Direct observation of the saturation of stimulated Brillouin scattering by ion-trapping-induced frequency shifts
Physical Review Letters 93:3 (2004)
Abstract:
The measurement of the saturation of stimulated Brillouin scattering (SBS) by an ion-trapping-induced frequency shift was investigated. It was achieved by directly measuring the amplitude and absolute frequency of SBS-driven ion-acoustic waves (IAW). A frequency of up to 30% was observed along with a saturation of driven SBS and IAW reflectivity. The fast 30 ps oscillations of the SBS-driven IAW amplitude induced by the frequency shift were also measured.Direct observation of the saturation of stimulated Brillouin scattering by ion-trapping-induced frequency shifts.
Phys Rev Lett 93:3 (2004) 035001
Abstract:
We report the first measurement of the saturation of stimulated Brillouin scattering (SBS) by an ion-trapping-induced frequency shift, which was achieved by directly measuring the amplitude and absolute frequency of SBS-driven ion-acoustic waves (IAW). A frequency shift of up to 30% and a simultaneous saturation of driven IAW and SBS reflectivity were observed. The scaling of the frequency shift with the IAW amplitude compares well with theoretical calculations. We have further measured fast 30 ps oscillations of the SBS-driven IAW amplitude induced by the frequency shift.Effect of Nonlocal Transport on Heat-Wave Propagation
Physical Review Letters 92:20 (2004) 205006 (4 pages)
Electronic structure measurements of dense plasmas
PHYS PLASMAS 11:5 (2004) 2754-2762
Abstract:
This paper presents an improved analytical expression for the x-ray dynamic structure factor from a dense plasma which includes the effects of weakly bound electrons. This result can be applied to describe scattering from low to moderate Z plasmas, and it covers the entire range of plasma conditions that can be found in inertial confinement fusion experiments, from ideal to degenerate up to moderately coupled systems. The theory is used to interpret x-ray scattering experiments from solid density carbon plasmas and to extract accurate measurements of electron temperature, electron density, and charge state. The experimental results are applied to validate various equation-of-state models for carbon plasmas. (C) 2004 American Institute of Physics.Efficient multi-keV x-ray sources from Ti-doped aerogel targets
AIP CONF PROC 730 (2004) 223-232