Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay

Albright, B. J.; Yin, L.; Bowers, K. J.; Bergen, B.

doi:10.1063/1.4943102

Title: Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay

Abstract

Two- and three-dimensional particle-in-cell simulations of stimulated Brillouin scattering(SBS) in laser speckle geometry have been analyzed to evaluate the relative importance of competing nonlinear processes in the evolution and saturation of SBS. It is found that ion-trapping-induced wavefront bowing and breakup of ion acoustic waves(IAW) and the associated side-loss of trapped ions dominate electron-trapping-induced IAW wavefront bowing and breakup, as well as the two-ion-wave decay instability over a range of ZT_e/T_i conditions and incident laser intensities. In the simulations, the latter instability does not govern the nonlinear saturation of SBS; however, evidence of two-ion-wave decay is seen, appearing as a modulation of the ion acoustic wavefronts. This modulation is periodic in the laser polarization plane, anti-symmetric across the speckle axis, and of a wavenumber matching that of the incident laser pulse. Furthermore, a simple analytic model is provided for how spatial “imprinting” from a high frequency inhomogeneity (in this case, the density modulation from the laser) in an unstable system with continuum eigenmodes can selectively amplify modes with wavenumbers that match that of the inhomogeneity.

Authors:: Albright, B. J.; Yin, L.; Bowers, K. J.; Bergen, B.

Publication Date:: Tue Mar 01 00:00:00 EST 2016

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1240307

Alternate Identifier(s):: OSTI ID: 1258443; OSTI ID: 1349319

Report Number(s):: LA-UR-15-27332
Journal ID: ISSN 1070-664X

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Published Article

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Name: Physics of Plasmas Journal Volume: 23 Journal Issue: 3; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; laser plasma instability; VPIC; stimulated Brillouin scattering; electrostatic waves; speckle; polarization; nonlinear dynamics

Citation Formats


                    Albright, B. J., Yin, L., Bowers, K. J., and Bergen, B. Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay.  United States: N. p., 2016. 
Web.  doi:10.1063/1.4943102.

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                    Albright, B. J., Yin, L., Bowers, K. J., & Bergen, B. Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay.  United States.  https://doi.org/10.1063/1.4943102

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                    Albright, B. J., Yin, L., Bowers, K. J., and Bergen, B. Tue .  
"Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay".  United States.  https://doi.org/10.1063/1.4943102.

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@article{osti_1240307,

  title        = {Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay},

  author       = {Albright, B. J. and Yin, L. and Bowers, K. J. and Bergen, B.},

  abstractNote = {Two- and three-dimensional particle-in-cell simulations of stimulated Brillouin scattering(SBS) in laser speckle geometry have been analyzed to evaluate the relative importance of competing nonlinear processes in the evolution and saturation of SBS. It is found that ion-trapping-induced wavefront bowing and breakup of ion acoustic waves(IAW) and the associated side-loss of trapped ions dominate electron-trapping-induced IAW wavefront bowing and breakup, as well as the two-ion-wave decay instability over a range of ZTe/Ti conditions and incident laser intensities. In the simulations, the latter instability does not govern the nonlinear saturation of SBS; however, evidence of two-ion-wave decay is seen, appearing as a modulation of the ion acoustic wavefronts. This modulation is periodic in the laser polarization plane, anti-symmetric across the speckle axis, and of a wavenumber matching that of the incident laser pulse. Furthermore, a simple analytic model is provided for how spatial “imprinting” from a high frequency inhomogeneity (in this case, the density modulation from the laser) in an unstable system with continuum eigenmodes can selectively amplify modes with wavenumbers that match that of the inhomogeneity.},

  doi          = {10.1063/1.4943102},

  journal      = {Physics of Plasmas},

  number       = 3,

  volume       = 23,

  place        = {United States},

  year         = {Tue Mar 01 00:00:00 EST 2016},

  month        = {Tue Mar 01 00:00:00 EST 2016}

}

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Title: Multi-dimensional dynamics of stimulated Brillouin scattering in a laser speckle: Ion acoustic wave bowing, breakup, and laser-seeded two-ion-wave decay

Abstract

Citation Formats

Energy transfer between crossing laser beams journal, January 1996

Observation of multiple mechanisms for stimulating ion waves in ignition scale plasmas journal, May 1997

