J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 253-257
Particle-in-cell studies of laser-driven hot spots and a statistical model for mesoscopic properties of Raman backscatterB.J. Albright1, W. Daughton2, L. Yin1, K.J. Bowers1, J.L. Kline1, D.S. Montgomery1 and J.C. Fernández1
1 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2 Dept. of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA
The authors use explicit particle-in-cell simulations to model stimulated scattering processes in media with both solitary and multiple laser hot spots. These simulations indicate coupling among hot spots, whereby scattered light, plasma waves, and hot electrons generated in one laser hot spot may propagate to neighboring hot spots, which can be destabilized to enhanced backscatter. A nonlinear statistical model of a stochastic beam exhibiting this coupled behavior is described here. Calibration of the model using particle-in-cell simulations is performed, and a threshold is derived for "detonation" of the beam to high reflectivity.
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