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

Published online by Cambridge University Press:  18 February 2009

J.L. Kline*
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
D.S. Montgomery
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
C. Rousseaux
Affiliation:
Commissariat à l'Energie Atomique, CEA, DAM, DIF, Arpajon, France
S.D. Baton
Affiliation:
LULI, UMR 7605, CNRS-CEA-Ecole Polytechnique-Université Paris VI, Ecole Polytechnique, Palaiseau, France
V. Tassin
Affiliation:
Commissariat à l'Energie Atomique, CEA, DAM, DIF, Arpajon, France
R.A. Hardin
Affiliation:
West Virginia University, Morgantown, West Virginia
K.A. Flippo
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
R.P. Johnson
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
T. Shimada
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
L. Yin
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
B.J. Albright
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
H.A. Rose
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico
F. Amiranoff
Affiliation:
LULI, UMR 7605, CNRS-CEA-Ecole Polytechnique-Université Paris VI, Ecole Polytechnique, Palaiseau, France
*
Address correspondence and reprint requests to: John Kline, P-24, Plasma Physics, MS: E526, Los Alamos National Laboratory, Los Alamos, NM 87545. E-mail: jkline@lanl.gov

Abstract

Short 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.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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