Resonantly excited nonlinear ion waves journal, April 1997

Resonant stimulated Brillouin interaction of opposed laser beams in a drifting plasma journal, September 1998

Stimulated Brillouin scattering in the saturated regime journal, May 2003

Modeling the nonlinear saturation of stimulated Brillouin backscatter in laser heated plasmas journal, May 2003

Saturation of stimulated Brillouin backscattering in two-dimensional kinetic ion simulations journal, May 2005

Experimental observation and suppression of transverse stimulated Brillouin scattering in large optical components journal, January 1989

National Ignition Facility laser performance status journal, January 2007

Random Phasing of High-Power Lasers for Uniform Target Acceleration and Plasma-Instability Suppression journal, September 1984

Backscatter Reduction Using Combined Spatial, Temporal, and Polarization Beam Smoothing in a Long-Scale-length Laser Plasma journal, March 2001

Ultrahigh performance three-dimensional electromagnetic relativistic kinetic plasma simulation journal, May 2008

Advances in petascale kinetic plasma simulation with VPIC and Roadrunner journal, July 2009

Saturation of Backward Stimulated Scattering of a Laser Beam in the Kinetic Regime journal, December 2007

New insights into the decay of ion waves to turbulence, ion heating, and soliton generation journal, April 2014

Kinetic Effects on the Ion Sound Waves Generated by Stimulated Brillouin Scattering of a Spatially Smoothed Laser Beam journal, January 2000

Electron and ion kinetic effects on non-linearly driven electron plasma and ion acoustic waves journal, March 2013

TRIDENT high-energy-density facility experimental capabilities and diagnostics journal, October 2008

Optimal control of laser plasma instabilities using Spike Trains of Uneven Duration and Delay (STUD pulses) for ICF and IFE journal, January 2013

Simulations of drastically reduced SBS with laser pulses composed of a Spike Train of Uneven Duration and Delay (STUD pulses) journal, January 2013

Control of Stimulated Raman Scattering in the Strongly Nonlinear and Kinetic Regime Using Spike Trains of Uneven Duration and Delay journal, July 2014

Stimulated scattering in laser driven fusion and high energy density physics experiments journal, September 2014

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Trapping induced nonlinear behavior of backward stimulated Raman scattering in multi-speckled laser beams journal, May 2012

Numerical absorbing boundary conditions for the wave equation journal, September 1987

A method for incorporating Gauss' law into electromagnetic PIC codes journal, January 1987

Self-Organized Bursts of Coherent Stimulated Raman Scattering and Hot Electron Transport in Speckled Laser Plasma Media journal, June 2012

Energy transfer between crossing laser beams
journal, January 1996

Observation of multiple mechanisms for stimulating ion waves in ignition scale plasmas
journal, May 1997

Resonantly excited nonlinear ion waves
journal, April 1997

Resonant stimulated Brillouin interaction of opposed laser beams in a drifting plasma
journal, September 1998

Stimulated Brillouin scattering in the saturated regime
journal, May 2003

Modeling the nonlinear saturation of stimulated Brillouin backscatter in laser heated plasmas
journal, May 2003

Saturation of stimulated Brillouin backscattering in two-dimensional kinetic ion simulations
journal, May 2005

Experimental observation and suppression of transverse stimulated Brillouin scattering in large optical components
journal, January 1989

National Ignition Facility laser performance status
journal, January 2007

Random Phasing of High-Power Lasers for Uniform Target Acceleration and Plasma-Instability Suppression
journal, September 1984

Backscatter Reduction Using Combined Spatial, Temporal, and Polarization Beam Smoothing in a Long-Scale-length Laser Plasma
journal, March 2001

Ultrahigh performance three-dimensional electromagnetic relativistic kinetic plasma simulation
journal, May 2008

Advances in petascale kinetic plasma simulation with VPIC and Roadrunner
journal, July 2009

Saturation of Backward Stimulated Scattering of a Laser Beam in the Kinetic Regime
journal, December 2007

New insights into the decay of ion waves to turbulence, ion heating, and soliton generation
journal, April 2014

Kinetic Effects on the Ion Sound Waves Generated by Stimulated Brillouin Scattering of a Spatially Smoothed Laser Beam
journal, January 2000

Electron and ion kinetic effects on non-linearly driven electron plasma and ion acoustic waves
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journal, October 2008

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