispersion equations can be derived and turn out to be the same in both analyses. Comparisons between the two sets of results are also made to examine the validity of the quasistatic analysis.

Monte Carlo Algorithms for Moments of Transition Arrays

1988 ◽  
Vol 102 ◽  
pp. 79-81
Author(s):  
A. Goldberg ◽  
S.D. Bloom
Keyword(s):  
Monte Carlo ◽  
State Vector ◽  
Basis Vector ◽  
Collective State ◽  
Dispersion Characteristics ◽  
Dipole Strength ◽  
The Third ◽  
Monte Carlo Algorithms ◽  
Third Moment ◽  
Very High

AbstractClosed expressions for the first, second, and (in some cases) the third moment of atomic transition arrays now exist. Recently a method has been developed for getting to very high moments (up to the 12th and beyond) in cases where a “collective” state-vector (i.e. a state-vector containing the entire electric dipole strength) can be created from each eigenstate in the parent configuration. Both of these approaches give exact results. Herein we describe astatistical(or Monte Carlo) approach which requires onlyonerepresentative state-vector |RV> for the entire parent manifold to get estimates of transition moments of high order. The representation is achieved through the random amplitudes associated with each basis vector making up |RV>. This also gives rise to the dispersion characterizing the method, which has been applied to a system (in the M shell) with≈250,000 lines where we have calculated up to the 5th moment. It turns out that the dispersion in the moments decreases with the size of the manifold, making its application to very big systems statistically advantageous. A discussion of the method and these dispersion characteristics will be presented.

Interferometric (Fourier-Spectroscopic) Measurement of Electron Energy Distributions

1990 ◽  
Vol 48 (2) ◽  
pp. 110-111 ◽  
Author(s):  
F. Hasselbach ◽  
A. Schäfer
Keyword(s):  
Group Velocity ◽  
Wave Packets ◽  
Index Of Refraction ◽  
Electron Wave ◽  
Fringe Contrast ◽  
Faraday Cage ◽  
Optical Index ◽  
Wien Filter ◽  
Coherent Wave ◽  
Electric And Magnetic Fields

Möllenstedt and Wohland proposed in 1980 two methods for measuring the coherence lengths of electron wave packets interferometrically by observing interference fringe contrast in dependence on the longitudinal shift of the wave packets. In both cases an electron beam is split by an electron optical biprism into two coherent wave packets, and subsequently both packets travel part of their way to the interference plane in regions of different electric potential, either in a Faraday cage (Fig. 1a) or in a Wien filter (crossed electric and magnetic fields, Fig. 1b). In the Faraday cage the phase and group velocity of the upper beam (Fig.1a) is retarded or accelerated according to the cage potential. In the Wien filter the group velocity of both beams varies with its excitation while the phase velocity remains unchanged. The phase of the electron wave is not affected at all in the compensated state of the Wien filter since the electron optical index of refraction in this state equals 1 inside and outside of the Wien filter.

Thermal self-action of acoustic wave packets in a liquid

1995 ◽  
Vol 165 (10) ◽  
pp. 1145 ◽  
Author(s):  
F.V. Bunkin ◽  
Gennadii A. Lyakhov ◽  
K.F. Shipilov
Keyword(s):  
Acoustic Wave ◽  
Wave Packets
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