Study of SRS and SBS from NOVA Targets Using the Axial Imager

Physics – Plasma Physics

Scientific paper

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Scientific paper

Time-resolved images of SRS and SBS, looking down the axis of NOVA hohlraum targets, have been collected and analyzed. Images have resolution of smaller than 10 microns, with depth of field between 0.5 and 1.0 mm. Time resolution varies between integrated time steps of 0.3 ns to 0.5 ns. Monitoring SRS, the evolution of different plasma density regions has been followed with integrated time steps of approximately 0.3 ns. Evidence of effects due to window ablation and target wall ablation and expansion have been observed. Images have been compared to the expected plasma density and temperatures from modeling of the hohlraum targets. Monitoring SBS, evidence of scattering from regions smaller than 25 microns in diameter has been observed. Asymmetries in images also give an indication of beam steering.

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