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X-ray spectroscopy of buried layer foils irradiated at laser intensities in excess of
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View: Figures


Image of FIG. 1.
FIG. 1.

The diagram shows the configuration of the buried layer target. The silver side of the target was irradiated with the short pulse laser. The HOPG spectrometer viewed the interaction from the front side.

Image of FIG. 2.
FIG. 2.

Lineouts taken from exposed image plate of copper spectra from the series of five targets. Spectra are identified by the thickness of the silver layer to reflect the location of the copper fluor in the target. The silver layer was varied to understand the extent of longitudinal nonuniformity of temperature.

Image of FIG. 3.
FIG. 3.

Sensitivity analysis showing the effect of ±300 eV variation in thermal temperature on the spectra. The experimental spectrum corresponds to the target with copper buried at 0.75 mm from the surface.

Image of FIG. 4.
FIG. 4.

Li-like and He-like lines from a copper plasma at 2100 eV, solid density, with opacity (a) and without opacity (b) incorporated into the spectral calculation.

Image of FIG. 5.
FIG. 5.

A series of curves showing how the specific fraction of hot electrons affects the He-alpha lines in an 800 eV, solid density plasma.

Image of FIG. 6.
FIG. 6.

The curve illustrates the relationship between hot electron fraction and thermal temperature that would produce a best fit to the experimentally measured He-like lines.

Image of FIG. 7.
FIG. 7.

Simulations were performed to show the effects of self-absorption. (a) shows a comparison where the escape factor treatment in the code FLYCHK is turned “off” and (b), with escape factor formulism, the effect of differing thicknesses of plasma, 0.4 and 0.04 mm, is shown. Both escape factor and optical depth have significant influence on the structure of spectra.

Image of FIG. 8.
FIG. 8.

The results of a multiple zone representation of a finite size plasma and performing ray tracing to bring the radiation emitted to the surface. Every zone has a thermal temperature of 2100 eV at solid density. For an optically thick plasma, using several smaller zones will decrease the amount of self-absorption without zone coupling resulting erroneously in the optically thin spectra.

Image of FIG. 9.
FIG. 9.

(a) shows resulting spectra from a cooling plasma with initial temperature of 2300 eV and solid density. Spectra are then integrated in time and compared to the case in (b). The same was one with a plasma with initial temperature of 1300 eV and solid density, only this iteration, 1% hot electrons was factored into the spectral calculation. The resulting spectra are shown in (c) and spectra integrated in time are shown in (d).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: X-ray spectroscopy of buried layer foils irradiated at laser intensities in excess of 1020 W/cm2