Flash x radiography of laser-accelerated targets
Flash x radiography of ablatively accelerated planar foils has provided quantitative measurements and qualitative observations regarding several parameters of critical interest to direct illumination laser fusion. A 1.05 micron, 3.3 nsec driver beam was focused onto carbon foils in a large (0.7-1 mm diameter) spot to reduce edge effects. From images produced by a backlighting x-ray flash, we have measured overall coupling efficiency, smoothing of laser nonuniformities, target velocity, and ablation pressure. The high velocity targets maintain a localized, high density (> 3% of solid). In contrast to other workers' recent measurement of pressure from x-ray imaging, our x-radiographic results, including pressure, are in general agreement with earlier NRL studies. Our results have also provided further insights into double foil interactions and planar target preheat measurements.
- Research Organization:
- Naval Research Lab., Washington, DC (USA)
- DOE Contract Number:
- AI08-79DP40092
- OSTI ID:
- 6876702
- Report Number(s):
- NRL-MR-4860; ON: DE82022213; TRN: 82-024366
- Country of Publication:
- United States
- Language:
- English
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Flash x radiography of laser-accelerated foils
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