J. Phys. IV France
Volume 133, June 2006
Page(s) 253 - 257
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 253-257

DOI: 10.1051/jp4:2006133051

Particle-in-cell studies of laser-driven hot spots and a statistical model for mesoscopic properties of Raman backscatter

B.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.

© EDP Sciences 2006