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

Li, J.; Yan, R.; Ren, Chuang

doi:10.1063/1.4983143

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

Journal Article · Wed May 10 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4983143· OSTI ID:1466015

^[1]; Yan, R. ^[1]; Ren, Chuang ^[1]

Univ. of Rochester, Rochester, NY (United States)

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.

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Research Organization:: Univ. of Rochester, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FC02-04ER54789

OSTI ID:: 1466015

Alternate ID(s):: OSTI ID: 1361881

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Transition from two-plasmon decay to stimulated Raman scattering under ignition conditions Xiao, C. Z.; Zhuo, H. B.; Yin, Y. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab4e79	journal	November 2019

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