Experimental Investigation of Coronal Plasma Conditions in Direct-Drive ICF Using Time-Resolved X-Ray Spectroscopy
Abstract
The ne and Te of planar plasmas generated with six beams of the OMEGA laser are diagnosed with time-resolved K-shell spectroscopy of microdot tracer layers. Plastic foils (125 μm thick) with buried microdots (Al, KCl) were irradiated with a high-intensity, 100-ps Gaussian pulse (5 × 10^14 W/cm^2) or a low-intensity (3 × 10^13 W/cm^2), 1-ns square pulse, corresponding to the initial stages of direct-drive implosions with and without a short, high-intensity picket at the beginning of the drive pulse. The microdot buried depth was varied (0.1 to 0.5 μm) to probe the plasma at different times. Simulated spectra generated by post-processing hydrocode output (1-D LILAC, 2-D SAGE) with the FLY atomic physics code will be compared with the measured spectra. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC03-92SF19460.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2003
- Bibcode:
- 2003APS..DPPLO2003S