Onset and saturation of backward stimulated Raman scattering of laser in trapping regime in three spatial dimensions

A suite of three-dimensional (3D) VPIC [K. J. Bowers et al., Phys. Plasmas 15, 055703 (2008)] particle-in-cell simulations of backward stimulated Raman scattering (SRS) in inertial confinement fusion hohlraum plasma has been performed on the heterogeneous multicore supercomputer, Roadrunner, presently the world’s most powerful supercomputer. These calculations reveal the complex nonlinear behavior of SRS and point to a new era of “at scale” 3D modeling of SRS in solitary and multiple laser speckles. The physics governing nonlinear saturation of SRS in a laser speckle in 3D is consistent with that of prior two-dimensional (2D) studies [L. Yin et al., Phys. Rev. Lett. 99, 265004 (2007)], but with important differences arising from enhanced diffraction and side loss in 3D compared with 2D. In addition to wave front bowing of electron plasma waves (EPWs) due to trapped electron nonlinear frequency shift and amplitude-dependent damping, we find for the first time that EPW self-focusing, which evolved from trap...

[1]  Kunioki Mima,et al.  Random Phasing of High-Power Lasers for Uniform Target Acceleration and Plasma-Instability Suppression , 1984 .

[2]  J. A. Paisner,et al.  The National Ignition Facility Project , 1994 .

[3]  William Daughton,et al.  Saturation of backward stimulated scattering of laser in kinetic regime: Wavefront bowing, trapped particle modulational instability, and trapped particle self-focusing of plasma waves , 2008 .

[4]  K. Bowers,et al.  Ultrahigh performance three-dimensional electromagnetic relativistic kinetic plasma simulationa) , 2008 .

[5]  D. Russell,et al.  Observation of stimulated electron-acoustic-wave scattering. , 2001, Physical review letters.

[6]  L. Yin,et al.  Nonlinear spectral signatures and spatiotemporal behavior of stimulated Raman scattering from single laser speckles. , 2005, Physical review letters.

[7]  L. Divol,et al.  Near-threshold reflectivity fluctuations in the independent-convective-hot-spot-model limit of a spatially smoothed laser beam. , 2002, Physical review letters.

[8]  D. S. Montgomery,et al.  Recent Trident single hot spot experiments: Evidence for kinetic effects, and observation of Langmuir decay instability cascade , 2002 .

[9]  K. Bowers,et al.  Saturation of backward stimulated scattering of a laser beam in the kinetic regime. , 2007, Physical review letters.

[10]  J. Lebowitz,et al.  Propagation Effects on the Breakdown of a Linear Amplifier Model: Complex-Mass Schrödinger Equation Driven by the Square of a Gaussian Field , 2005, math-ph/0505060.

[11]  B. Albright,et al.  Different kλD regimes for nonlinear effects on Langmuir wavesa) , 2006 .

[12]  R. Berger,et al.  Effect of plasma noise spectrum on stimulated scattering in inhomogeneous plasma , 1989 .

[13]  H. Rose.  Langmuir wave self-focusing versus decay instability , 2004, physics/0405015.

[14]  T. M. O'Neil,et al.  The Collisionless Damping of Nonlinear Plasma Oscillations. , 1965 .

[15]  B. Albright,et al.  Investigation of laser plasma instabilities using picosecond laser pulses , 2008 .

[16]  D. A. Callahan,et al.  Ray-based calculations of backscatter in laser fusion targets , 2008, 0806.0045.

[17]  L. Yin,et al.  Observation of a transition from fluid to kinetic nonlinearities for langmuir waves driven by stimulated Raman backscatter. , 2005, Physical review letters.

[18]  V. Tikhonchuk,et al.  Erratum: “SBS reflectivity from spatially smoothed laser beams: Random phase plates versus polarization smoothing” [Phys. Plasmas 5, 2706 (1998)] , 1998 .

[19]  B. Albright,et al.  Nonlinear development of stimulated Raman scattering from electrostatic modes excited by self-consistent non-Maxwellian velocity distributions. , 2006, Physical review. E, Statistical, nonlinear, and soft matter physics.

[20]  E. Valeo,et al.  Trapped-particle instability leading to bursting in stimulated Raman scattering simulations. , 2004, Physical review letters.

[21]  Josselin Garnier,et al.  Statistics of the hot spots of smoothed beams produced by random phase plates revisited , 1999 .

[22]  D. Strozzi,et al.  Kinetic enhancement of Raman backscatter, and electron acoustic Thomson scatter , 2006, physics/0610029.

[23]  C. Birdsall,et al.  Plasma Physics via Computer Simulation , 2018 .

[24]  Rose,et al.  Laser hot spots and the breakdown of linear instability theory with application to stimulated Brillouin scattering. , 1994, Physical review letters.

[25]  K. Bowers,et al.  Kinetic simulations of stimulated Raman and Brillouin scattering of Trident short-pulse laser in a single-hot-spot , 2008 .

[26]  William Daughton,et al.  Nonlinear backward stimulated Raman scattering from electron beam acoustic modes in the kinetic regime , 2006 .

[27]  A. B. Langdon,et al.  Filamentation and forward Brillouin scatter of entire smoothed and aberrated laser beams , 2000 .

[28]  T. M. O'Neil,et al.  Nonlinear Frequency Shift of an Electron Plasma Wave , 1972 .

[29]  A. B. Langdon,et al.  Analyses of laser-plasma interactions in National Ignition Facility ignition targetsa) , 2007 .

[30]  Joshua E. Rothenberg,et al.  Reduction of laser self-focusing in plasma by polarization smoothing , 1998 .

[31]  D. F. DuBois,et al.  Nonlinear saturation of stimulated Raman scattering in laser hot spots , 1999 .

[32]  Langmuir wave filamentation instability , 2007, 0710.3563.

[33]  A. B. Langdon,et al.  On the dominant and subdominant behavior of stimulated Raman and Brillouin scattering driven by nonuniform laser beams , 1998 .

[34]  Patricia J. Teller,et al.  Proceedings of the 2008 ACM/IEEE conference on Supercomputing , 2008, HiPC 2008.

[35]  K. Bowers,et al.  Particle-in-cell studies of laser-driven hot spots and a statistical model for mesoscopic properties of Raman backscatter , 2006 .

[36]  H. Rose,et al.  Statistical properties of laser hot spots produced by a random phase plate , 1993 .

[37]  William Daughton,et al.  Advances in petascale kinetic plasma simulation with VPIC and Roadrunner , 2009 .