Publications associated with High Energy Density Physics and Inertial Fusion Energy

Direct observation of stimulated-Brillouin-scattering detuning by a velocity gradient.

Phys Rev Lett 90 (2003) 155003-

DH Froula, L Divol, A MacKinnon, G Gregori, SH Glenzer

We report the first direct evidence of detuning of stimulated Brillouin scattering (SBS) by a velocity gradient, which was achieved by directly measuring the frequency shift of the SBS-driven acoustic wave relative to the local resonant acoustic frequency. We show that in the expanding part of the plasma, ion-acoustic waves are driven off resonance which leads to the saturation of the SBS instability. These measurements are well reproduced by fluid simulations that include the measured flow.

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