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Title: Modeling Laser-Plasma Interaction over a Suite of NIF Experiments

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1366908
Report Number(s):
LLNL-CONF-732648
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Anomalous Absorption, Florence, OR, United States, Jun 11 - Jun 17, 2017
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION

Citation Formats

Strozzi, D J, Berger, R L, Jones, O S, Chapman, T, Divol, L, MacLaren, S A, Michel, P, and Divol, L. Modeling Laser-Plasma Interaction over a Suite of NIF Experiments. United States: N. p., 2017. Web.
Strozzi, D J, Berger, R L, Jones, O S, Chapman, T, Divol, L, MacLaren, S A, Michel, P, & Divol, L. Modeling Laser-Plasma Interaction over a Suite of NIF Experiments. United States.
Strozzi, D J, Berger, R L, Jones, O S, Chapman, T, Divol, L, MacLaren, S A, Michel, P, and Divol, L. 2017. "Modeling Laser-Plasma Interaction over a Suite of NIF Experiments". United States. doi:. https://www.osti.gov/servlets/purl/1366908.
@article{osti_1366908,
title = {Modeling Laser-Plasma Interaction over a Suite of NIF Experiments},
author = {Strozzi, D J and Berger, R L and Jones, O S and Chapman, T and Divol, L and MacLaren, S A and Michel, P and Divol, L},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 6
}

Conference:
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  • The effect of laser wavelength on laser-plasma coupling is one of the critical issues facing the laser driven inertial confinement community. The advantages of using lasers with output wavelength less than 1 ..mu..m, such as enhanced absorption and hydrodynamic efficiency, reduction in parametric instabilities and corresponding suprathermal electron generation, have long been predicted theoretically.
  • Experiments at all three wavelengths included the following: target absorption, stimulated Brillouin scattering, suprathermal electron production, observation of harmonic and half harmonic emission from the plasma as a signature of parametric processes such as 2..omega../sub pe/ and simulated Raman scattering. These experiments are presented and compared with detailed hydro code and plasma simulation results.
  • This paper discusses a series of laser fusion microimplosions and laser plasma interaction experiments performed with the Lawrence Livermore Laboratory's two beam 1.06 ..mu.. Nd:glass laser systems. Energies of 40 J in 80 psec (FWHM) have been focused on laser fusion targets producing intensities in excess of 10/sup 15/ W/cm/sup 2/. The targets were deuterium tritium (DT) filled thin walled (0.4 to 0.8 ..mu..) glass microshells of 40 to 100 ..mu.. diameter. These targets operated in what is commonly called the exploding pusher mode. The electron thermal wave propagates supersonically through the glass shell surrounding the DT gas which explodesmore » and consequently also implodes and compresses and heats the DT gas to thermonuclear conditions. Although the final states of microimplosion approaches an adiabatic compression, the process as a whole is severely nonisentropic. This is in contrast to the high density nearly isentropic implosion target designs of future experiments. With present laser outputs in the 100 J, 100 psec range, the exploding pusher target offers the possibility of doing the low yield laser driven thermonuclear implosion experiments. In addition, it provides a simple experimental condition to serve as a testbed for computer simulation code development, experimental confirmation (or not) of theoretical predictions in high power laser plasma interaction physics and diagnostic equipment development.« less