Maximization in the damping rate of the ion acoustic wave in a two-ion plasma

1975 ◽  
Vol 18 (6) ◽  
pp. 651 ◽  
Author(s):  
Masaharu Nakamura ◽  
Masataka Ito ◽  
Yoshiharu Nakamura ◽  
Tomizo Itoh
Keyword(s):  
Acoustic Wave ◽  
Ion Acoustic Wave ◽  
Ion Plasma ◽  
Ion Acoustic ◽  
Damping Rate

scholarly journals Ion Acoustic Peregrine Soliton Under Enhanced Dissipation

2021 ◽  
Vol 8 ◽  
Author(s):  
Pallabi Pathak
Keyword(s):  
Acoustic Wave ◽  
Negative Ions ◽  
Landau Damping ◽  
Ion Acoustic Wave ◽  
Multicomponent Plasma ◽  
Plasma Device ◽  
Ion Acoustic ◽  
Damping Rate ◽  
Double Plasma Device ◽  
Spatial Damping

The effect of enhanced Landau damping on the evolution of ion acoustic Peregrine soliton in multicomponent plasma with negative ions has been investigated. The experiment is performed in a multidipole double plasma device. To enhance the ion Landau damping, the temperature of the ions is increased by applying a continuous sinusoidal signal of frequency close to the ion plasma frequency ∼1 MHz to the separation grid. The spatial damping rate of the ion acoustic wave is measured by interferometry. The damping rate of ion acoustic wave increases with the increase in voltage of the applied signal. At a higher damping rate, the Peregrine soliton ceases to show its characteristics leaving behind a continuous envelope.

Decay Instability of the Ion Acoustic Wave

1975 ◽  
Vol 53 (6) ◽  
pp. 657-665
Author(s):  
S. R. Seshadri
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Pump Wave ◽  
Plasma Oscillation ◽  
Electron Plasma ◽  
Electromagnetic Mode ◽  
Ion Acoustic Wave ◽  
Plasma Mode ◽  
Ion Plasma ◽  
Ion Acoustic

The parametric excitation of the longitudinal, plasma mode and the transverse, electromagnetic mode in a warm, uniform plasma is investigated for the case in which the pump wave is another electromagnetic mode. The three interacting waves are assumed to propagate in the same direction. The longitudinal mode has two branches, namely, the electron plasma mode and the ion plasma mode. The parametric coupling of the longitudinal and the transverse waves in the presence of the pump wave leads to instabilities of the interacting waves. Illustrative numerical results are presented for the parametric instabilities of the electron plasma oscillation which is a part of the electron plasma mode and those of the ion acoustic waves and the ion plasma oscillations which are parts of the ion plasma mode. The ion acoustic wave is efficiently excited when the pump and the idler wave frequencies are approximately equal to one and a half times the electron plasma frequency.

Nonlinear ion acoustic wave in a pair-ion plasma in a uniform weak magnetic field

2015 ◽  
Vol 90 (4) ◽  
pp. 045604 ◽  
Author(s):  
Biplab Maity ◽  
Samiran Ghosh ◽  
R Bharuthram
Keyword(s):  
Magnetic Field ◽  
Acoustic Wave ◽  
Weak Magnetic Field ◽  
Ion Acoustic Wave ◽  
Ion Plasma ◽  
Ion Acoustic

Oblique Ion Acoustic Wave Instabilities in a Multi-Ion Plasma and3He-Rich Events

1993 ◽  
Vol 62 (8) ◽  
pp. 2545-2548 ◽  
Author(s):  
Tian Xi Zhang ◽  
Mieko Toida ◽  
Yukiharu Ohsawa
Keyword(s):  
Acoustic Wave ◽  
Ion Acoustic Wave ◽  
Ion Plasma ◽  
Ion Acoustic ◽  
Wave Instabilities

Theory of double resonance parametric excitation in plasmas. Part 2

1980 ◽  
Vol 24 (2) ◽  
pp. 315-340 ◽  
Author(s):  
Burton D. Fried ◽  
Allen Adler ◽  
Robert Bingham
Keyword(s):  
Acoustic Wave ◽  
Parametric Excitation ◽  
Double Resonance ◽  
Langmuir Wave ◽  
Frequency Separation ◽  
Wave Damping ◽  
Ion Acoustic Wave ◽  
Acoustic Frequency ◽  
Ion Acoustic ◽  
Damping Rate

Using a simpler formalism than in the original paper on this subject, we verify the earlier result that, for a pump frequency separation Δ approximately equal to twice the ion acoustic frequency Ω, the use of two long-wavelength pumps can reduce the threshold for parametric excitation of ion-acoustic waves when, and only when, the Langmuir wave damping rate γ is much larger than Ω. The threshold is then reduced by a factor of order Ω/Ω, the optimum value of t being ▵ 2Ω –Γ for equal pump amplitudes, where Γ is the ion-acoustic wave damping rate and Γ ≪ Ω. The analysis presented in a recent paper is shown to be valid only for γ ≪ Ω, where the threshold reduction is quite small, vanishing in the limit of weak ion-acoustic wave damping (Te/Ti≫ 1).

scholarly journals Ion-Acoustic Instabilities in a Multi-Ion Plasma

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Noble P. Abraham ◽  
Sijo Sebastian ◽  
G. Sreekala ◽  
R. Jayapal ◽  
C. P. Anilkumar ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Ion Acoustic Wave ◽  
Oxygen Ions ◽  
Ion Plasma ◽  
Thermal Spread ◽  
Ion Acoustic ◽  
Acoustic Instabilities ◽  
The Stability

We have, in this paper, studied the stability of the ion-acoustic wave in a plasma composed of hydrogen, positively and negatively charged oxygen ions, and electrons, which approximates very well the plasma environment around a comet. Modelling each cometary component (H+, O+, and O−) by a ring distribution, we find that ion-acoustic waves can be generated at frequencies comparable to the hydrogen ion plasma frequency. The dispersion relation has been solved both analytically and numerically. We find that the ratio of the ring speed (u⊥s) to the thermal spread (vts) modifies the dispersion characteristics of the ion-acoustic wave. The contrasting behaviour of the phase velocity of the ion-acoustic wave in the presence of O− ions for u⊥s>vts (and vice versa) can be used to detect the presence of negatively charged oxygen ions and also their thermalization.

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