Kinetic dispersion of Langmuir waves. I. The Langmuir decay instability

2009 ◽  
Vol 16 (9) ◽  
pp. 092304 ◽  
Author(s):  
J. P. Palastro ◽  
E. A. Williams ◽  
D. E. Hinkel ◽  
L. Divol ◽  
D. J. Strozzi
Keyword(s):  
Langmuir Waves ◽  
Decay Instability ◽  
Langmuir Decay

Time-resolved measurements of secondary Langmuir waves produced by the Langmuir decay instability in a laser-produced plasma

1998 ◽  
Vol 5 (1) ◽  
pp. 234-242 ◽  
Author(s):  
C. Labaune ◽  
H. A. Baldis ◽  
B. S. Bauer ◽  
V. T. Tikhonchuk ◽  
G. Laval
Keyword(s):  
Langmuir Waves ◽  
Time Resolved ◽  
Decay Instability ◽  
Laser Produced Plasma ◽  
Langmuir Decay ◽  
Time Resolved Measurements

First Observation of Ion Acoustic Waves Produced by the Langmuir Decay Instability

2000 ◽  
Vol 84 (13) ◽  
pp. 2869-2872 ◽  
Author(s):  
S. Depierreux ◽  
J. Fuchs ◽  
C. Labaune ◽  
A. Michard ◽  
H. A. Baldis ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Ion Acoustic Waves ◽  
Decay Instability ◽  
Ion Acoustic ◽  
Langmuir Decay

Observation of the Langmuir decay instability driven by stimulated Raman scattering

1997 ◽  
Vol 4 (8) ◽  
pp. 3012-3020 ◽  
Author(s):  
K. L. Baker ◽  
R. P. Drake ◽  
B. S. Bauer ◽  
K. G. Estabrook ◽  
A. M. Rubenchik ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Decay Instability ◽  
Langmuir Decay ◽  
Stimulated Raman

scholarly journals Raman–Brillouin interplay for inertial confinement fusion relevant laser–plasma interaction

2016 ◽  
Vol 4 ◽  
Author(s):  
C. Riconda ◽  
S. Weber
Keyword(s):  
Raman Scattering ◽  
Acoustic Waves ◽  
Inertial Confinement Fusion ◽  
Clear Correlation ◽  
Inertial Confinement ◽  
Decay Instability ◽  
Wide Range ◽  
Confinement Fusion ◽  
Parameter Ranges ◽  
Langmuir Decay

The co-existence of the Raman and Brillouin backscattering instability is an important issue for inertial confinement fusion. The present paper presents extensive one-dimensional (1D) particle-in-cell (PIC) simulations for a wide range of parameters extending and complementing previous findings. PIC simulations show that the scenario of reflectivity evolution and saturation is very sensitive to the temperatures, intensities, size of plasma and boundary conditions employed. The Langmuir decay instability is observed for rather small $k_{epw}{\it\lambda}_{D}$ but has no influence on the saturation of Brillouin backscattering, although there is a clear correlation of Langmuir decay instability modes and ion-fractional decay for certain parameter ranges. Raman backscattering appears at any intensity and temperature but is only a transient phenomenon. In several configurations forward as well as backward Raman scattering is observed. For the intensities considered, $I{\it\lambda}_{o}^{2}$ above $10^{15}~\text{W}~{\rm\mu}\text{m}^{2}/\text{cm}^{2}$ , Raman is always of bursty nature. A particular setup allows the simulation of multi-speckle aspects in which case it is found that Raman is self-limiting due to strong modifications of the distribution function. Kinetic effects are of prime importance for Raman backscattering at high temperatures. No unique scenario for the saturation of Raman scattering or Raman–Brillouin competition does exist. The main effect in the considered parameter range is pump depletion because of large Brillouin backscattering. However, in the low $k_{epw}{\it\lambda}_{D}$ regime the presence of ion-acoustic waves due to the Langmuir decay instability from the Raman created electron plasma waves can seed the ion-fractional decay and affect the Brillouin saturation.

scholarly journals Electron Beams and Langmuir Turbulence in Solar Type III Radio Bursts Observed in the Interplanetary Medium

1990 ◽  
Vol 142 ◽  
pp. 467-481
Author(s):  
R. P. Lin
Keyword(s):  
Interplanetary Medium ◽  
Electron Beams ◽  
Low Frequency ◽  
Langmuir Wave ◽  
Plasma Waves ◽  
Wave Number ◽  
Langmuir Waves ◽  
Decay Instability ◽  
Type Iii ◽  
Solar Type

The ISEE-3 spacecraft has provided in situ observations of electron beams, plasma waves, and associated solar type III radio emission in the interplanetary medium near 1 AU. These observations show that electron beams are formed by the faster electrons arriving before the slower ones, following an impulsive injection at the Sun. The resulting bump-on-tail in the reduced one-dimensional distribution function, f(v||), is unstable to the growth of electrostatic electron plasma (Langmuir) waves. The Langmuir waves are observed to be highly impulsive in nature. The onset and temporal variations of the observed plasma waves are in good qualitative agreement with the wave growth expected from the evolution of measured f(v||). However, far higher Langmuir wave intensities are predicted than are detected. In addition, the lack of obvious plateauing of the bump-on-tail suggests that the waves have been removed from resonance with the beam electrons by some wave-wave interaction. Bursts of low frequency, 30–300 Hz (in the spacecraft frame) waves are often found coincident in time with the most intense spikes of the Langmuir waves. These low-frequency waves appear to be long-wavelength ion acoustic waves, with wave number approximately equal to the beam-resonant Langmuir wave number. The observations suggest several possible interpretations: modulational instability, electrostatic decay instability, and electromagnetic decay instability; but none of these are fully consistent with the observations. Microstructures, too short in duration to be resolved by present experiments, have been invoked as an explanation of the phenomenon. Experiments are currently being developed to study these processes using fast wave-particle correlation techniques.

Sign in / Sign up

Export Citation Format

Share Document