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:
-
- Univ. of Rochester, Rochester, NY (United States)
- Publication Date:
- Research Org.:
- Univ. of Rochester, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- OSTI Identifier:
- 1466015
- Alternate Identifier(s):
- OSTI ID: 1361881
- Grant/Contract Number:
- FC02-04ER54789
- Resource Type:
- 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. https://doi.org/10.1063/1.4983143
Li, J., Yan, R., and Ren, Chuang. Wed .
"Density modulation-induced absolute laser-plasma-instabilities: Simulations and theory". United States. https://doi.org/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}
}
Web of Science
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Works referencing / citing this record:
Transition from two-plasmon decay to stimulated Raman scattering under ignition conditions
journal, November 2019
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