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Title: Density modulation-induced absolute laser-plasma-instabilities: Simulations and theory

Abstract

Fluid simulations show that when a sinusoidal density modulation is superimposed on a linear density profile, convective instabilities can become absolutely unstable. This conversion can occur for two-plasmon-decay and stimulated Raman Scattering instabilities under realistic direct-drive inertial confinement fusion conditions and can affect hot electron generation and laser energy deposition. Analysis of the three-wave model shows that a sufficiently large change of the density gradient in a linear density profile can turn convective instabilities into absolute ones. In conclusion, an analytical expression is given for the threshold of the gradient change for a two-slope density profile, which depends on the convective gain only.

Authors:
ORCiD logo [1];  [1];  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1466015
Alternate Identifier(s):
OSTI ID: 1361881
Grant/Contract Number:  
FC02-04ER54789
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Li, J., Yan, R., and Ren, Chuang. Density modulation-induced absolute laser-plasma-instabilities: Simulations and theory. United States: N. p., 2017. Web. doi:10.1063/1.4983143.
Li, J., Yan, R., & Ren, Chuang. Density modulation-induced absolute laser-plasma-instabilities: Simulations and theory. United States. doi:10.1063/1.4983143.
Li, J., Yan, R., and Ren, Chuang. Wed . "Density modulation-induced absolute laser-plasma-instabilities: Simulations and theory". United States. doi:10.1063/1.4983143. https://www.osti.gov/servlets/purl/1466015.
@article{osti_1466015,
title = {Density modulation-induced absolute laser-plasma-instabilities: Simulations and theory},
author = {Li, J. and Yan, R. and Ren, Chuang},
abstractNote = {Fluid simulations show that when a sinusoidal density modulation is superimposed on a linear density profile, convective instabilities can become absolutely unstable. This conversion can occur for two-plasmon-decay and stimulated Raman Scattering instabilities under realistic direct-drive inertial confinement fusion conditions and can affect hot electron generation and laser energy deposition. Analysis of the three-wave model shows that a sufficiently large change of the density gradient in a linear density profile can turn convective instabilities into absolute ones. In conclusion, an analytical expression is given for the threshold of the gradient change for a two-slope density profile, which depends on the convective gain only.},
doi = {10.1063/1.4983143},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Wed May 10 00:00:00 EDT 2017},
month = {Wed May 10 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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