Thomson Scattering Measurements of the Langmuir Wave Spectra Resulting from Stimulated Raman Scattering

1996 ◽  
Vol 77 (1) ◽  
pp. 67-70 ◽  
Author(s):  
K. L. Baker ◽  
R. P. Drake ◽  
B. S. Bauer ◽  
K. G. Estabrook ◽  
A. M. Rubenchik ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Langmuir Wave ◽  
Thomson Scattering ◽  
Wave Spectra ◽  
Scattering Measurements ◽  
Stimulated Raman

Measurement of the frequency and spectral width of the Langmuir wave spectrum driven by stimulated Raman scattering

1999 ◽  
Vol 6 (11) ◽  
pp. 4284-4292 ◽  
Author(s):  
K. L. Baker ◽  
R. P. Drake ◽  
K. G. Estabrook ◽  
Brad Sleaford ◽  
M. K. Prasad ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Wave Spectrum ◽  
Langmuir Wave ◽  
Spectral Width ◽  
Stimulated Raman

scholarly journals Investigation of stimulated Raman scattering using a short-pulse diffraction limited laser beam near the instability threshold

2009 ◽  
Vol 27 (1) ◽  
pp. 185-190 ◽  
Author(s):  
J.L. Kline ◽  
D.S. Montgomery ◽  
C. Rousseaux ◽  
S.D. Baton ◽  
V. Tassin ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Laser Plasma ◽  
Stimulated Raman Scattering ◽  
Short Pulse ◽  
Electron Plasma ◽  
Thomson Scattering ◽  
Wave Number ◽  
Particle In Cell ◽  
Laser Facility ◽  
Stimulated Raman

AbstractShort pulse laser plasma interaction experiments using diffraction limited beams provide an excellent platform to investigate the fundamental physics of stimulated Raman scattering. Detailed understanding of these laser plasma instabilities impacts the current inertial confinement fusion ignition designs and could potentially impact fast ignition when higher energy lasers are used with longer pulse durations (>1 kJ and >1 ps). Using short laser pulses, experiments can be modeled over the entire interaction time of the laser using particle-in-cell codes to validate our understanding quantitatively. Experiments have been conducted at the Trident laser facility and the Laboratoire pour l'Utilisation des Lasers Intenses (LULI) to investigate stimulated Raman scattering near the threshold of the instability using 527 nm and 1059 nm laser light, respectively, with 1.5–3.0 ps pulses. In both experiments, the interaction beam was focused into pre-ionized helium gas-jet plasma. Measurements of the reflectivity as a function of intensity and kλD were completed at the Trident laser facility, where k is the electron plasma wave number and λD is the plasma Debye length. At LULI, a 300 fs Thomson scattering probe is used to directly measure the density fluctuations of the driven electron plasma and ion acoustic waves. Work is currently underway comparing the results of the experiments with simulations using the VPIC particle-in-cell code. Details of the experimental results are presented in this manuscript.

scholarly journals Absolute instability modes due to rescattering of stimulated Raman scattering in a large nonuniform plasma

2019 ◽  
Vol 7 ◽  
Author(s):  
Yao Zhao ◽  
Zhengming Sheng ◽  
Suming Weng ◽  
Shengzhe Ji ◽  
Jianqiang Zhu
Keyword(s):  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Langmuir Wave ◽  
Pump Light ◽  
Absolute Instability ◽  
Nonuniform Plasma ◽  
Instability Modes ◽  
The Absolute ◽  
Stimulated Raman

Absolute instability modes due to secondary scattering of stimulated Raman scattering (SRS) in a large nonuniform plasma are studied theoretically and numerically. The backscattered light of convective SRS can be considered as a pump light with a finite bandwidth. The different frequency components of the backscattered light can be coupled to develop absolute SRS instability near their quarter-critical densities via rescattering process. The absolute SRS mode develops a Langmuir wave with a high phase velocity of about $c/\sqrt{3}$ with $c$ the light speed in vacuum. Given that most electrons are at low velocities in the linear stage, the absolute SRS mode grows with very weak Landau damping. When the interaction evolves into the nonlinear regime, the Langmuir wave can heat abundant electrons up to a few hundred keV via the SRS rescattering. Our theoretical model is validated by particle-in-cell simulations. The absolute instabilities may play a considerable role in the experiments of inertial confinement fusion.

Stimulated Raman scattering measurements of V–V transfer in oxygen

2006 ◽  
Vol 323 (2-3) ◽  
pp. 532-544 ◽  
Author(s):  
Tai Ahn ◽  
Igor Adamovich ◽  
Walter R. Lempert
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Scattering Measurements ◽  
Stimulated Raman

Observation of plasma waves by Thomson scattering: Saturation of stimulated Raman scattering

1993 ◽  
Vol 71 (3) ◽  
pp. 368-371 ◽  
Author(s):  
D. M. Villeneuve ◽  
K. Baker ◽  
R. P. Drake ◽  
B. Sleaford ◽  
B. La Fontaine ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Plasma Waves ◽  
Thomson Scattering ◽  
Stimulated Raman
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