Journal ArticleDOI
Saturation of backward stimulated scattering of laser in kinetic regime: Wavefront bowing, trapped particle modulational instability, and trapped particle self-focusing of plasma waves
TLDR
In this paper, the backward stimulated Raman and Brillouin scattering (SRS and SBS) of laser is examined in the kinetic regime using particle-in-cell simulations and wavefront bowing of electron plasma waves due to the trapped particle nonlinear frequency shift, which increases with laser intensity, is observed in the SBS regime for the first time.Abstract:
Backward stimulated Raman and Brillouin scattering (SRS and SBS) of laser are examined in the kinetic regime using particle-in-cell simulations. The SRS reflectivity measured as a function of the laser intensity in a single hot spot from two-dimensional (2D) simulations shows a sharp onset at a threshold laser intensity and a saturated level at higher intensities, as obtained previously in Trident experiments [D. S. Montgomery et al., Phys. Plasmas 9, 2311 (2002)]. In these simulations, wavefront bowing of electron plasma waves (ion acoustic waves) due to the trapped particle nonlinear frequency shift, which increases with laser intensity, is observed in the SRS (SBS) regime for the first time. Self-focusing from trapped particle modulational instability (TPMI) [H. A. Rose, Phys. Plasmas 12, 12318 (2005)] is shown to occur in both two- and three-dimensional SRS simulations. The key physics underlying nonlinear saturation of SRS is identified as a combination of wavefront bowing, TPMI, and self-focusing of...read more
Citations
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Journal ArticleDOI
Raman Techniques: Fundamentals and Frontiers
TL;DR: An understanding of the fundamental physics that govern the Raman effect and its advantages, limitations and applications is provided and the key experimental considerations for implementing the main experimental Raman spectroscopic techniques are highlighted.
Journal ArticleDOI
Advances in petascale kinetic plasma simulation with VPIC and Roadrunner
Kevin J. Bowers,Brian J. Albright,Lin Yin,William Daughton,Vadim Roytershteyn,B. Bergen,Thomas J. T. Kwan +6 more
TL;DR: In this paper, a 3D electromagnetic charge-conserving relativistic kinetic particle-in-cell code was adapted to run on Los Alamos's Roadrunner, the first supercomputer to break a petaflop (1015 floating point operations per second) in the TOP500 supercomputer performance rankings.
Journal ArticleDOI
Particle-in-cell simulations of laser?plasma interaction for the shock ignition scenario
TL;DR: In this article, numerical simulations of the laser pulse interaction with an inhomogeneous, large size, high temperature plasma were presented, where the authors demonstrated that after a short initial burst of backscattering, a significant part of the incident laser radiation is absorbed in the underdense plasma and the energy is transported to the dense plasma by electrons with energies 20 −40 keV.
Journal ArticleDOI
A review of laser?plasma interaction physics of indirect-drive fusion
R. K. Kirkwood,John Moody,John Kline,E. L. Dewald,S. H. Glenzer,Laurent Divol,Pierre Michel,Denise Hinkel,Richard Berger,E. A. Williams,Jose Milovich,Lin Yin,H. A. Rose,B. J. MacGowan,Otto Landen,M. D. Rosen,J. D. Lindl +16 more
TL;DR: The National Ignition Facility (NIF) has been designed, constructed and has recently begun operation to investigate the ignition of nuclear fusion with a laser with up to 1.8MJ of energy per pulse as discussed by the authors.
Proceedings ArticleDOI
0.374 Pflop/s trillion-particle kinetic modeling of laser plasma interaction on Roadrunner
TL;DR: The outstanding performance and scalability of the VPIC kinetic plasma modeling code on the heterogeneous IBM Roadrunner supercomputer at Los Alamos National Laboratory is demonstrated and opens up the exciting possibility of using VPIC to model, from first-principles, an issue critical to the success of the multi-billion dollar DOE/NNSA National Ignition Facility.
References
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